Question # 1

A 220 V, 50 Hz. A.C. 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

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

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

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

The peak voltage in 220 volt A.C. supply is nearly

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220 volt

253 volt

311 volt

440 volt

The incorrect statement regarding the lines of force of the magnetic field B is

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Magnetic intensity is a measure of lines of force passing through unit area held normal to it

Magnetic lines of force form a close curve

Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole

Due to a magnet magnetic lines of force never cut each other

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE+PE remains constant

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

A particle moving in a magnetic field has increase in its velocity, then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

The force between two charges 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

A wire is stretched to double of its length. The strain is

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2

1

zero

0.5

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

The length of a telescope is 36 cm. The focal lengths of its lenses can be

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30 cm, 6 cm

-30 cm, -6 cm

30 cm, -6cm

-30cm, 6cm

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