Question # 1

The unit of frequency is:

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Heartz

Vibration per second

Cycle per second

all a, b, c

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

Which of the following quantities is not change during refraction of light?

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Its direction

Its speed

its frequency

Its wavelength

Which component is output device of computer:

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CPU

C.D

Keyboard

Monitor

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

If the potential energy of none coulomb charge is one joule then its potential will be:

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5 volt

2 volt

3 volt

1 volt

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Lens

Mirror

Which statement of the following is false for primary memory?

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The base of primary memory is electronics

This is a random access memory

It gets lost when computer switches off

It is built on laser technology

When the object is placed beyond 2F of a convex lens, the image formed will be:

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Real, inverted and smaller than the object

Real, inverted and of the same size as the object

Real, inverted and larger in size than the object

Virtual, erect and larger in size than the object

The speed of sound is air at 21 ^oC is:

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336 ms^-1

343 ms^-1

430 ms^-1

470 ms^-1

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

Two uncharged objects A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of these statements is true about object A.

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredicatable

a fuse is connected in series with:

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neutral wire

live wire

earth wire

cable wire

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