Question # 1

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

Astrophysics is a branch of physics, which deals with

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Sub-atomic

Stars and galaxies

Light and sound

Music

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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Energy only

Momentum only

Mass only

Charge only

Both (A) and (B)

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

The body will move with terminal velocity when it acquires

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minimum speed

zero speed

maximum speed

none of them

The device which allows only the flow of an A.C. through a circuit is

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Capacitor

Inductor

D.C. motor

Battery

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

Density is defined as:

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Mass per volume

Volume per mass

Mass x volume

Mass per length

SI unit of work is

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N-m

N-m²

N-ms^-1

N-ms^-2

The conversion of electrical signals into light signals taken place due to

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Generator

Transmitter

Receiver

None of these

In which situation does diffraction occur?

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a wave bounces back from a surface

a wave meets another wave to produce a new wave

a wave passes from one medium into another

a wave passes through an aperture

The viscosity of glycrine is

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0.019x10^-9 Nsm^-2

0.801x10^-6 Nsm^-2

6.29x10^-3 N-sm^-2

6.29x10³ Nsm^-2

Everything in the vastness of space is in a state of

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Rest

Motion

Perpetual motion

None of these

Sunlight is also partially polarized because of Earth's atmosphere due to scattering by

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Water vapours

Air particles

Dust particles

All of these

The quantity mr² is known as

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Moment arm

Moment of inertia

Moment of force

None of these

Longitudinal waves do not exhibit

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Refraction

Reflection

Diffraction

Polarization

Which of the following gives volts as its unit

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Current/resistance

Power x current

Rate of flow of charge

emf of a cell

Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as

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critical temperature

curie temperature

high temperature

fixed temperature

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

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