Question # 1

Radioactive isotopes present in atmosphere is

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Cobalt -60

Ph-32

Carbon -14

Carbon -20

That period in which voltage repeats its value in equal intervals is called:

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cycle

Time period

Frequency

Amplitude

The symbol of AND operation is:

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+

-

.

*

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

The example of shock absorber of the vehicles are:

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Simple harmonic motion

Vibratory motion

Damped motion

Linear motion

The sensation of sound persists in our brain for:

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0.1 sec

0.01 sec

1 sec

10 sec

Sound waves are an example of:

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Transverse waves

Electromagnetic waves

Longitudinal waves

All of these

electric field is weak when:

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lines are far apart

lines are close together

no lines are present

lines are directed outside

Image formed on a camera is:

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Real, inverted, and diminished

Virtual, upright and diminished

Virtual, upright and magnified

Real, inverted and magnified

If a charged body is brought near a negatively charged electroscope and the leaves of electroscope diverge, then the body is:

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Positively charged

Negatively charged

Neutral

None of these

Which is used to investigate the properties of electron beam:

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LDR

Electroscope

Proton gun

Electron gun

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

The converter of analogue to digital signal is:

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ADC

DAC

ATDC

None of these

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