Question # 1

The resistance of a conductor does not depend on its

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mass

resistivity

length

cross-sectional area

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

When a body is moving with uniform positive acceleration, the velocity- time graph is a straight line. Its slope is

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zero

negative

positive

non-existing

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

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negative charges

positive charges

protons

electrons

Work is a scalar product of

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Force, Velocity

Velocity, Displacement

Force, Displacement

Force, Momentum

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

none of them

Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to

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Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

The focal length of convex lens having magnifying power of 5.55 is:

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5.5 cm

5 cm

4.5 cm

6 cm

The practical use of services by optic fiber is

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Two way television

World processing

Image transmitting and receiving equipment

All of these

Period of vibration of an atom in a solid is

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1 × 10^-10 sec

_{1 × 10}^-13_sec

1 × 10^-16 sec

1 × 10^-19 sec

Two wires of the same material have diameters in the ration 2 : 1 if they are stretched by the same force their elongations will be in the ratio

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8 : 1

1 : 8

2 : 1

1 : 4

The ratio of the atomic radius to nuclear radius is

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10⁴

10^-4

10²

10^-2

Work done by 1kg of water when it falls through the height of 10m is

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98 j

9.8 j

100 erg

9800 erg

The effect is to increase the inflation the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

Which of the following is unit of energy

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g cms^-2

Kilowatt

Watt day

Js^-1

High temperature water with pressure, come to the surface as

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Hot springs

Geysers

Steam vents

All of these

When the length and area of cross-section both are doubled, then its resistance:

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Will become half

Will remain the same

Will be doubled

Will become four times

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

In an isothermal process

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Volume remains constant

Pressure remains constant

Temperature remains constant

None of these

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