Question # 1

Two sound waves of slightly different frequencies propagating in the same direction produce beats due to

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Interference

Diffraction

Polarization

Refraction

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

The value of threshold frequency for different metals is

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different

same

may be different or may be same

none of these

Absolute temperature can be calculated by

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Means squares velocity

Motion of the molecule

Both A and B

None of these

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

The photon of radio-waves has energy of about

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1 Me V

1 Ke v

10^-10e v

10¹⁰e v

When the pn-junction is forward biased. the current flows through it is of the order of

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mili-amperes

amperes

nano-amperes

micro-amperes

The travel time of light from Moon to Earth is

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2 min 10 sec

1 min

1 min 20 sec

3 min 30 sec

Einsteins theory say that gravity

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Follows inverse square law

Donot follow the inverse square law

Very weakly follow inverse square law

None of these

IF the spinning speed of the earth is increased then the weight of the body at equator

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Does not change

Doubles

Decreases

Increases

If N is the number of rulings on the grating, then the resolving power in the mth order diffraction equals to

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R = N × m

R = N/m

R = m/N

R = N × m²

In YDS experiment, fringe spacing means the distance between two consecutive_____fringes:

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Bright

Dark

Any of A or B

None of these

Blood vessels are

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Like solids

Rigid

Not rigid

None

Rocket engines lift a rocket from the earth surface because hot gas with high velocity

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Push against the earth

Push against the air

React against the rocket and push it up

Heat up the air which lifts the rocket.

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

As this temperature scale is independent of the working substance, therefore can be applied at

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High temperature

Low temperature

Very low temperature

None of these

In case when there is not total displacement and average velocity, then the motion is described by

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

The smallest part of a crystal lattice is called:

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A molecule

An atom

A unit cell

A particle

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