Question # 1

The current in LCR circuit will be maximum whenωis

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As large as possible

Equal to natural frequency of LCR system

The percentage of available heat energy converted into work by a petrol engine is roughly

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35 %

40 %

35 to 40 %

25 %

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Velocity of sound in vacuum (in m/s) is

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330

1000

156

0

A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is

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minimum

maximum

zero

none of these

If two forces of magnitudes 3.5 and 2.5 N act on a body such that the angle between the forces is zero, then magnitude of the resultant will be:

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1.0 N

6 N

3.5 N

12 N

Lenz's law is the consequence of

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Mass

Energy conservation

Momentum conservation

Charge

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

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Greater than

Equal to

Smaller than

None of these

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

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60°

90°

120°

180°

The length contraction happens only

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Opposite to the direction of motion

along the direction of motion

perpendicular to the direction of motion

In any direction

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

On applying a stress of 20 x 10⁸Nm^-2, the length of perfectly elastic wire is doubled. Its young' modulus is

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40 x 10⁸N/m²

20 x 10⁸N/m²

10 x 10⁸N/m²

5 x 10⁸N/m²

If the earth were to rotate faster than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decreases at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

A convex lens of focal length 5 cm is used as magnifying glass Its magnifying power when the image is formed at infinity

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6

5

1.5

7

A compound microscopes consists of objective of

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Very short focal length

Large focal length

Very large focal length

None of these

The cause of power loss in optic fibre is

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Absorption

Scattering

Dispersion

All

When a force is applied on a body, several effects are possible. Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

How much deep inside the earth (radius R) should a man go so that his weight become one-fourth of that one earth's surface?

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R/4

R/2

3R/4

None of these

Who gave the idea of light as wave ?

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Newton

Huygen

Thomos Young

Bragg

For a incompressible fluid its

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Density is constant

No internal friction is present

Velocity is constant

All of these

In diffraction grating has feature/features like

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A glass plate

A large numbers of lines are ruled

Spacing between two lines acts as a slit

All of these

The eye piece of a compound microscope acts as a

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Diverging lens

Converging lens

Diverging mirror

Converging mirror

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