Question # 1

In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

all 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

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

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Push against the air

React against the rocket and push it up

Heat up the air which lifts the rocket

Push against the earth

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

Proton was discovered by Rutherford in

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1915

1906

1910

1920

A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of

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3 s

5 s

7 s

9 s

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of these

The speed of sound in a medium depends on

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The elastic property but not on the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

In a transistor, the central region is called

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collector

emitter

base

none of them

Young's modulus for lead is

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10

11

15

19

Which of the following light move faster in water

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Red

Violet

Green

Blue

Stoke s law is applicable to

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Very fast moving objects only

Only stationary objects

Slow moving objects

All

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

In a photocell, cesium coated oxidized silver emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

The sky appears blue because

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Red light is absorbed

Blue light is scattered the most

Blue light is absorbed

It is its natural color

Fluid friction of a spherical body depend on the

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Shape

Size

Orientation

All of these

The positions of two aeroplanes at any instant are at A (2, 3, 4) and B(5, 6, 7) from the origin in km. Find the distance between the two aeroplanes.

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3.2 Km

4.9 Km

5.0 Km

5.2 Km

One day is equal to

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5 × 10⁷ sec

6.6 × 10⁴ sec

9.3 × 10³ sec

None of these

The image formed by an eyepiece of compound microscope is

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Real and diminished

Real and enlarged

Virtual and enlarged

Virtual and diminished

SI unit of potential difference is volt it can be written as

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JC^-2

JC^-1

JC

J.A

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