Question # 1

In the force applied to parallel to the direction of motion, then the work done is:

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Positive

Negative

Zero

None of these

The neighbours of every molecule in crystalline solids are arranged in

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an irregular manner

a regular manner

any manner

none of them

The nature of radiations emitted by a hot body depends upon its:

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Metarial

Temperature

colour

Volume

Length

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

de-Broglies hypthesis was experimentally verified by

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Maxwell

Compton

Einstein

Davison and Germer

When a conductor is moved across a magnetic field, the redistribution of charge sets up:

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Magnetic field

Electrostatic field

Electromagnetic field

All of these

None of these

The process which is carried out at constant temperature is known as

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adiabatic process

isothermal process

isochoric process

none of them

Heating effect of current utilized in:

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Electric motor

Electric toaster

Electroplating

Electric kettle

Both (B) and (D)

If work is done at the rate of 2 k j per second, then total work done is half an hour will be:

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0.5 Kwn

2 Kwh

1 Kwh

None of these

The results of spectra obtained by Blamer were expressed in 1896 by

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Bohr

Rydberg

Planck

Rutherford

Coulomb

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

The typical speed of reconnaissance jet (SR-71) is

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900 ms^-1

950 ms^-1

980 ms^-1

990 ms^-1

An ordinary glass gradually softens into a paste-like state before it becomes a very viscous liquid. It happens almost at:

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800°C

500°C

300°C

100°C

None of these

The distance to the nearest galaxy is

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10²⁰ m

10²⁹ m

10³⁰ m

10³¹ m

In a uniform circular motion

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Velocity and acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

Only velocity change acceleration remain constant

A force of 10 N displace an object by 10 m.If work done is 50 J then direction of force makes an angle with direction of displacement.

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120°

90°

60°

None of these

Einstein predicted the shift of light by sun coming from star towards Earths was the same as during the solar eclipse in 1919 is

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Φ = 1.235 sec of angle

Φ = 1.367 sec of angle

Φ = 1.693 sec of angle

Φ = 1.745 sec of angle

Assuming the earth to be a sphere of radius 6400 km. What is the value of acceleration due to gravity at a height of 800 km above the surface of the earth ?

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5.35 ms^-1

6.35 ms^-2

7.35 ms^-2

8.35 ms^-2

Heat is a form of

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Power

Work

Energy

Motion

To find wavelength of light by his experiment. Newton utilized:

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Principle of phase change

Snell's Law

Bragg's law

Both (A) and (C)

The axis of ration of an object will not change its orientation unless

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Internal torque acts

Internal torque acts in one direction

External torque acts

None of these

The curie temperature for iron is

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750°C

570°C

750°k

57°K

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