Question # 1

The unit of spring constnat is:

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m

kg

Nm²

Nm^-1

If Current flowing through switch then the output is expressed as:

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0

1

-1

2

Astronauts is space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space.

Sound waves travel very fast in speace

Sound waves cannot travel in space

Sound waves have low frequency in space

the resistance of conductor is inversely to:

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temperature

length

area of cross section

pressure

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

The symbol of atomic mass number is:

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A

X

N

Z

When resistances are connected in series the current passing through them is:

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Different

Zero

The same

None of these

the part of waves at which particles of the medium are below the normal position are called:

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extreme position

crest

trough

compression

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

The half life of argon nuclide Ar-40 is:

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2 x 10⁸years

2 .2x 10⁸years

2.4x 10⁸years

2.8x 10⁸years

Joule’s law is W=

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IR/t

IRt²

IR²t

I²Rt

The amount of current that causes the loss of muscle control is:

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0.1A

0.015A

2A

1A

Safe limit of radiations exposure in one year.

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4 rem

5 rem

3 rem

6 rem

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