Question # 1

The process by which electrons are emitted by a hot metal surface is

known as:

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Boiling

Evaportion

Conduction

Thermionic emission

isotopes are atom of same element with different.

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Atomic mass

Atomic number

Number of proton

Number of electron

Which types of image is formed by a concave lens on a screen?

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Inverted and real

Inverted and virtual

upright and real

Upright and virtual

Which radiations are free of effect of electric and magnetic field?

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Alpha

Beta

Gamma

Alpha and beta

The 1st practical electric battery is known as:

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Voltaic

Pile

Voltaic pile

Voltaic cell

The lines will be in the form of concentric circles, if conductor is:

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Circular

Straight

Solenoid

None of these

The critical angle for glass to:

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24^o

48^o

42^o

50^o

The converter of analogue to digital signal is:

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ADC

DAC

ATDC

None of these

In a vacuum all electromagnetic waves have the same:

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Speed

frequency

amplitude

wavelength

The value of acceleration is simple harmonic motion at mean position is:

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Maximum

Zero

10 N

Both a and b

How Galvanometer is connected in circuit to detect current?

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In Series

In Parallel

Fixed

Variable

Specific resistance of aluminium in (10^-8 Ω.m) is:

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1.7

2.75

5.25

1.69

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

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