The following dipeptide is called:

Punjab Mock 4
Chemistry
Carboxylic Acids and its Derivatives
A) Glycyl glycine
Show Explanation
B) Glycyl alanine
Show Explanation
C) Alaninyl alanine
Show Explanation
D) Alaninyl glycine
Show Explanation

The Kc has following units for the reaction H2(g) + I2(g) ⇋ 2HI (g)

Punjab Mock 4
Chemistry
Chemical Equilibrium
A) mol3dm-6
Show Explanation
B) moldm-3
Show Explanation
C) mol-3dm6
Show Explanation
D) No unit
Show Explanation

Alanine is an aminoacid which showsneutral effect on litmus paper,the formula of alanine may be

Punjab Mock 4
Chemistry
Carboxylic Acids and its Derivatives
A) A
Show Explanation
B) B
Show Explanation
C) C
Show Explanation
D) D
Show Explanation

Primary, secondary and tertiary alcohols can be identified and distinguished by

Punjab Mock 4
Chemistry
Alcohol, Phenols, and Ethers
A) Lucas test
Show Explanation
B) Iodoform test
Show Explanation
C) Baeyer’s test
Show Explanation
D) Silver mirror test
Show Explanation

Which of the following structures is not an alpha amino acid?

Punjab Mock 4
Chemistry
Carboxylic Acids and its Derivatives
A) A
Show Explanation
B) B
Show Explanation
C) C
Show Explanation
D) D
Show Explanation

Sublimation is used to purify

UHS 2010
Chemistry
A) Ammonium sulphate
Show Explanation
B) Sodium chloride
Show Explanation
C) Benzoic acid
Show Explanation
D) Lead carbonate
Show Explanation

In basic conditions, amino acid exists in which of the following forms?

Punjab Mock 4
Chemistry
Carboxylic Acids and its Derivatives
A) A
Show Explanation
B) B
Show Explanation
C) C
Show Explanation
D) D

Which one of the following alcohol is indicated by formation of yellow crystals in the
Iodoform test?

Punjab Mock 4
Chemistry
Alcohol, Phenols, and Ethers
A) MethanoL
Show Explanation
B) Ethanol
Show Explanation
C) Butanol
Show Explanation
D) Propanol
Show Explanatio

The skeletal formula of dipeptide formed between aspartic acid and phenylalanine is given below: How many functional groups are present in its formula?

Punjab Mock 4
Chemistry
Carboxylic Acids and its Derivatives
A) 5
Show Explanation
B) 2
Show Explanation
C) 4
Show Explanation
D) 3
Show Explanation

In the structure of NaCl, each Na+ is surrounded by _____ Cl- ions.

Punjab Mock 4
Chemistry
States of Matter – Gases, Liquids and Solids
A) Four
Show Explanation
B) Eight
Show Explanation
C) Five
Show Explanation
D) Six
Show Explanation

Which one of the following is the correct chemical reaction for Ammonia formation
by Haber process?

Punjab Mock 4
Chemistry
Chemical Equilibrium
A) N2(g) + H2(g) ⇌ 2NH(g)
Show Explanation
B) 2N(g) + 3H2(g) ⇌ NH3(g)
Show Explanation
C) 2N(g) + 3H2(g) ⇌ 2NH3(g)
Show Explanation
D) N2(g) + 3H2(g) ⇌ 2NH3(g)

Show Explanation

Which one of the following molecules has zero dipole moment?

Punjab Mock 4
Chemistry
Chemical Bonding
A) NH3
Show Explanation
B) CHCl3
Show Explanation
C) BF3
Show Explanation
D) H2O
Show Explanation

A sample of Neon is found to exist as 20Ne, 21Ne, 22Ne. Mass spectrum of ‘Ne’ is as follows:

What is the relative atomic mass (Ar value) of Neon?

Punjab Mock 4
Chemistry
Stoichiometry
Mole
A) 20.18
Show Explanation
B) 20.28
Show Explanation
C) 20.10
Show Explanation
D) 20.22
Show Explanation

The angle between unhybridized p-orbital and three sp2 hybrid orbitals of each carbon atom in ethene is

Punjab Mock 4
Chemistry
Chemical Bonding
VSEPR Theory
A) 120°
Show Explanation
B) 90°
Show Explanation
C) 109.5°

Show Explanation
D) 180°
Show Explanation

Macromolecules are described as large molecules built up from small repeating units called:

Punjab Mock 4
Chemistry
Macromolecules
A) Monomers
Show Explanation
B) Isomers
Show Explanation
C) Metamers
Show Explanation
D) Tautomers
Show Explanation

The percentage of carbon in different types of iron products is in the order of

UHS 2014
Chemistry
d and f Block Elements
A) Cast Iron > Wrought Iron > Steel
Show Explanation
B) Wrought Iron > Steel > Cast Iron
Show Explanation
C) Cast Iron > Steel > Wrought Iron
Show Explanation
D) Cast Iron > Steel > Wrought Iron
Show Explanation

The purity of a substance can be identified by

UHS 2010
Chemistry
A) Sublimation
Show Explanation
B) Filtration
Show Explanation
C) Chromatography
Show Explanation
D) Solvent extraction
Show Explanation

When 8 grams (4 moles) of H2 react with 2 moles of O2 , how many moles of water will be formed?

Punjab Mock 4
Chemistry
Stoichiometry
Mole
A) 5
Show Explanation
B) 4
Show Explanation
C) 6
Show Explanation
D) 3
Show Explanation

Which type of force is present in gasoline?

Punjab Mock 4
Chemistry
Chemical Bonding
A) Dipole-dipole forces
Show Explanation
B) Dipole-induced dipole forces
Show Explanation
C) London dispersion forces
Show Explanation
D) Hydrogen bonding
Show Explanation

The pH of acid rain is

UHS 2014
Chemistry
Environmental Chemistry
Factors affecting Water Quality
Introduction and Types of Pollution
A) 7
Show Explanation
B) Between 5 and 7
Show Explanation
C) Below 5
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D) Between 7 and 14
Show Explanation

Starch is a polymer of:

Punjab Mock 4
Chemistry
Macromolecules
A) β–D–glucose
Show Explanation
B) α––glucose
Show Explanation
C) γ–D–glucose
Show Explanation
D) α–L–glucose
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The principal energy storage carbohydrate in animals is:

Punjab Mock 4
Chemistry
Macromolecules
A) Glucose
Show Explanation
B) Starch
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C) Protein
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D) Glycogen

Which one of the following is the correct equation of 1st ionization of sulphuric acid?

Punjab Mock 4
Chemistry
Chemical Bonding
A) H2SO4(aq) + H2O(l) –> 2H+ + SO42-
Show Explanation
B) H2SO4(aq) + H2O(l) –> H+(aq) + HSO4-
Show Explanation
C) H2SO4(aq) + H2O(l) –> 2H+ + SO42-
Show Explanation
D) H2SO4(aq) + H2O(l) –> H3O+ + SO42-
Show Explanation

Ethyl butyrate and butyl butanoate are esters with the flavor of:

Punjab Mock 4
Chemistry
Carboxylic Acids and its Derivatives
A) Pear
Show Explanation
B) Banana
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C) Pineapple
Show Explanation
D) Apple
Show Explanation

If we are given the mass of one substance, we can calculate volume of other substances and vice a versa with the help of balanced chemical equation. This is called

Punjab Mock 4
Chemistry
Introduction to Fundamental Concepts of Chemistry
A) Mass-mass relationship
Show Explanation
B) Mass-mole relationship
Show Explanation
C) Mole-volume relationship
Show Explanation
D) Mass-volume relationship
Show Explanation

‘∆H’ will be given a negative sign in

Punjab Mock 4
Chemistry
Thermochemistry
Laws of Thermodynamics
A) Exothermic reactions

Show Explanation
B) Decomposition reactions
Show Explanation
C) Dissociation reaction
Show Explanation
D) Endothermic reactions
Show Explanation

In ‘H-F’ bond electronegativity difference is ‘1.9’. What is the type of this bond?

Punjab Mock 4
Chemistry
Chemical Bonding
Electron Affinity and Electronegativity
Covalent Bond
A) Polar covalent bond
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B) Non-polar covalent bond
Show Explanation
C) Pi (π) bond
Show Explanation
D) Co-ordinate covalent bond
Show Explanation

Which one of the following groups is indicated when HCl is formed by reaction of
ethanol with phosphorus pentachloride

Punjab Mock 4
Chemistry
Alcohol, Phenols, and Ethers
A) Amino group
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B) Hydroxyl group
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C) Halide group
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D) Hydride group
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Which one of the following products is obtained when sulphur trioxide is absorbed in
concentrated sulphuric acid?

Punjab Mock 4
Chemistry
Chemical Equilibrium
State of Chemical Equilibrium
A) Oleum
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B) Aqua Regia
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C) Hydrogen sulphide
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D) Sulphate ion
Show Explanation

The structural formula of the product of reaction of acetone with 2,4-dinitrophenyl
hydrazine is:

Punjab Mock 4
Chemistry
Aldehydes and Ketones
Reactivity and Reactions of Carbonyl Group
A) A
Show Explanation
B) B
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C) C
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D) D

If halogenoalkanes are mixed with an excess of ethanoic ammonia and heated under pressure, amine are formed. Which amine is formed in the following reaction?
CH2CH3Br + NH3 Amine

Punjab Mock 4
Chemistry
Alkyl Halides and Amines
Introduction to Alkyl Halides and Amines
A) CH3―CH2―NH―CH2―CH3
Show Explanation
B) CH3―CH2―NH2
Show Explanation
C) CH3―CH2―CH2―NH2
Show Explanation
D) H2N―CH2―CH2―NH2
Show Explanation

The relative energies of 4s, 4p and 3d orbitals are in the order:

Punjab Mock 4
Chemistry
Atomic Structure
Sub Atomic Particles and Their Discoveries
A) 3d < 4p <4s Show Explanation B) 4s < 3d < 4p Show Explanation C) 4p < 4s < 3d Show Explanation D) 4p < 3d < 4s Show Explanation

Solubility of Ce2(SO4)3

Punjab Mock 4
Chemistry
Chemical Equilibrium
A) Increases with temperature
Show Explanation
B) Decreases with temperature
Show Explanation
C) Shows exceptional behavior
Show Explanation
D) Remains constant
Show Explanation

With the increase in the value of Principal Quantum Number ‘n’, the shape of the s-orbitals remains the same although their sizes

Punjab Mock 4
Chemistry
Atomic Structure
Plancks Quantum Theory
A) Decrease
Show Explanation
B) Increase
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C) Remain the same
Show Explanation
D) May or may not remain the same
Show Explanation

A student mixed ethyl alcohol with a small amount of sodium dichromate and added it to the hot solution of dilute sulphuric acid. A vigorous reaction took place. He distilled the product formed immediately. What was the product?

Punjab Mock 4
Chemistry
Aldehydes and Ketones
Reactivity and Reactions of Carbonyl Group
A) Acetone
Show Explanation
B) Acetic acid
Show Explanation
C) Dimethyl ether
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D) Acetaldehyde
Show Explanation

The standard enthalpy of solution of NH4Cl is ____________ kJmol-1.

Punjab Mock 4
Chemistry
Thermochemistry
A) +16.2
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B) -25.0
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C) +4.98
Show Explanation
D) +26.0
Show Explanation

Plasma is the ionized gas mixture which consists of:

Punjab Mock 4
Chemistry
States of Matter – Gases, Liquids and Solids
A) Ions and electrons
Show Explanation
B) Electrons and neutral atoms
Show Explanation
C) Electrons, ions and neutral atoms
Show Explanation
D) Ions and neutral atoms
Show Explanation

When ethanoic acid reacts with methylamine, an amide is formed. What is the structure of the amide formed?

Punjab Mock 4
Chemistry
Alkyl Halides and Amines
Introduction to Alkyl Halides and Amines
A) A
Show Explanation
B) B
Show Explanation
C) C
Show Explanation
D) D
Show Explanation

The inter-ionic distance in a crystal lattice of KCl is

Punjab Mock 4
Chemistry
States of Matter – Gases, Liquids and Solids
A) 314 pm
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B) 181 pm
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C) 95 pm
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D) 300 pm
Show Explanation

The reaction between fats and caustic soda is called:

Punjab Mock 4
Chemistry
Macromolecules
A) Hydrogenolysis
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B) Fermentation
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C) Esterification
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D) Saponification
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The formula of 2, 4, 6-tribromo phenol is

Punjab Mock 4
Chemistry
Alcohol, Phenols, and Ethers
A) A
Show Explanation
B) B
Show Explanation
C) C
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D) D

Which one of the following noble gases are used for providing an inert atmosphere for welding?

Punjab Mock 4
Chemistry
s and p Block Elements
Introduction to s and p Block Elements
A) Helium
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B) Neon
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C) Argon
Show Explanation
D) Krypton
Show Explanation

An organic compound has the empirical formula C3H3O if the molar mass of the compound is 110.15 g.mol-1. The molecular formula of this organic compound is: (A, of C=12, H=1.008
and O=16)

Punjab Mock 4
Chemistry
Stoichiometry
Mole
A) C6H6O2
Show Explanation
B) C3H3O
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C) C9H9O3
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D) C6H6O3
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The number of bonds in nitrogen molecule is

Punjab Mock 4
Chemistry
Chemical Bonding
A) One σ and two π
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B) One σ and one π
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C) Three σ only
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D) Two σ and one π
Show Explanation

Electronic configuration of Manganese (Mn) is

Punjab Mock 4
Chemistry
d and f Block Elements
A) A
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B) B
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C) C
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D) D
Show Explanation

Correct order of boiling points of the given liquids is:

Punjab Mock 4
Chemistry
States of Matter – Gases, Liquids and Solids
Boiling Point and Vapor Pressure
A) H2O > HF > HCl > NH3
Show Explanation
B) HF > H2O > HCl > NH3
Show Explanation
C) H2O > HF > NH3 > HCl

Show Explanation
D) HF > H2O > NH3 > HCl
Show Explanation

The number of molecules in 22.4 dm3 of H2 gas at 0 °C and 1 atm are

Punjab Mock 4
Chemistry
Stoichiometry
Mole
A) 60.2 x 10^23
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B) 6.02 x 1022
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C) 6.02 x 1025
Show Explanation
D) 6.02 x 1023
Show Explanation

Which one of the following mathematical expressions represents the Avogadro’s law?

Punjab Mock 4
Chemistry
States of Matter – Gases, Liquids and Solids
A) Option A
Show Explanation
B) Option B
Show Explanation
C) Option C
Show Explanation
D) Option D
Show Explanation

The root mean square velocity of gases is inversely proportional to the square root of their:

Punjab Mock 4
Chemistry
States of Matter – Gases, Liquids and Solids
A) Molar mass
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B) Temperature
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C) Pressure
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D) Volume
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Which one is the highest power multiple?

Punjab Mock 4
Physics
A) Giga
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B) Tera
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C) Mega
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D) Deca
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A spontaneous process is

Punjab Mock 4
Chemistry
Thermochemistry
A) Unidirectional and irreversible
Show Explanation
B) Irreversible and a real process
Show Explanation
C) Unidirectional and a real process
Show Explanation
D) All of the above
Show Explanation

Organic compound containing both amino and carboxyl group is known as:

Punjab Mock 4
Chemistry
Carboxylic Acids and its Derivatives
A) Amino acid
Show Explanation
B) Fatty acid
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C) Saccharide
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D) Amide
Show Explanation

Which one of the following pair of compounds is cis and trans isomers of each
other?

Punjab Mock 4
Chemistry
Hydrocarbons
Introduction to Hydrocarbons
A) A
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B) B
Show Explanation
C) C
Show Explanation
D) D
Show Explanation

The disease which causes immobility and fusion of vertebral joints is:

Punjab Mock 4
Biology
Support and Movement
A) Osteomalacia (soft bones)
Show Explanation
B) Disc slip
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C) Arthritis
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D) Spondylosis
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A neurological condition characterised by involuntary tremors, diminished motor activity and rigidity is called

Punjab Mock 4
Biology
Coordination and Control
Disorders of the Nervous System
A) Epilepsy
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B) Parkinson’s Disease
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C) Alzheimer’s Disease
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D) Cerebellar Tumours
Show Explanation

Granulocytes or white blood cells are produced in:

Punjab Mock 4
Biology
Transport
A) Lymph nodes
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B) Red bone marrow
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C) Tonsils
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D) Spleen
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Beri Beri is due to.

Punjab Mock 4
Biology
Man and His Enviornment
A) Metabolic disorder
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B) Chemical causes
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C) Nutritional deficiency
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D) Mental Illness
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_____ is activated to_____ by Enterokinase/enteropeptidase enzyme secreted by the lining of duodenum:

Punjab Mock 4
Biology
Nutrition
Digestion and Absorption
A) Pepsinogen, Pepsin
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B) Pepsinogen, Trypsin
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C) Trypsinogen, Trypsin
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D) Chymotrypsinogen, Chymotrypsin
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Type of respiration which involves step by step breakdown of carbon chain molecules in the cell is called:

Punjab Mock 4
Biology
Gaseous Exchange
A) External respiration
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B) Cellular respiration
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C) Pulmonary respiration
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D) Cutaneous respiration
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Which one of the following acts as functional unit of lungs in man?

Punjab Mock 4
Biology
Gaseous Exchange
A) Air sac
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B) Trachea
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C) Larynx
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D) Bronchioles
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The view that active site of an enzyme is flexible and when a substrate combines with it, cause changes in enzyme structure is known as:

Punjab Mock 4
Biology
A) Lock & key model
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B) Induce fit model
Show Explanation
C) Sliding filament model
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D) Specificity model
Show Explanation

Breakdown of endometrium during menstruation is due to

Punjab Mock 4
Biology
Reproduction
Reproduction in Females
A) Increase in Level of LH
Show Explanation
B) Decrease in Level of Progesterone
Show Explanation
C) Increase in Level of Progesterone
Show Explanation
D) Increase in Level of Oestrogen
Show Explanation

The enzymes of lysosomes are synthesized on:

Punjab Mock 4
Biology
Cell Structure and Function
Cytoplasm and Organelles
A) Rough Endoplasmic Reticulum
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B) Smooth Endoplasmic Reticulum
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C) Chloroplast
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D) Golgi apparatus
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Instrument which is used to measure relative abilities of different pigments to absorb different wavelengths of light is called:

Punjab Mock 4
Biology
Bioenergetics
A) Spectrometer
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B) Photometer
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C) Barometer
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D) Spectrophotometer
Show Explanation

Krebs cycle takes place in

Punjab Mock 4
Biology
Bioenergetics
Respiration Mechanism – Glycolysis to Electron Transport Chain
A) Ribosomes
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B) Golgi apparatus
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C) Mitochondria
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D) Endoplasmic Reticulum
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The process by which unwanted structures within the cell are engulfed and digested within the lysosome is known as:

Punjab Mock 4
Biology
Cell Structure and Function
Cytoplasm and Organelles
A) Endocytosis
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B) Exocytosis
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C) Hydrolysis
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D) Autophagy
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Which of the following is a keto sugar:

Punjab Mock 4
Biology
Biological Molecules
Carbohydrates
A) Glyceraldehyde
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B) Dihydroxy-acetone
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C) Ribose
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D) Glucose
Show Explanation

The entire cell wall of bacteria is often regarded as a single huge molecule or molecular complex called

Punjab Mock 4
Biology
Kingdom Prokaryote
Size and Structure of Bacteria
A) Capsule
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B) Secondary wall
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C) Slime capsule
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D) Sacculus
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The flow of lymph in lymphatic vessels is maintained by:

Punjab Mock 4
Biology
Transport
A) Heart, activity of smooth muscles and valves
Show Explanation
B) Activity of skeletal muscles, heart and breathing movements
Show Explanation
C) Breathing movements, activity of skeletal muscles and valves
Show Explanation
D) Exercise, breathing movements and heart
Show Explanation

The central metabolic station and clearing house of a body is:

Punjab Mock 4
Biology
Homeostasis
A) Liver
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B) Kidney
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C) Nephron
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D) Glomerulus
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Which one of the following is a precursor of steroid hormones?

Punjab Mock 4
Biology
Biological Molecules
A) Glycerol
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B) Sterol
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C) Amino acids
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D) Cholesterol
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The living cells of cartilage are called:

Punjab Mock 4
Biology
Support and Movement
A) Chrondrocytes
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B) Osteoblasts
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C) Ostecytes
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D) Osteoclasts
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Which of the following is exclusive character of mammals?

Punjab Mock 4
Biology
Kingdom Animalia
Phylums – porifera to chordata
A) Homeothermic
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B) Hair
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C) Poikliothermic
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D) Four chambered heart
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An activated enzyme consisting of polypeptide and a cofactor is known as

Punjab Mock 4
Biology
A) Amylase
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B) Apoenzyme
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C) Holoenzyme
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D) Coenzyme
Show Explanation

Which structures respond when they are stimulated by impulse coming through the motor neuron?

Punjab Mock 4
Biology
Coordination and Control
Steps Involved in Nervous Coordination
A) Receptors
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B) Responses
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C) Effectors
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D) Transduction
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The muscles that control urine in bladder are known as:

Punjab Mock 4
Biology
Support and Movement
A) Striated muscles
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B) Smooth muscles
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C) Sphincter muscles
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D) Circular muscles
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The layer which forms the lining of digestive tract and glands of digestive system is:

Punjab Mock 4
Biology
Kingdom Animalia
Classification according to Coelem
A) Ectoderm
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B) Mesoderm
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C) Endoderm
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D) Mesoglea
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Reverse transcription is used to make DNA copies of:

Punjab Mock 4
Biology
Bio-diversity | Variety of Life
A) Host RNA
Show Explanation
B) Viral RNA
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C) Host DNA
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D) Viral DNA
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Overactivity of sympathetic nervous system causes

Punjab Mock 4
Biology
Coordination and Control
Coordination in Animals
A) Disturbance of Vision
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B) Constipation
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C) Decrease in Blood Pressure
Show Explanation
D) Increase in Heart Rate
Show Explanation

Which of the following is purine:

Punjab Mock 4
Biology
Biological Molecules
Nucleic Acid
A) Guanine
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B) Cytosine
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C) Thiamine
Show Explanation
D) Uracil
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The cavity between body wall and alimentary canal is:

Punjab Mock 4
Biology
Kingdom Animalia
Classification according to Coelem
A) Coelom
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B) Mesoderm
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C) Endoderm
Show Explanation
D) Mesoglea
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Acyl-glycerols like fats and oils are esters formed by condensation reaction between:

Punjab Mock 4
Biology
Biological Molecules
Lipids
A) Fatty acids and water
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B) Fatty acids and alcohols
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C) Fatty acids and glucose
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D) Fatty acids and phosphates
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If the co-factor is covalently or tightly and permanently bonded to enzyme then it will be called:

Punjab Mock 4
Biology
A) Coenzyme
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B) Prosthetic group
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C) Activator
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D) Apoenzyme
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Optimum pH value for the working of pancreatic lipase is:

Punjab Mock 4
Biology
A) 4.50
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B) 7.60
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C) 2.00
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D) 9.00
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Bacterial ‘death rate’ is equal to ‘birth rate; in

Punjab Mock 4
Biology
Kingdom Prokaryote
Growth and Reproduction in Bacteria
A) Lag phase
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B) Log phase
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C) Death phase
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D) Stationary phase
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End products of yeast fermentation, bacterial fermentation and anaerobic respiration are:

Punjab Mock 4
Biology
Bioenergetics
A) Citric acid, lactic acid, carbon dioxide and water
Show Explanation
B) Ethyl alcohol, citric acid and carbon dioxide
Show Explanation
C) Ethyl alcohol, lactic acid, carbon dioxide and water
Show Explanation
D) Methanol, lactic acid and citric acid
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Amino acid in which the R-group is hydrogen is:

Punjab Mock 4
Biology
Biological Molecules
Proteins
A) Glycine
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B) Alanine
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C) Leucine
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D) Valine
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Widespread epidemic disease, influenza is caused by:

Punjab Mock 4
Biology
Bio-diversity | Variety of Life
A) DNA virus
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B) RNA enveloped virus
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C) DNA enveloped virus
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D) RNA virus
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Hormones are the organic compounds of varying structural complexity. Which of the following is not a function or property of these compounds?

Punjab Mock 4
Biology
Coordination and Control
Endocrine System and its Hormones
A) They initiate new biochemical reactions
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B) They are poured directly into blood
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C) They may be proteins
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D) They affect target cells
Show Explanation

The _______ model of plasma membrane suggests that proteins are embedded in lipid bilayer:

Punjab Mock 4
Biology
Cell Structure and Function
Plasma Membrane
A) Unit membrane
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B) Fluid mosaic
Show Explanation
C) Permeable
Show Explanation
D) Ultracentrifuge
Show Explanation

An association between two organisms benefiting both is called

Punjab Mock 4
Biology
Kingdom Fungi
A) Commensalism
Show Explanation
B) Parasitism
Show Explanation
C) Predation
Show Explanation
D) Symbiosis
Show Explanation

______ is most abundant carbohydrate in nature.

Punjab Mock 4
Biology
Biological Molecules
Carbohydrates
A) Waxes
Show Explanation
B) Glycerol
Show Explanation
C) Starch
Show Explanation
D) Cellulose
Show Explanation

Metabolic waste from metabolism of nucleic acid is:

Punjab Mock 4
Biology
A) Uric acid
Show Explanation
B) Creatine
Show Explanation
C) Urea
Show Explanation
D) Creatinine
Show Explanation

Which one of the following statements best describes the function of sinoatrial node?

Punjab Mock 4
Biology
Transport
A) It sends out electrical impulses to atrial muscles causing both atria to contract.
Show Explanation
B) It consists of small number of diffusely oriented cardiac fibres
Show Explanation
C) It sends out electrical impulses to ventricular muscles causing both ventricles to contract
Show Explanation
D) It is present at upper end of left atrium.
Show Explanation

The simplest independent unit of life is known as:

Punjab Mock 4
Biology
Cell Structure and Function
Introduction to Cell and it’s theory
A) Bacterial colony
Show Explanation
B) Cell
Show Explanation
C) Chloroplast
Show Explanation
D) DNA
Show Explanation

During muscle contraction:

Punjab Mock 4
Biology
Support and Movement
A) I-band shortens
Show Explanation
B) Myosin filaments shorten
Show Explanation
C) Actin filaments shorten
Show Explanation
D) Z-line disappears
Show Explanation

The term which is employed to the loss of appetite due to fear of becoming obese is:

Punjab Mock 4
Biology
Nutrition
A) Obesity
Show Explanation
B) Anorexia nervosa
Show Explanation
C) Dyspepsia
Show Explanation
D) Bulimia nervosa
Show Explanation

Where is the ileocolic sphincter located in your body?

Punjab Mock 4
Biology
Nutrition
Digestion and Absorption
A) At the junction of esophagus and stomach
Show Explanation
B) At the junction of stomach and small intestine
Show Explanation
C) At the junction of ileum and large intestine
Show Explanation
D) At the junction of small intestine and large intestine
Show Explanation

Respiratory centre is located in

Punjab Mock 4
Biology
Coordination and Control
A) Cerebrum
Show Explanation
B) Cerebellum
Show Explanation
C) Medulla
Show Explanation
D) Hypothalamus
Show Explanation

Expiration in human beings is carried out by:

Punjab Mock 4
Biology
Gaseous Exchange
A) Contraction of lungs
Show Explanation
B) Contraction of intercostal membrane
Show Explanation
C) Relaxation of intercostal and diaphragm muscles
Show Explanation
D) Contraction of diaphragm muscles
Show Explanation

Which one of the following vitamins is produced by microflora of large intestine?

Punjab Mock 4
Biology
Nutrition
Digestion and Absorption
A) Vitamin K
Show Explanation
B) Vitamin C
Show Explanation
C) Vitamin A
Show Explanation
D) Vitamin D
Show Explanation

When the division of cells is in three planes, the arrangement is known as

Punjab Mock 4
Biology
Kingdom Prokaryote
Size and Structure of Bacteria
A) Diplococcus
Show Explanation
B) Sarcina
Show Explanation
C) Streptococcus
Show Explanation
D) Staphylococcus
Show Explanation

The production of genetically identical copies of organisms by asexual reproduction is called:

Punjab Mock 4
Biology
Reproduction
Reproduction in Animals
A) Genetic engineering
Show Explanation
B) Integrated disease management
Show Explanation
C) Hydroponic culture technique
Show Explanation
D) Cloning
Show Explanation

Which of the following diseases can be prevented through vaccination?

Punjab Mock 4
Biology
Bio-diversity | Variety of Life
A) AIDS and Cancer
Show Explanation
B) Malaria and AIDS
Show Explanation
C) Typhoid and Cancer
Show Explanation
D) Measles and Mumps
Show Explanation

Fungi store surplus food in the form of

UHS 2010
Biology
Kingdom Fungi
Nutrition in Fungi
A) Cellulose
Show Explanation
B) Glycogen
Show Explanation
C) Starch
Show Explanation
D) Both B and C
Show Explanation

All coenzymes are derived from:

Punjab Mock 4
Biology
A) Proteins
Show Explanation
B) Nucleic acids
Show Explanation
C) Carbohydrates
Show Explanation
D) Vitamins
Show Explanation

Reflexes and instincts type of behaviours respond to which combination/s?

Punjab Mock 4
Biology
Coordination and Control
Nature and Types of Behaviour
A) Biological rhythms, territorial, courtship and development
Show Explanation
B) The responses that do produce same result in different conditions
Show Explanation
C) Aggression, mating and altruism
Show Explanation
D) The responses that are predetermined like differentiation.
Show Explanation

__________ forms weak linkages with enzymes and their effect can be neutralized completely or partly by an increase in the concentration of the substrate.

Punjab Mock 4
Biology
A) Only competitive Inhibitors
Show Explanation
B) Reversible inhibitors
Show Explanation
C) Irreversible inhibitors
Show Explanation
D) Both reversible and irreversible inhibitors
Show Explanation

A type of cell in human testes which produces testosterone is called:

Punjab Mock 4
Biology
Reproduction
Reproduction in Males
A) Interstitial Cells
Show Explanation
B) Germ Cells
Show Explanation
C) Sertoli Cells
Show Explanation
D) Spermatocytes
Show Explanation

In prokaryotic cell, wall strengthening material is

Punjab Mock 4
Biology
Cell Structure and Function
Prokaryotic and Eukaryotic Cells
A) Cellulose
Show Explanation
B) Silica
Show Explanation
C) Chitin
Show Explanation
D) Peptidoglycan
Show Explanation

In human beings, what is the function of amylase in digestion?

Punjab Mock 4
Biology
Nutrition
Digestion and Absorption
A) Digestion of triglycerides
Show Explanation
B) Digestion of lipids
Show Explanation
C) Digestion of all types of food
Show Explanation
D) Digestion of carbohydrates
Show Explanation

Which one of following factors is directly proportional to oxygen carrying capacity of haemoglobin:

Punjab Mock 4
Biology
Transport
A) Carbon dioxide
Show Explanation
B) Temperature
Show Explanation
C) pH
Show Explanation
D) Light
Show Explanation

Oogonia are produced in the germ cells of:

Punjab Mock 4
Biology
Reproduction
Reproduction in Females
A) Both Uterus and Cervix
Show Explanation
B) Cervix
Show Explanation
C) Uterus
Show Explanation
D) Ovary
Show Explanation

Trypanosoma is a human parasite causing

Punjab Mock 4
Biology
Kingdom Protista
Diversity and major groups of protista
Importance of Protists
A) African sleeping sickness
Show Explanation
B) European sleeping sickness
Show Explanation
C) Indonesian sleeping sickness
Show Explanation
D) American sleeping sickness
Show Explanation

Newly produced cells/individuals which are identical in each other are known as

Punjab Mock 4
Biology
Reproduction
Reproduction in Animals
A) Genetically Modified
Show Explanation
B) Transgenic Animals
Show Explanation
C) Transgenic Bacteria
Show Explanation
D) Clones
Show Explanation

Larvae of which group are similar to chordates?

Punjab Mock 4
Biology
Kingdom Animalia
Phylums – porifera to chordata
A) Echinodermata
Show Explanation
B) Annelida
Show Explanation
C) Arthropoda
Show Explanation
D) Nematoda
Show Explanation

Chemically, viruses are made up of

Punjab Mock 4
Biology
Bio-diversity | Variety of Life
A) Nucleic acid only
Show Explanation
B) Protein only
Show Explanation
C) Nucleic acid and protein
Show Explanation
D) Core and coat
Show Explanation

Which of the following bacteria have more lipids in their cell wall

Punjab Mock 4
Biology
Kingdom Prokaryote
Size and Structure of Bacteria
A) Gram positive bacteria have more lipids in their cell wall
Show Explanation
B) Gram negative bacteria have more lipids in their cell wall
Show Explanation
C) Lipids are absent in cell wall of both gram positive and negative bacteria
Show Explanation
D) Both have equal amount of lipids
Show Explanation

Lipid metabolism is the function of:

Punjab Mock 4
Biology
Cell Structure and Function
Cytoplasm and Organelles
A) Mitochondria
Show Explanation
B) Sarcoplasmic reticulum
Show Explanation
C) Rough Endoplasmic Reticulum
Show Explanation
D) Smooth Endoplasmic Reticulum
Show Explanation

The function of nucleolus is to make:

Punjab Mock 4
Biology
Cell Structure and Function
Cytoplasm and Organelles
A) rDNA
Show Explanation
B) Ribosomes
Show Explanation
C) RNA
Show Explanation
D) Chromosomes
Show Explanation

Book lungs are present in arthropods for exchange of gases in class:

Punjab Mock 4
Biology
Kingdom Animalia
Phylums – porifera to chordata
A) Crustacea
Show Explanation
B) Insecta
Show Explanation
C) Myriapoda
Show Explanation
D) Arachnida
Show Explanation

Statement: Should children be prevented completely from watching television?

Arguments:

(I) No. We get vital information regarding education through television.

(II) Yes. It hampers the study of children.

(Ill) Yes. Young children are misguided by certain programmes featuring violence.

Punjab Mock 4
Logical Reasoning
Critical Thinking
A) Only I, II and Ill are strong
Show Explanation
B) Only I is strong
Show Explanation
C) Only I and III are strong
Show Explanation
D) Only I and II are strong
Show Explanation

From the following which word does not belong to the others:

Punjab Mock 4
Logical Reasoning
Critical Thinking
A) Index
Show Explanation
B) Book
Show Explanation
C) Glossary
Show Explanation
D) Chapter
Show Explanation

Statement:
Should coal engines be replaced by electric engines in trains?

Arguments:
(I) Yes. Coal engines cause a lot of pollution.
(II) Yes. Electric engines are good on performance, easy to operate, and low on maintenance.
(III) No. Pakistan does not produce enough electricity to fulfill its domestic needs also.

Punjab Mock 4
Logical Reasoning
Course of Action
A) All arguments are strong
Show Explanation
B) Only arguments I and II are strong
Show Explanation
C) Only arguments II and III are strong
Show Explanation
D) Only arguments I and III are strong
Show Explanation

Statements: No cities are countries. No countries are villages.

Conclusions:

(I) Some countries are cities.

(II) No villages are the city.

Punjab Mock 4
Logical Reasoning
Critical Thinking
A) Only conclusion (I) follows
Show Explanation
B) Only conclusion (II) follows
Show Explanation
C) Both conclusions follow
Show Explanation
D) Both of the conclusions do not follow
Show Explanation

What letter comes next in the following series? B D G K P

Punjab Mock 4
Logical Reasoning
Logical Deduction
A) C
Show Explanation
B) E
Show Explanation
C) B
Show Explanation
D) V
Show Explanation
E) Q
Show Explanation

8, 10, 14, 18, ___ , 34, 50 , 66:

Punjab Mock 4
Logical Reasoning
Letters and Symbols Series
A) 24
Show Explanation
B) 25
Show Explanation
C) 26
Show Explanation
D) 27
Show ExplanationA

George Orwell’s Animal Farm is a stinging ________ on the Russian revolution

Punjab Mock 4
English
Fill in the blank
A) Myth
Show Explanation
B) Satire
Show Explanation
C) Fallacy
Show Explanation
D) Legend
Show Explanation

Identify the incorrect segment:

The prime minister fired a broadside at the opposition leaders. A few of his remarks were not up at the mark.

Punjab Mock 4
English
Identify errors in sentence
A) of
Show Explanation
B) were
Show Explanation
C) up
Show Explanation
D) at
Show Explanation

All the _______ and ceremony of the royal wedding was telecast on the national television circuit.

Punjab Mock 4
English
Fill in the blank
A) Festival
Show Explanation
B) Romp
Show Explanation
C) Pomp
Show Explanation
D) Happiness
Show Explanation

Identify the incorrect segment:

Amjad was not conscious to the aberration he had committed in the public meeting. It was disliked by all and sundry.

Punjab Mock 4
English
Identify errors in sentence
A) to
Show Explanation
B) the
Show Explanation
C) in
Show Explanation
D) by
Show Explanation

He _____ the incident to the back of his mind.

Punjab Mock 4
English
Fill in the blank
A) Revered
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B) Regulated
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C) Reagitated
Show Explanation
D) Relegated
Show Explanation

Identify the incorrect segment:

Late Agha Shahi was an outstanding genius in the international affairs. He was gifted of the acumen to judge the future events, judge the future events in advance.

Punjab Mock 4
English
Identify errors in sentence
A) in
Show Explanation
B) of
Show Explanation
C) to
Show Explanation
D) in
Show Explanation

Pakistan __________ from voting against Iran in the United Nations.

Punjab Mock 4
English
Fill in the blank
A) Prevented
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B) Detained
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C) Abstained
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D) Refuse
Show Explanation

Do not lose heart,it is just a __________ in the teacup.

Punjab Mock 4
English
Fill in the blank
A) Wind
Show Explanation
B) Cyclone
Show Explanation
C) Blast
Show Explanation
D) Storm
Show Explanation

SPOT THE ERROR: In the following sentences, some segments of each sentence are underlined.Your task is to identify that underlined segment of the sentence, which contains the mistake that needs to be corrected.

Suddenly he stopped at the edge of the meadow, taking his pocket knife from his pocket, and cut a wisp of alfalfa.

Punjab Mock 4
English
Identify errors in sentence
A) Suddenly he stopped
Show Explanation
B) Taking his pocket knife
Show Explanation
C) His pocket
Show Explanation
D) Cut a wisp of alfalfa
Show Explanation

Please____________the door after you.

Punjab Mock 4
English
Fill in the blank
A) Close
Show Explanation
B) Shut
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C) Leave
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D) Knock
Show Explanation

He _____ the day they had bought such a large house.

Punjab Mock 4
English
Fill in the blank
A) Hues
Show Explanation
B) Rows
Show Explanation
C) Rues
Show Explanation
D) Dues
Show Explanation

Identify the incorrect segment:

The old man was sitting quite bamboozled when the swindler deprived him from his pension money by his evil tricks.

Punjab Mock 4
English
Identify errors in sentence
A) Quite
Show Explanation
B) From
Show Explanation
C) By
Show Explanation
D) His
Show Explanation

SPOT THE ERROR: In the following sentences, some segments of each sentence are underlined. Your task is to identify that underlined segment of the sentence, which contains the mistake that needs to be corrected.

When a low-wage category worker finds he has to maintain a large family, his expenses may exceeds his income.

Punjab Mock 4
English
Identify errors in sentence
A) When a low-wage
Show Explanation
B) Worker finds
Show Explanation
C) Maintain a large family
Show Explanation
D) Exceeds his income
Show Explanation

Select the incorrect segment:
Your argument is simply abstruse as there is no clarity of thought and coherence in ideas and it also lack vision.

Punjab Mock 4
English
Identify errors in sentence
A) Is
Show Explanation
B) Of
Show Explanation
C) In
Show Explanation
D) Lack
Show Explanation

Things have got out of hand; we must take steps to _________ the situation

Punjab Mock 4
English
Fill in the blank
A) Rectify
Show Explanation
B) Pacify
Show Explanation
C) Purify
Show Explanation
D) Testify
Show Explanation

SPOT THE ERROR: In the following sentences, some segments of each sentence are underlined.Your task is to identify that underlined segment of the sentence, which contains the mistake that needs to be corrected.

The study of population growth indicates one of the greatest paradox of our time.

Punjab Mock 4
English
Identify errors in sentence
A) The study
Show Explanation
B) Population growth
Show Explanation
C) One of the
Show Explanation
D) Paradox
Show Explanation

She managed to __________ a ticket for the cricket match.

Punjab Mock 4
English
Fill in the blank
A) Procure
Show Explanation
B) Obscure
Show Explanation
C) Improvise
Show Explanation
D) Preclude
Show Explanation

My advice had no ______________ on him.

Punjab Mock 4
English
Fill in the blank
A) Effect
Show Explanation
B) Affect
Show Explanation
C) Influence
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D) Impression
Show Explanation

The expression for centripetal force is given by:

Punjab Mock 4
Physics
Circular Motion & Momentum
A) mrω2
Show Explanation
B) m2v2/r2
Show Explanation
C) m2v2/r
Show Explanation
D) mv2/r2
Show Explanation

Object A has a charge of 15 mC, and object B has a charge of 10 mC. Which statement is true about the electric forces on the objects?

Punjab Mock 4
Physics
Electrostatics
A) FAB = -3 FBA
Show Explanation
B) FAB = – FBA
Show Explanation
C) 3 FAB = – FBA
Show Explanation
D) -3 FAB = 2 FBA
Show Explanation

In case of harmonic oscillator total energy remains

Punjab Mock 4
Physics
Oscillations and Simple Harmonic Motion
A) variable
Show Explanation
B) infinity
Show Explanation
C) constant
Show Explanation
D) zero
Show Explanation

If a resistor having resistance ‘R’ is cut into three equal parts, then the
equivalent of parallel combination is:

Punjab Mock 4
Physics
Current Electricity
Wire Wound Variable Resistors
A) 6/R
Show Explanation
B) 3/R
Show Explanation
C) . R/9
Show Explanation
D) R/3

Show Explanation

Which of the following can be used to produce population inversion for the emission of Laser?

Punjab Mock 4
Physics
Atomic Spectra
Laser
A) Optical pumping
Show Explanation
B) Optical fibre
Show Explanation
C) Optical instrument
Show Explanation
D) Optical polarization
Show Explanation

If ‘A’ is fundamental dimension of ampere then the dimension of magnetic field strength is:

Punjab Mock 4
Physics
Magnetism and Electromagnetic Induction
Magnetic Flux and Flux Density
A) [MT2A-2]
Show Explanation
B) [MT-²2AL²]
Show Explanation
C) [MT2A-2]
Show Explanation
D) [MT2A-2]
Show Explanation

If ‘m’ is the mass, ‘c’ is the velocity of light and x = mc2, then dimensions of ‘x’ will be:

Punjab Mock 4
Physics
Dawn of Modern Physics
A) [LT-1]
Show Explanation
B) [ML2T-2]
Show Explanation
C) [MLT-1]
Show Explanation
D) [MLT-2]
Show Explanation

The wavelength of the electromagnetic wave having frequency of 3 kHz will be?

Punjab Mock 4
Physics
Dawn of Modern Physics
A) 120 km
Show Explanation
B) 100 km
Show Explanation
C) 80 km
Show Explanation
D) 140 km
Show Explanation

Which one of the following is I-V curve of a junction diode?

Punjab Mock 4
Physics
Electronics
P-N Junction and its Characteristics
A) Option A
Show Explanation
B) Option B
Show Explanation
C) Option C
Show Explanation
D) Option D
Show Explanation

What is the number of spectral series in the hydrogen spectrum?

Punjab Mock 4
Physics
Atomic Spectra
Spectrum of Hydrogen Atom
A) Four
Show Explanation
B) Three
Show Explanation
C) Five
Show Explanation
D) One
Show Explanation

In simple harmonic motion, acceleration will be maximum, when object is at:

Punjab Mock 4
Physics
Oscillations and Simple Harmonic Motion
A) Maximum displacement from the mean position
Show Explanation
B) Center position
Show Explanation
C) Half of the maximum displacement from mean position
Show Explanation
D) Mean position
Show Explanation

The wavelength of the electromagnetic wave having frequency of 3 kHz will be?

Punjab Mock 4
Physics
Dawn of Modern Physics
A) 120 km
Show Explanation
B) 100 km
Show Explanation
C) 80 km
Show Explanation
D) 140 km
Show Explanation

Arshad is driving down 7th street, he drives 150m in 18s.
Assume he does not speed up or slow down, what is his speed:

Punjab Mock 4
Physics
Forces and Motion
A) 0.38m/s
Show Explanation
B) 126m/s
Show Explanation
C) 8.33m/s
Show Explanation
D) 58.33m/s
Show Explanation

Which one of the following is not electromagnetic in nature.

Punjab Mock 4
Physics
Atomic Spectra
A) X-rays
Show Explanation
B) Gamma rays
Show Explanation
C) Cathode rays
Show Explanation
D) Infrared rays
Show Explanation

The speed of sound through a gas is measured as 340 m/s at pressure P1 and temperature T1. What will be the speed of sound if the pressure of a gas is doubled but the temperature is kept constant?

Punjab Mock 4
Physics
Wave Motion and Sound
A) 342 m/s
Show Explanation
B) 340 m/s
Show Explanation
C) 170 m/s
Show Explanation
D) 680 m/s
Show Explanation

In Double Slit experiment, the fringe spacing of the diffracted rays increases when:

UHS 2019
Physics
Optics, Nature of Light and Optical Instruments
Young’s Double Slit Experiment
A) the wavelength of the diffracted rays increases
Show Explanation
B) the distance between the slits increases
Show Explanation
C) the distance from mid points of the slits to the central of the fringe on the screen increases
Show Explanation
D) the distance between the screen and the slits decreases
Show Explanation

For projectile motion, in the absence of air resistance:

Punjab Mock 4
Physics
Forces and Motion
Motion in Two Dimensions
A) Horizontal acceleration is zero
Show Explanation
B) Vertical acceleration is zero
Show Explanation
C) Horizontal force is constant
Show Explanation
D) Vertical speed is constant
Show Explanation

If electrons of charge ‘e’, with rest mass ‘m’, are accelerated through a potential difference ‘V’ and strike a metal target, then velocity of electrons is:

Punjab Mock 4
Physics
Current Electricity
A) Ve/m
Show Explanation
B) √(Ve/m)
Show Explanation
C) √(Ve/)2m
Show Explanation
D) √(2Ve/m)
Show Explanation

The image received of absorbed x rays is

Punjab Mock 4
Physics
Atomic Spectra
Inner Shell Transitions And Characteristic X-rays
A) inverted
Show Explanation
B) real
Show Explanation
C) any of a or b
Show Explanation
D) virtual
Show Explanation

Which of the following has zero average value in a plane electromagnetic wave:

Physics
Electromagnetic Waves
Production of electromagnetic waves
A) kinetic energy
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B) magnetic field
Show Explanation
C) electric field
Show Explanation
D) both (b) and (c)
Show Explanation

What is the output of the truth table?

UHS 2014
Physics
Electronics
Fundamental Logic Gates
A) A
Show Explanation
B) A AND C
Show Explanation
C) B
Show Explanation
D) NO CORRECT OPTION
Show Explanation

Laser beam can be used to generate three-dimensional image of object in a process called:

Punjab Mock 4
Physics
Atomic Spectra
Laser
A) Computed technology
Show Explanation
B) Computed tomography
Show Explanation
C) Holography
Show Explanation
D) Computerized axial tomography
Show Explanation

A car is moving in a circular track of radius 20m at a constant speed of 20m/sec. Find the centripetal acceleration?

Punjab Mock 4
Physics
Circular Motion & Momentum
A) 20 m/s^2
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B) 40 m/s^2
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C) 30 m/s^2
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D) 10 m/s^2
Show Explanation

When the length of simple pendulum is doubled, the ratio of its new time period to old time period is:

Punjab Mock 4
Physics
Oscillations and Simple Harmonic Motion
A) 3√2
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B) 1√2
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C) 2√2
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D) √2
Show Explanation

The range Of the projectile depends upon the velocity of the projection and the angle of the projection i.e 45. For a fixed velocity, when the angle of projection is larger than 45. Which of the following is correct?

Punjab Mock 4
Physics
Forces and Motion
Motion in Two Dimensions
A) The height attained by the projectile will be more but the range is less
Show Explanation
B) Both the height and the range attained by the projectile will be more.
Show Explanation
C) The height attained by the projectile will be less but the range is more.
Show Explanation
D) Both the height and the range attained by the projectile will be less.
Show Explanation

For a certain organ pipe, three successive resonance frequencies are observed at 425, 595, and 765 Hz. The speed of the sound in air is 340 m/s. The pipe is:

Punjab Mock 4
Physics
Wave Motion and Sound
A) Closed pipe of length 1 m
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B) Closed pipe of length 2 m
Show Explanation
C) Open pipe of length 1 m
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D) Open pipe of length 2 m
Show Explanation

A negatively charged particle initially at rest is placed in an electric field that varies from point to point. There are no other fields. Then:

Punjab Mock 4
Physics
Electrostatics
A) The particle moves along the electric line of force passing through it.
Show Explanation
B) The particle moves opposite to the electric line of force passing through it.
Show Explanation
C) The direction of acceleration of the particle is tangential to the electric line of force at every instant.
Show Explanation
D) The direction of acceleration of the particle is normal to the electric line of force at every instant.
Show Explanation

In a full-wave rectification, the number of diodes used are:

Punjab Mock 4
Physics
Electronics
Rectification
A) 1
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B) 2
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C) 3
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D) 4
Show Explanation

Three 6 Ω are connected as shown in the diagram What is the resistance between points ‘A’ and ‘B’

Punjab Mock 4
Physics
Current Electricity
Wire Wound Variable Resistors
A) 6 Ω
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B) 16 Ω
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C) 4 Ω
Show Explanation
D) 2 Ω V
Show Explanation

The angular measurement is known as _____ measurement

Punjab Mock 4
Physics
Circular Motion & Momentum
A) parameter
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B) area
Show Explanation
C) circumference
Show Explanation
D) all of these
Show Explanation