Question # 1

The value of refractive index of water is:

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2.33

1.36

1.33

1.39

The minimum value of angle of deviation is called:

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Minimum angle

incident angle

angle of minimum deviation

None of these

The S.I unit of intensity of sound is:

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Wm

Wm2

Wm-2

Wm-1

To get a design on the computer screen by moving a pointer with the help of mouse is called:

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word processing

graphic designing

data managing

telecommunication

Power of convex lens is 10 D. Its focal length is:

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100 m

10 m

1 m

0.1 m

Radiation was found in:

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1896

1895

1897

1898

The ray of light striking to the side of prism is called:

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refraction ray

incident ray

reflected ray

emergent ray

A device which has two way communication is:

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Television

Radio

Hard disk

Mobile phone.

the unit of frequency is:

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hertz

vibration per second

cycle per second

all a, b and c

Radioactive isotopes present in atmosphere is

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Cobalt -60

Ph-32

Carbon -14

Carbon -20

The Half life of a certain isotopes is 1 day. What is the quantity of isotopes after 2 days?

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One half

One quarter

One eight

None of these

Which process is involved to store charge in capacitors:

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Rubbing

Electrostatic induction

Conduction

Electromagnetic induction

How does sound travel from its source to your ear:

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By changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

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