Question # 1

When a hydrogen atom is bombarded the atom is excited to the n = 4 state of hydrogen atom.The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

Which one of the following is a simple harmonic motion?

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Wave moving through a string fixed at both ends.

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed.

A 50-volt battery is connected across 10-ohm resistor.The current is 4.5 A.The internal resistance of the battery is

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Zero

0.5 Ω

1.1 Ω

5.0 Ω

For obtaining appreciable extension the wire should be

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Short and thin

Long and thin

Short and tick

Long and thick

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

When sound waves travel from air to water which of these remains constant?

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Velocity

Frequency

Wavelength

All the above

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

At a certain instant a stationary transverse wave is found to have maximum kinetic energy the appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of above

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

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

For obtaining appreciable extension, the wire should be

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Short and thin

Long and thin

Short and thick

Long and thick

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

The essential distinction between X-rays andγ-rays is that

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γ-rays have smaller wavelength than X-rays

γ-rays emanate from nucleus while X-rays emanate from outer part of the atom

γ-rays have greater ionizing power than X-rays

γ-rays are more penetrating than X-rays

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot flies at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

Steel is preferred for making springs over copper. Why?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely ot be oxidized

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

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