FSC Physics MCQs Chapter 11 Class 11

Created on February 07, 2022 By Ali Durrani

Physics Ch 11 Class 11 Heat and Thermodynamics

1 / 60

Refrigerator is an example of:

NUMS 2020
Physics
Heat and Thermodynamics
Elimination Tool:

A) First law of thermodynamics

B) Second law of thermodynamics

C) Newton law of motion

D) Entropy

2 / 60

Efficiency of the Carnot’s cycle will be 100% if the temperature of cold reservoir is:

+273K

-273K

100K

0 K

3 / 60

Find the heat transferred to or from the system when a thermodynamics system undergoes a process in which its internal energy decreases by 300 J. If at the same time, 120 J of work is done on the system.

NTS 2016 DUHS & JSMU
Physics
Heat and Thermodynamics
Elimination Tool:

A) -120 J

B) -220 J

C) -320 J

D) -420 J

4 / 60

If speed of a fan in a room is Increased then the temperature of air in the room will

Decrease

Increase

Remain Same

Either a or b

5 / 60

According to kinetic theory,

NUMS 2019 Reconduct
Physics
Heat and Thermodynamics
Elimination Tool:

A) The pressure exerted by a gas is proportional to mean square velocity of the molecules

B) The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

C) The root mean square velocity is inversely proportional to the temperature

D) The mean translational K.E. of the molecule is directly proportional to the absolute temperature

6 / 60

Absolute zero is equivalent to:

NUMS 2019 Cancelled
Physics
Heat and Thermodynamics
Elimination Tool:

A) 0K

B) -273 C

C) -459.4 F

D) All of these

7 / 60

As the temperature of the black body is raised, the black body radiations become richer in:

NUMS 2015
Physics
Heat and Thermodynamics
Elimination Tool:

A) Intermediate wavelengths

B) Longer wavelengths

C) Shorter wavelengths

D) Low frequencies

8 / 60

The equation ΔU = ΔQ refers to:

NTS 2012
Physics
Heat and Thermodynamics
Elimination Tool:

A) Isothermal process

B) Adiabatic process

C) Isochoric process

D) Isobaric process

9 / 60

The temperature of a body at 100 °C is increased by Δ𝛉 as measured on the Celsius scale. How is this temperature change expressed on the Kelvin scale?

NTS 2013
Physics
Heat and Thermodynamics
Elimination Tool:

A) Δ𝛉 + 373

B) Δ𝛉 + 273

C) Δ𝛉 + 100

D) Δ𝛉

10 / 60

The value of universal constant “R” is:

NUMS 2016
Physics
Heat and Thermodynamics
Elimination Tool:

A) Charle’s law

B) 8814 J mole-3 K-3

C) 1 38J mole-I VI

D) 8.314 J mole-I K-l

11 / 60

A machine worker placed a cylinder with a diameter of 18 cm between the plates of a hydraulic press. If he applies a 4.25 x 105N force to the cylinder, the stress on the end of the cylinder due to the applied force is A x 107Pa.

What is the value of A?

NUMS 2019 Cancelled
Physics
Heat and Thermodynamics
Elimination Tool:

A) 1

B) ½

D) 1.67

C) 1.3

12 / 60

The amount of heat provided to a system at constant pressure (qp) is equal to _______.

NTS 2012
Physics
Heat and Thermodynamics
Elimination Tool:

A) Change in internal energy (ΔE)

B) Change in enthalpy (ΔH)

C) Change in free energy (ΔG)

D) Change ín temperature only (ΔT)

13 / 60

Entropy is the measure of of a system

Heat

Kinetic energy

Momentum

Disorder

14 / 60

A fixed mass of an ideal gas absorbs 1000 J of heat and expands under a constant pressure of 20 kPa from a volume of 25 x 10-3 m3 to a volume of 50 x 10-3 m3. What is the change in the internal energy of the gas?

NTS 2017
Physics
Heat and Thermodynamics
Elimination Tool:

A) －1000J

B) －900J

C) Zero

D) ＋500 J

15 / 60

A thermocouple is immersed in water at 373 K and the other in ice at 273K. The emf of the thermocouple Is 90 (μ)V for each 1 K difference in temperature between junctions, and the thermocouple resistance is 6 Ω. What current will flow in the galvanometer connected in series with an internal resistance of 30ohms?

NTS 2010
Physics
Heat and Thermodynamics
Current Electricity
Elimination Tool:

A) 1.8 μA

B) 250 μA

C) 300 μA

D) 1.5 mA

16 / 60

Conversion of heat energy completely into work violates:

NUMS 2014
Physics
Heat and Thermodynamics
Elimination Tool:

A) Zeroth law of thermodynamics

B) 1st law of thermodynamics

C) 2nd law of thermodynamics

D) 1st and 2nd law of thermodynamics

17 / 60

The sum of all forms of molecular energies in a thermodynamic system is known as:

NTS 2017
Physics
Heat and Thermodynamics
Elimination Tool:

A) Entropy

B) Enthalpy

C) Internal energy

D) Red shift

18 / 60

Entropy on melting of ice

Remains same

Increases

Decreases

Decreases slightly

19 / 60

A sample of an ideal gas may : expand adiabatically or expand isothermally. The net flow of heat into the gas from the exterior is:

NTS 2017
Physics
Heat and Thermodynamics
Elimination Tool:

B) Negative for I and positive for II

C) Positive for I and negative for II

D) Zero in each case

E) Zero in I and positive for II

20 / 60

If the temperature of cold reservoir is 12C and that of hot reservoir is 27C, the efficiency of Carnet Engine • All be?

95%

5%

55%

45%

21 / 60

Kelvin, is the unit of thermodynamic temperature, which is ________ of the thermodynamic temperature of the triple point of water.

NTS 2015 DUHS and JSMU
Physics
Heat and Thermodynamics
Elimination Tool:

A) 1/100.6

B) 1/273.16

C) 1/32.6

D) 1/241.6

22 / 60

A system absorbs 1000 Joules of heat and delivers 600 Joules of work, while losing 100 Joules of heat by conduction to the atmosphere, the change in the internal energy of the system will be:

NTS 2012
Physics
Heat and Thermodynamics
Elimination Tool:

A) 600 Joules

B) 900 Joules

C) 300 Joules

D) 400 Joules

23 / 60

With the usual notation, the first law of thermodynamics applied to one mole of an ideal gas can be written in the following form:

CvΔT=ΔQ – PΔV

In a change for which Boyle’s law is obeyed, which of the following would necessarily be zero?

NTS 2017
Physics
Heat and Thermodynamics
Elimination Tool:

A) ΔQ

B) Cv

C) ΔT

D) P

24 / 60

If constant temperature conditions are applied to a gas container, then the volume of the mass of that gas tends to increase by:

NTS 2018
Physics
Heat and Thermodynamics
Elimination Tool:

A) Decreasing the applied pressure

B) Increasing the applied pressure

C) Increasing the applied pressure with double force

D) Increasing the weight

25 / 60

According to the first law of thermodynamics, ΔU = Q + W, where ΔU Is the increase in internal energy of the system, Q is the heat transferred to the system and W is the external work done on the system.
Which of the following is NOT a correct expression?

NTS 2010
Physics
Heat and Thermodynamics
Elimination Tool:

A) At constant temperature: Q = -W

B) When no work is done: ΔU = Q

C) In gaseous system: ΔU = Q + P Δ V

D) When work is done by the system: ΔU = Q + W

26 / 60

In which process the entire heat supplied to the gas is converted to the internal energy of the gas?

PMC 2020
Physics
Heat and Thermodynamics
Elimination Tool:

A) Isochoric process

B) Isobaric process

C) Isothermal process

D) Adiabatic process

27 / 60

Bimetallic thermostat is an example of:

NTS 2018
Physics
Heat and Thermodynamics
Elimination Tool:

A) Electric field

B) Thermal expansion

C) Heat engine

D) Isobaric process

28 / 60

In a certain process, 400 J of heat energy is supplied to a system and at the same time 150 J of work is done by the system. The increase in internal energy of the system is _______.

NUMS 2020
Physics
Heat and Thermodynamics
Elimination Tool:

A) 150 J

B) 300 J

C) 250 J

D) 500 J

29 / 60

If an ideal gas has volume V at 27 C and it is heated at constant pressure so that its volume becomes 1.5 V, then the value of final temperature is:

NUMS 2018
Physics
Heat and Thermodynamics
Elimination Tool:

A) 327 K

B) 177 C

C) 873 K

D) 600 C

30 / 60

If N, m, V and c represent the number of molecules, mass of a molecule, volume of cubical container and speed of a molecule respectively then by using the method dimensions, check which of the following expressions represents the pressure (p) of a gas?

NUMS 2019 Cancelled
Physics
Heat and Thermodynamics
Elimination Tool:

A) P = ⅓ Nm/v2(c2)

B) P = ⅓ Nm/v2(c)

C) P = ⅓ Nm/v (c2)

D) P = ⅕ Nm2/ v (c2)

31 / 60

As a result of the natural process the entropy

Increases

Remains Same

Decreases

Either a or c

32 / 60

The entropy of the universe always:

NUMS 2016
Physics
Heat and Thermodynamics
Elimination Tool:

A) Decreases

B) Increases

C) Remains the same

D) Both A and B

33 / 60

For adiabatic process, the first law of thermodynamics is:

NUMS 2016
Physics
Heat and Thermodynamics
Elimination Tool:

A) w =∆u = Q

B) Q = -w

C) Q = w

D) w = -∆u

34 / 60

A steel rod has a length of 15 m at a temperature of 30°C. If the temperature is raised to 45°C. The increase in its length is:

(α= 1.1 x 10-5 K-1)

NTS 2014
Physics
Heat and Thermodynamics
Elimination Tool:

A) 537.1 x 10-5 m

B) 447.5 x 10-5 m

C) 327.5 x 10-5 m

D) 247.5 x 10-5 m

35 / 60

The efficiency of the carnot’s Engine Working between 150°C and 50°C is:

NTS 2011
Physics
Heat and Thermodynamics
Elimination Tool:

A) 22.3%

B) 20.0%

C) 23.6%

D) 30.6%

36 / 60

The amount of heat at constant volume is called as:

NTS 2013
Physics
Heat and Thermodynamics
Elimination Tool:

A) Internal energy

B) Enthalpy

C) Entropy

D) Temperature

37 / 60

“At constant pressure, the volume of gas is directly proportional to Absolute Temperature” this is known as?

NTS 2015 SMBBMC
Physics
Heat and Thermodynamics
Elimination Tool:

A) Boyle’s law

B) isothermal process

C) general gas law

D) Charles law

38 / 60

If the temperature is increased from 200K to 800K, then what would be the change in pressure at constant volume?

NUMS 2016
Physics
Heat and Thermodynamics
Elimination Tool:

A) Increases by factor 4

B) Decreases by factor 4

C) Increases by factor 2

D) Decreases by factor 2

39 / 60

All the heat supplied to a system is converted into work in the ______ process.

NTS 2016 DUHS & JSMU
Physics
Heat and Thermodynamics
Elimination Tool:

A) Isochoric

B) Isobaric

C) Isothermal

D) Isentropic

40 / 60

When earthquake occurs. What happens to the entropy of Earth?

It Increases

It Decreases

It Stays the Same

First Increases then decreases back to normal

41 / 60

The internal energy of a system during an isothermal process:

PMC 2020
Physics
Heat and Thermodynamics
Elimination Tool:

A) Decreases

B) Increases

C) Become zero

D) Remain constant

42 / 60

The rapid escape of air from a burst tyre is an example of:

NUMS 2020
Physics
Heat and Thermodynamics
Elimination Tool:

A) Isothermal

B) Adiabatic

C) Isobaric

D) Isochoric

43 / 60

If the volume of a gas is fixed then on increasing its temperature, its pressure______

NTS 2016 SMBBMC
Physics
Heat and Thermodynamics
Elimination Tool:

A) Gets negligible

B) Gets constant

C) Rises

D) Falls

44 / 60

A fixed mass of gas in a thermally insulated container is compressed. After compression, the temperature of the gas will have:

NTS 2017
Physics
Heat and Thermodynamics
Elimination Tool:

A) fallen, since more molecules bombarded the container and so they must be moving slower

B) , since more molecules collide more frequently with one another and so their average speed is lower

C) remained constant if the compression is very slow

D) risen, since doing work on the gas increases the kinetic energy of the molecules

45 / 60

Kelvin, the unit of thermodynamic temperature is _____ of the thermodynamic temperature of the triple point of water.

NTS 2014
Physics
Heat and Thermodynamics
Elimination Tool:

A) 1/100

B) 1/212

C) 1/273.16

D) 1/32

46 / 60

22320 cal heat is supplied to 100g of ice at zero degree centigrade. If the latent heat of fusion of ice is 80 cal /g and latent heat of vaporization of water is 540 cal/g the final amount of water thus obtained and its temperature respectively are:

NUMS 2014
Physics
Heat and Thermodynamics
Elimination Tool:

A) 8 g and 100 degrees centigrade

B) 100 g and 90 degrees centigrade

C) 92 g and 100 degrees centigrade

D) 82g and 100 degrees centigrade

47 / 60

A copper wire has resistances 10 ohms and 20 ohms at temperature 0 C and 10 C respectively. What is the temperature coefficient of the copper wire?

NUMS 2016
Physics
Heat and Thermodynamics
Elimination Tool:

A) 0.1 K-1

B) 0.02 K-1

C) 0.01 K-1

D) 0.2 K-1

48 / 60

Law of heat exchange is used to determine:

NTS 2018
Physics
Heat and Thermodynamics
Elimination Tool:

A) Coefficient of linear expansion

B) Coefficient of volume expansion

C) Ideal gas constant

D) Specific heat of a substance

49 / 60

During isothermal process which of the following remains constant:

Temperature

Pressure

Volume

Heat

50 / 60

The quantity of heat required to raise the temperature of one mole of a substance through 1 K is called:

NTS 2010
Physics
Heat and Thermodynamics
Elimination Tool:

A) Carnot engine

B) Molar specific heat

C) Kinetic specific heat

D) General gas law

51 / 60

The bicycle pump works on the basis of:

NUMS 2020
Physics
Heat and Thermodynamics
Elimination Tool:

A) 1st Law of thermodynamics

B) 2nd Law of thermodynamics

C) Law of conservation of energy

D) Law of entropy

52 / 60

The temperature coefficient of normal-conductor is negative because:

NUMS 2020
Physics
Heat and Thermodynamics
Elimination Tool:

A) Resistance increases with increase of temperature

B) Resistance decreases with increase of temperature

C) Resistance decreases with decrease of temperature

D) Resistance remains same with increase of temperature

53 / 60

The efficiency of the Carnot engine working between temperatures 177°C and 77°C will be:

NTS 2018
Physics
Heat and Thermodynamics
Elimination Tool:

A) 22.22%

B) 23.23%

C) 25.25%

D) 30.30%

54 / 60

For one mole of gas, the relation for specific heat capacity at constant pressure ‘Cp’ and at constant volume ‘Cv’ is ________.

NUMS 2019 Reconduct
Physics
Heat and Thermodynamics
Elimination Tool:

A) Cp + Cv = R

B) Cp – R = Cv

C) Cv – R = Cp

D) Cp + R = Cv

55 / 60

Which of the ,following act as a heat pump?

Refrigerator

Air conditioner

Deep Freezers

All of the above

56 / 60

How much heat is absorbed by 100 g of water when its temperature decreases from 25. C to 5. C? (heat capacity is 4.2 j/gk)

NUMS 2016
Physics
Heat and Thermodynamics
Elimination Tool:

A) 84,000 J

B) -2000/4.2 J

C) 2000/4.2 J

D) -8400

57 / 60

If Cp = 10 & Cv = 7, then the general gas constant equals:

17

3

14

21

58 / 60

A frictional piston-cylinder based enclosure contains some amount of gas at a pressure of 400k Pa. Then heat is pressure in a quasi-static process. The piston moves up slowly through a height of 10cm. lf the piston has across section area of 0.3m2,the work done by the gas in the process is:

NUMS 2014
Physics
Heat and Thermodynamics
Elimination Tool:

A) 6kj

B) 12kj

C) 75kj

D) 24kj

59 / 60

22320 cal heat is supplied to 100g of ice at zero degree centigrade. If the latent heat of fusion of ice is 80 cal /g and latent heat of vaporization of water is 540 cal/g the final amount of water thus obtained and its temperature respectively are:

NUMS 2019 Cancelled
Physics
Heat and Thermodynamics
Elimination Tool:

A) 8 g, 100 degree centigrade

B) 100 g , 90degree centigrade

C) 92 g, 100 degree centigrade

D) 82g, 100 degree centigrade

60 / 60

Compression of gas under constant temperature is process:

Adiabatic

Isothermal

Isochoric

Isobaric

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