Question # 1

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

When a bicycle is in motion, the frictional forces exerted by the ground are

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In the forward direction on both the wheels

In the backward direction on both the wheels

In the forward direction on the front wheel and the backward direction on the rear wheel

In the backward direction on the front wheel and the forward direction on the rear wheel

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

When a conductor is moved across a magnetic field, the redistribution of charge sets up:

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Magnetic field

Electrostatic field

Electromagnetic field

All of these

None of these

Avo-meter is used of measure the

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current, voltage

voltage, resistance

resistance, current

current, voltage and resistance

Circular motion is an example of motion in:

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One dimension

Two dimensions

Three dimensions

None of these

If a body reaches a speed equal to the speed of light, then its mass will became

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zero

very small

infinity

none of these

Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is

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45°

60°

50°

40°

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

The energy of the 4th orbit in hydrogen atom is

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2.5 ev

- 3.5 ev

-0.85 ev

-13.6 ev

Weber is a unit of

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magnetic flux

magnetic filed intensity

magnetic induction

magnetic flux density

The blending of light when it passes from one medium to another is known as:

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Refraction

Interfarance

Polarization

Both (B) and (C)

For the normal setting of a telescope

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Only the object is at infinity

Only the final image is at infinity

Both the object and the final image is at infinity

Neither the object nor the final image has to be at infinity

For a gas obeying Boyle's law, if the pressure is doubled the volume becomes:

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One half

Double

Four times

None of these

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

The resolving power of telescope depends on

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Focal length of eye lens

Focal length of objective lens

Length of the telescope

Diameter of he objective lens

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

The angular momentum is a vector quantity with due

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Perpendicular to the axis of rotation

Along the axis of rotation

At the axis of rotation

None of these

The petrol engine works on the basis of

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Kelvin statement

Clausius statement

Carnot cycle

First law of thermodynamics

Which of the following quantities is a vector

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Volume

Temperature

Displacement

Density

A thin film is a transparent medium whose thickness is comparable with the wavelength of

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light

sound

any one of them

none of them

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