Question # 1

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

The magnitude of resultant of three vectors is 3. Its x-component is one, y-component is two, then its z-component is:

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0

1

2

3

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

Their time of flight will be same

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

Electrostatics is the branch of physics which deals with the study of electro charges:

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At rest

At rest under the action of electric forces

In motion under the action of electric forces

In motion

At rest under the action of nuclear forces

When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

Light year is a unit of:

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Time

Distance

Velocity

Intensity of light

A ball is dropped downwards After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds

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25 m

20 m

50 m

9.8 m

A body moving with uniform velocity has

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positive acceleration

negative acceleration

infinite acceleration

zero acceleration

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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pair production

photoelectric effect

Compton effect

None of these

A physical quantity which has both magnitude and direction but does not satisfies parallelogram law of addition

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Must be a vector

May be both scalar and vector

Scalar

None

The higher the satellite, the slower will the required speed and will complete one revolution in time

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Smaller

Very very longer

Longer

None of these

There are earth stations which transmit signals to satellites and receive signals via satellite from other countries are

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200

Over 200

400

500

The temperature of sun is measured with

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Platinum thermometer

Gas thermometer

Vapour pressure thermometer

Pyrometer

The modulus of elasticity of material does not depend upon

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Shape

Temperature

Nature of material

Impurities mixed

The energy required to charge a capacitor of 5 μF by connecting D.C source of 20 kV is

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10 kJ

5 kJ

2 KJ

1 kJ

The internal energy depends on

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Path

Initial and final states of the system

Time

None of these

In projectile motion when a body is projected upward it must have

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Initial velocity

Angle θ < 90^o

Falling under gravity

All of these

Optical device used in spectrometer

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Simple microscope

Compound microscope

Telescope

Any of them

Rain drops are spherical because of

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Gravitational force

Surface tension

Low viscosity of water

Air resistance

The critical temperature of aluminum is

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1.18 K

4.2 K

3.72 K

7.2 K

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