Question # 1

The half life of a radio-isotope is 5 years The fraction of atoms decayed in this substance after 15 years will be

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1

3/4

7/8

5/8

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

The mass defect for the nucleus of helium is 0.0303 a.m.u What is the binding energy per nucleon for helium in MeV?

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28

7

4

1

A photoelectric cell converts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

Surface tension of water is due to

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Inter molecular attraction

Intermolecular spaces

Inter molecular repulsion

None of above

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

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

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

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