Question # 1

Totally reflecting prism is used in:

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Periscope

Binoculars

Periscope and binocular

Telescope

The loudness of a sound is most closely related to its:

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Frequency

Period

Wavelength

Amplitude

At extreme position potential energy of the pendulum is

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Maximum

Miimum

a and b

zero

Which gate is used for safety alarm:

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AND

NANAD

OR

NOR

The way of doing business by using web is called:

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Sources of entertainment

Web business

E-commerce

E-mail

When a heavy nucleus splits into lighter nuclei,the process would.

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Release nuclear energy

absorb nuclear energy

Release Chemical energy

Absorb Chemical Energy

The half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

The unit of intensity of sound:

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wm^-1

wm

wm^-2

wm^-3

Which is the unit of energy:

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KWh

Electron volt

Joule

All of above

Public address system is the example of :

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Analogue electronics

Digital electonics

Binary system

None of these

The time required to complete one round trip (vibration) abut mena position is called:

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Time period

Freqency

Amplitude

None of these

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate:

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The rod and the paper are oppositely charged

The rod acquires a positive charge

The rod and the paper have the same charges

The rod acquires a negative charge

The wave properties

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Reflection

Refraction

Diffraction

All of these

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