Question # 1

Application of electrostatic is:

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Car painting

Photocopying

Extracting of dust

All of these

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

diamond des not conduct electricity, because it has no:

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free electrons

free protons

free neutrons

free positive charge

Astronauts is space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space.

Sound waves travel very fast in speace

Sound waves cannot travel in space

Sound waves have low frequency in space

Time period is reciprocal of:

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Frequency

Cycle

Wavelength

Amplitude

The direction of electric field lines due to positive charge is:

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A way from the charge

Towards the charge

Both a and b

None of these

In computer terminology information means.

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any data

raw data

processed data

large data

In A.C. generator flux will be zero if coil is to the field.

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90^o

45^o

Parallel

Inclined

Which technology is used in mobile phone:

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Heat

Radio

Light

Laser

First voice signal was transmitted in the form of electrical signal in:

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1870

1875

1876

1880

The product of frequency and wavelength is equal to:

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Time period

Amplitude

Wave speed

Wave energy

with the increase in temperature the resistance of pure metals:

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increases

decreases

remains same

none of these

Iron core is used in tranformer to:

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Enhance the flux

Decrease the flux

Keep flux the same

botha a and b

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