Question # 1

Totally reflecting prism turns the incident ray at an angle of:

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90^o

60^o

75^o

45^o

The speed of sound in are water at 25°C is:

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1530ms-1

1531ms-1

1560ms-1

1570ms-1

The distance between two consecutive compressions or rarefactions in longitudinal waves is called:

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Amplitude

Wavelength

Half wavelength

1/4 wavelength

A device which has two way communication is:

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Television

Radio

Hard disk

Mobile phone.

The S.I unit of potential difference is:

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Ampere

Coulomb

Volt

Watt

What is fitted in telephone receiver?

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Electromagnet

Diaphragm

Both a and b

None of these

What is the direction of the magnetic field lines inside a bar magnet?

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From north pole to south pole

From south pole to north pole

From side to side

There are no magnetic field lines.

The unit of intensity of sound:

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Wm^-1

Wm^-2

Wm

Wm²

Which rays are used to send or receive digital information along aptical fibre:

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infrared

alpha rays

beta rays

mechanical

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

In NOT gate number of input terminals is/are:

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1

2

3

4

Which component is output device of computer?

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CPU

C.D

Keyboard

Monitor

The unit of potential difference is:

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Volt

Coulomb

Ampere

Joule

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