Question # 1

Which is not an e.m.f source:

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Generator

Solar cell

Battery

Rheostat

Which radiations are free of effect of electric and magnetic field?

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Alpha

Beta

Gamma

Alpha and beta

The frequency of silent whistle is:

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20,000 Hz – 25000Hz

2000 Hz – 2500Hz

200 KHz – 2000 Hz

25000 KHz

If focal length of a lens is 1m, then its power will be:

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1 D

0.5 D

1.5 D

1 D

In totally reflecting prism one angle is of 90°, and other two angles are of:

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30°,30°

45°,90°

45°,45°

40°,40°

Which is the unit of energy:

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KWh

Electron volt

Joule

All of above

The speed of sound in air at 0°C is:

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331ms^-1

376ms^-1

231ms^-1

386ms^-1

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

In totally reflecting prism one angle is of 90^o, and other two angles are of:

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30^o,30^o

45^o,90^o

45^o,45^o

40^o,40^o

The frequency of silent whistle is:

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20,000 Hz - 25000 Hz

2000 Hz - 25000 Hz

200 Hz - 2000 Hz

25000 Hz

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

The amount of current that can be painful is:

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0.005A

0.001A

1A

2A

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