Question # 1

In 1950, physicists observed that in cathode ray tube a special type of rays produced from cathode, these rays were called:

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Cathode rays

X-rays

Alpha rays

Gamma rays

Which memory consists of integrated circuits?

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Primary memory

Audio cassette

Video cassette

Compact cassette

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

Which one is a safety device?

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Switch

Fuse

Circuit breaker

Both B and C

Specific resistance of silver = ________ x 10^-sOhm-meter

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5.25

2.75

1.69

1.62

The difference between the loudness of faintest audible sound and loudness of another sound is called:

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Pitch of sound

Quality of sound

Sound level

Intensity of sound

What is fitted in telephone receiver:

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Electromagnet

Diaphragm

Both a and b

None

In variable capacitor, dielectric medium is:

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Paper

Air

Mica

Ceramic

The number of lines of force in a magnetic field depends upon.

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Shape of coil

Sixe of coil

Magnet

Strength of field

How Galvanometer is connected in circuit to detect current:

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In series

In parallel

Fixed

Variable

Safe limit of radiations exposure in one year.

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4 rem

5 rem

3 rem

6 rem

If a neutral body is brought near to the electroscope its leaves:

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Diverge

Contract

Shut

Remain in normal position

The half life of radium 226 is

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1600 year

1610 years

1620 years

1630 years

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