Question # 1

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

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Increase

Decrease

Remain F

Become 10F/9

A galvanometer is an instrument used to

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measure voltage across a circuit

detect current in a circuit

measure current flowing through a circuit

none of these

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

The disorder in the system increases due to the

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removal of heat

addition of heat

removal or addition of heat

none of them

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

The current that flows through the coil of a motor causes:

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shafts to rotate

None of these

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

Ethanol (alcohol) is a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

The error may occur due to:

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Negligence

Faulty apparatus

Inappropriate method

all of these

The velocity of a body at some particular instant is called

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Initial velocity

Instantaneous velocity

Variable velocity

None of these

In projectile motion when a body is projected upward it must have

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Initial velocity

Angleθ<90°

Falling under gravity

All of these

The dielectric constant K of an insulator cannot be.

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3

8

6

∞

The viscosity of fluid is described by

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Resistive forces of fluid

Frictional effect between different layers of a fluid

Flowing speed of fluid

None of these

Average acceleration is the difference of two vectors divided by a scalarΔt. Therefore

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The modulus of elasticity of material does not depend upon

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Shape

Temperature

Nature of material

Impurities mixed

A science student takes 100 observations in an experiment Second time he takes 500 observations in the same experiment By doing so the possible error becomes

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5 times

1/5 times

Unchanged

None of these

A convex lens has focal length F.An object is placed at P then

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Image is formed at + ∞ and is real

Image is formed at + ∞ and is virtual

Image is formed at + ∞ and is real

Image is formed at + and is virtual

The pressure P of a gas at constant temperature varies with its density P

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Directly

Inversely

Equal

None of these

The study of atomic structure of crystals by X-rays was initiated by W.H.. Bragg and W.L. Bragg in

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1920

1926

1910

1914

An object moving with acceleration g is said to fall freely identify freely falling objects from the list given below

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An orange falling from a tree

A satellite orbiting around the earth

A football kicked in the air

All of these

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