Question # 1

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

A 220 V, 50 Hz, AC source is connected to an inductance of 0.2.H and a resistance of 20 ohm in series What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

If a diamagnetic substance is brought near north or south pole of a bar magnet it is

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Attracted by the poles

Repelled by the poles

Repelled by north pole and attracted by the south pole

Attracted by the north pole and repelled by the south pole

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

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

In which of the following states does the incandescent substance give continuous spectrum?

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Vapours in atomic state

Vapours in molecular state

Solid or fluid in bulk state

Solid or fluid in plasma state

The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (β) The resulting nucleus is

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₇N¹⁴

₅B¹³

₇N¹³

₆N¹³

With the propagation of a longitudinal wave through a material medium the quantities transmitted in the propagation direction are

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Energy momentum and mass

Energy

Energy and mass

Energy and linear momentum

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^-1 towards 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

The velocity of falling raindrops attains limited value because of

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Up thrust of air

VIscous force exerted by air

Surface tension effect

Air currents atmosphere

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