Question # 1

The number of neutrons in the nucleus of tritium is:

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1

2

3

4

The speed of sound in iron at 25°C is:

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5950 m/sec

5900 m/sec

6950 m/sec

6940 m/sec

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

The more negative potential of grid, the more electrons will be:

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Attracted

Repelled

Attracted as well as repelled

Neither attracted nor repelled

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly__________ to the wavelength of the wave:

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Two times

Equal

Four times

None of these

The distance of spherical mirror is called:

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Curvature

Aperture

Sphere

a,b

Which among the following radiation has more penetrating power?

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A beta pareticle

A gamma particle

An alpha particle

None of these

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10 m

15 m

17 m

20 m

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

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Boiling

Evaporation

Conduction

Thermionic emission

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

Bets can hear sound of frequency up to:

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100,000 Hz

25000 Hz

120,000 Hz

1000 Hz

A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage.

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0 V

30 V

45 V

60 V

Floppy has a storage capacity

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4-5 MB

3-4 MB

1-3 MB

3-6 MB

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