There are initially 400 atoms in a radioactive sample. What would be the number of atoms after 3 half – life?

PMC 2020
Physics
Nuclear Physics
Elimination Tool:

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1kV, its kinetic energy will be:

NUMS 2016
Physics
Magnetism and Electromagnetic Induction
Elimination Tool:

A body is moving in a circle at constant speed. Which statement is true?

PMC Sample 1
Physics
Circular Motion and Momentum
Elimination Tool:

If each particle of fluid is passing through the same point, what would be the flow?

NUMS 2016
Physics
Fluid Dynamics
Elimination Tool:

The charge on neutron is:

NUMS 2018
Physics
Electrostatics
Elimination Tool:

If the velocity v being a vector quantity is multiplied to scaler quantity mass, the result will be:

A proton Is moving in direction of negative x-axis, what will happen to it if potential difference of V = -10x + 7 is applied across the field.

When interference between thin films occurs, the path difference between two interfering rays is 2t. If ‘n’ is the refractive index of the medium, the bright circles are obtained when ________ with m = 0, 1, 2, 3, …

NUMS 2019 Reconduct
Physics
Electromagnetic Waves
Elimination Tool:

A body of mass m moving with velocity v has a kinetic energy K. If its velocity is increased by 25%, what will be the work done in terms of K.E?

Two convex lenses of equal focal length ‘f’ are placed in contact, the resultant focal length of the
combination is

Who proposed matter waves?

A cable 4 km long and of total resistance 1 Ohm carries electric current from a generator producing 100kW at 10,000 Volts. The current in amperes in the cable is:

PMC Practice 5
Physics
Electronics
Elimination Tool:

When an electron jumps from outer to 5th orbit, then the spectral lines fall into region.

When the antinodes, in stationary waves, are passing through their equilibrium position, the energy is:

NUMS 2020
Physics
Wave Motion and Sound
Elimination Tool:

What is the dimension of magnetic field

When brakes of a car are applied, angular velocity of a flywheel reduces from 900 cycle / min to 720 cycle / min in 6 sec. Angular retardation is:

NUMS 2015
Physics
Circular Motion and Momentum
Elimination Tool:

If the velocity of particle is varying linearly with time then shape of d-t curve would be

PMC Sample 2
Physics
Motion in Two Dimensions
Elimination Tool:

When the speed of your car is halved, by what factor does its kinetic energy decreases?

PMC 2020
Physics
Work, Power and Energy
Elimination Tool:

A cathode ray oscilloscope is displaying an AC signal. If one wave is completed in 2 cm along X- axis and time-base setting is 10 ms/cm, then frequency of AC signal will be:

NUMS Mock 4
Physics
Wave Motion and Sound

Which light photon has the least momentum?

PMC Practice 6
Physics
Dawn of Modern Physics
Elimination Tool:

Transvers waves can transfer their energy on, In

A particle carrying charge of 2e falls through a potential difference of 3.0 V. Calculate energy acquired by it.

NTS 2015 DUHS and JSMU
Physics
Electrostatics
Elimination Tool:

Which of the following particles has greater wavelengths having the same velocity?

NUMS Mock 3
Physics
Optics, Nature of Light and Optical Instruments

Density of blood is:

NUMS 2016
Physics
Fluid Dynamics
Elimination Tool:

Astronomers calculate speed of distant stars and galaxies using which of the following phenomena:

PMC 2020
Physics
Wave Motion and Sound
Elimination Tool:

Consider the spectral line resulting from the transition from n=2 to n=1, in atoms and ions given below. The shortest wavelength is produced by:

PMC Sample 3
Physics
Atomic Spectra
Elimination Tool:

There is no noticeable boundary between core and cladding.

At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.1 m/s2. At the same instant a truck, traveling with a constant speed of 9.2 m/s, overtakes and passes the automobile. How far beyond the traffic signal will the automobile overtake the truck?

NTS 2010
Physics
Motion in Two Dimensions
Elimination Tool:

If the direction of current in two parallel wires is In opposite direction, then the wires will:

The direct exposure of sun light where ozone layer is depleted will cause:

2022 PMC Test 1
Physics
Electromagnetic Waves
Elimination Tool:

1 femto is equal to

The wavelength associated with an electron is of the order of:

PMC 2020
Physics
Wave Motion and Sound
Elimination Tool:

A current of 4.4 amperes is following in a write. How many electrons pass a given point in the wire in one second, if the charge on an electron is 1.6×10-19
Coulomb?

NTS 2011
Physics
Current Electricity
Elimination Tool:

If Compton shift is half of Compton wavelength, then the scattering angle would be:

If a convex lens of focal length ‘f’ is cut into two identical halves along the lens diameter, the focal length
of each half is.

A wave passes through a medium, each particle of the medium performs 100 complete vibrations in 5 seconds. What is the frequency of the wave:

PMC Sample 1
Physics
Wave Motion and Sound
Elimination Tool:

1 radian = _____ degrees.

NTS 2012
Physics
Circular Motion and Momentum
Elimination Tool:

The phenomena in which certain metals emit electrons when exposed to high-frequency light is known as?

NTS 2014
Physics
Dawn of Modern Physics
Elimination Tool:

The electron volt is the unit of __________.

PMC Practice 3
Physics
Electronics
Elimination Tool:

The energy stored in the capacitor is written as:

NUMS Mock 2
Physics
Electrostatics

Simple Harmonic Motion of a body is described by which statements mentioned below:

K : K.E is maximum when displacement x = 0

L : P.E is maximum when x = 0

M : P.E is maximum when x = ± x0

UHS 2018
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

Due to the magnetic force, a positively charged particle executes uniform circular motion within a uniform magnetic field ‘B’. If the charge is ‘q’ and radius of its path is r, which of the expressions gives the magnitude of the particle’s linear momentum:

NTS 2010
Physics
Magnetism and Electromagnetic Induction
Elimination Tool:

By changing the current through the same coil, an emf is induced in it, the process is known as:

NTS 2015 SMBBMC
Physics
Magnetism and Electromagnetic Induction
Elimination Tool:

For a stiff spring, the value of spring constant is:

NUMS 2019 Cancelled
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A force F = 0.12 N is applied on a spring and the spring elongates by 3 cm. The specific constant of the spring is?

NUMS 2017
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

The phenomenon in which certain elements emit invisible radiations is called:

NTS 2018
Chemistry
Atomic Spectra
Elimination Tool:

The slope of distance – time graph will always be:

PMC 2020
Physics
Motion in Two Dimensions
Elimination Tool:

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:

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe:

UHS 2013
Physics
Fluid Dynamics
Elimination Tool:

A force F = 0.12 N is applied on a spring and the spring elongates by 3 cm. The specific constant of the spring is?

NUMS Mock 2
Physics
Oscillations and Simple Harmonic Motion

The velocity of a disc at the bottom of an inclined plane is?

The mass of earth on the basis of Newton’s Law of Gravitation is given by:

NTS 2012
Physics
Gravitation
Elimination Tool:

The half-life of C14 is approximately 5,730 years, while the half-life of C12 is essentially infinite. If the ratio of C14 to C12 in a certain sample is 25% less than the normal ratio in nature, how old is the sample?

NTS 2013
Physics
Nuclear Physics
Elimination Tool:

When transistor Is forward biased then resistance will be: b a) Nano ohms ) Kilo ohms c) Mega ohms

A material that does NOT become radioactive after absorbing neutrons is called.

NTS 2019
Physics
Nuclear Physics
Elimination Tool:

Which of the following particles has greater wavelengths having the same velocity?

NUMS 2019 Reconduct
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:

If stress is applied on a body then the ratio of change in volume to original volume will be:

NUMS 2016
Physics
Physics of Solids
Elimination Tool:

The velocity of X rays is equal to that of:

NUMS 2018
Physics
Atomic Spectra
Elimination Tool:

A hydrogen atom in its ground state absorbs 10.2 eV of energy. What is the orbital angular momentum is increased by?

PMC Sample 3
Physics
Atomic Spectra
Elimination Tool:

The frequency of AC used in Pakistan is

A tuning fork A produces 4 beats with another tuning fork B. if the frequency of tuning fork B is 320 Hz, then the frequency of tuning fork A is:

PMC Practice 21
Physics
Electromagnetic Waves
Elimination Tool:

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:

Electromagnetic wave theory was proposed by:

NTS 2015 SMBBMC
Physics
Dawn of Modern Physics
Elimination Tool:

In the breakdown region zener behaves like a

PMC Sample 2
Physics
Electronics
Elimination Tool:

How can we define linear magnification produced by a lens?

NTS 2015 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:

Transformer is a device which steps up or steps down the input:

PMC 2020
Physics
Magnetism and Electromagnetic Induction
Elimination Tool:

The ratio of tensile strength to tensile strain is called:

UHS 2012
Physics
Physics of Solids
Elimination Tool:

A 50 watt bulb is operated by 120 volts. What is the current through the bulb?

NTS 2016 SMBBMC
Physics
Current Electricity
Elimination Tool:

Which of the following can’t be used as a dielectric in a capacitor

If voltage of a capacitor is 60 v then what will be the voltage if diamond is present as •dielectric

In full wave rectifier with input frequency 50 Hz the ripple in the output is mainly of frequency

PMC Practice 6
Physics
Electronics
Elimination Tool:

Formation of colours in a thin film of oil is due to:

NTS 2015 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:

A car starts from rest and moves with constant acceleration. During the 4th second of its motion, it covers a distance of 21 meters. The acceleration of the car is _____ m.

NTS 2019
Physics
Motion in Two Dimensions
Elimination Tool:

Two capacitors C1 = 2μF and C2 = 4μF, are connected in series across a 100 V supply.

Find the effective capacitance:

NTS 2010
Physics
Electrostatics
Elimination Tool:

A car 500 kg is travelling at a constant speed of 9 m/s round a curve of 100m. What is the centripetal force?

NTS 2019
Physics
Circular Motion and Momentum
Elimination Tool:

An ammeter reads up to 1 A. Its internal resistance is 0.81 Ω. To increase the range to 10 A, the value of the required shunt is:

NTS 2012
Physics
Current Electricity
Elimination Tool:

In Young’s Experiment, the central spot In Interference pattern is

A wire is stretched by a force ‘F’ which causes an extension ∆l, the energy stored in the wire is:

UHS 2012
Physics
Physics of Solids
Elimination Tool:

Third law of Newton is also called:

NUMS 2016
Physics
Forces and Motion
Elimination Tool:

In Compton’s effect the wavelength of the scattered photon is

When an observer moves with velocity of light, relative to a timing device at rest, he would notice:

NUMS 2015
Physics
Dawn of Modern Physics
Elimination Tool:

Which of the following gives the relationship between linear velocity and angular velocity?

NUMS Mock 3
Physics
Circular Motion and Momentum

Which one of the following requires no medium?

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

The energy equivalent to 0.9 mg is? a) 9 x 1091 b) 8.1 x 10″J •

The vector product of two vectors A and B is ____ vectors A and B.

NTS 2019
Physics
Scalars and Vectors
Elimination Tool:

In rotational motion, angular momentum plays a role which is analogous to that played by _____ in linear motion.

NUMS Mock 3
Physics
Circular Motion and Momentum