Question # 1

The contrast in the fringes in any interference pattern depends on

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Fringe width

Intensity ratio of the sources

Distance between the slits

Wavelength

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

A photocell with a constant p.d. of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1m, the electrons emitted by the photocell

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Carry 1/4th their previous energy

Are 1/16th as numerous as before

Are 1/4th as numerous as before

Carry 1/4th their previous momentum

Radio waves of constant amplitude can be generated with

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Rectifier

Filter

FET

oscillator

Which of the following is a scalar quantity?

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Density

Displacement

Torque

Weight

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton's. If the work done is 25 joules, the angle which the force takes with the direction of motion of the body is:

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0°

30°

60°

90°

A sun rise or sun set, the sun looks reddish because:

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

What is the average energy of N molecules of monoatomic gas?

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1/2 NKT

NKT

3/2 NKT

5/2 NKT

According to classical theory the proposed circular path of an electron in Rutherford model of atom will be

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Circular

Straight line

Parabolic

Spiral

Which of the following is the only vector quantity?

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Temperature

Energy

Power

Momentum

The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:

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Mass

Length

Time

None

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increases

Remains constant

First increases and then decreases

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The unit of inductance is equivalent to

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V x s/A

V x A/s

A x s/v

V/A x s

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

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