Question # 1

A body of mass 5 kg is acted upon by a constant force of 20 n for 7 seconds. The total change in momentum will be:

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10 NS

100 NS

140 NS

200 NS

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

According to the law of conservation of linear momentum, the total linear momentum of an isolated system

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increases

decreases with time

remains constant

none of them

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

Significant figures in 0.2020 are:

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Two

Three

Four

Five

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is

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0.05 m

0.08 cm

0.8 m

0.008 m

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

The projectile is the motion which is

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One dimensional

Two dimensional

Three dimensional

None of these

Which Phenomenon proves that nature of light is transverse

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Interference

Diffraction

Scattering

None

A body of mass 10 kg is dropped to the ground from a height of 10 meters.The work done by the gravitational force is (g = 9.8 m/s²)

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-490 Joules

+ 490 Joules

- 980 Joules

+ 980 Joules

If the instant velocity does not change, the body is moving with a

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Initial velocity

Variable velocity

Uniform velocity

None of these

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Gaussian surface may be

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Spherical

Rectangular

Any shape

None of these

Which row is correct for fission and for fusion?

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Produces larger nuclei

Produces smaller nuclei

The body moving with uniform velocity may be

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in equilibrium

accelerating

changing in direction

changing in magnitude

SI unit of angular moment is

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Kgms^-1

Kgm²s^-2

Kgm²s^-1

Kgm³s^-1

The materials which are used in selective absorption method to polarize the light are

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chronic substances

organic substances

inorganic substances

diachronic substance

The SI unit of stress is some as that of:

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Pressure

Momentum

Impulse

Change momentum

Force

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