Question # 1

If the velocity of the body becomes double then its kinetic energy will:

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Remain the same

Become double

Become four times

Become half

Water on cooling below 4 ^oC begins to:

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Expand

Contract

Boils

None of these

Work is zero when "F" and "S" will be:

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Parallel

Perpendicular

Anti parallel

Tangent

Kinetic energy is possessed by a body by:

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Virtue of motion

Height

Rest

Nil

The Earth attracts a body with a force equal to its:

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Velocity

Gravity

Weight

Mass

O maximum height the P.E of the body is:

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Zero

Maximum

Minimum

None of these

Those objects which do not conduct electricity are called.

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Insulator

Semi conductor

Nil

Conduct

A black dull surface is a good ________ of heat:

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Emitter

Absorber

Reflector

Both A and B

Solar energy is a type of.

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Renewable

Non-renewable

Natural

None

A force of 10 N is making and angle of 30^owith the horizontal. Its horizontal component will bw:

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4 N

5 N

7 N

8.7 N

Sliding friction can be changed into rolling friction by using:

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Ball bearing

Roller bearing

Both a and b

None of these

Boolean expression for AND operation is:

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X = A̅

X = A + B

X = A . B

X = A̅B̅

Which type of image is produced by the converging lens of human eye if it views a distant object:

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminished

Virtual, inverted, magnified

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

When a body moves to and fro about a point its motion is called:

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Random motion

Linear motion

Vibratory motion

Rotatory motion

The refracted light striking to the side of prism is called:

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Refracted ray

Incident ray

Reflected ray

Emergent ray

Power of lens is:

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q/p

1/q

1/p

1/f

Which of the following is an insulator:

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Copper

Iron

Silk

Silver

What happens to the intensity of the brightness of the lamps connected in series as more and more lamps are added?

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Increases

Decreases

Remains the same

Can not be predicted

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

The direction of electric field lines due to positive charge is:

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A way from the charge

Towards the charge

Both a and b

None of these

If there is divergence of leaves by touching a body with electroscope then the body is:

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Semi conductor

Neutral

charge body

Insulator

A body starting from rest attains angular acceleration of 5 rad s-2 in 2 second final angular velocity will be.

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10 rad s-1

7 rad s-1

3 rad s-1

2 rad s-1

If the radius of droplet becomes half, then its terminal velocity will become.

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Double

Half

One fourth

Remains same

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

If the slope of the velocity time graph remain constant then body is moving with.

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Uniform velocity

Negative variable acceleration

Variable acceleration

Uniform acceleration

The frequency of waves produced in microwave oven is

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1435 Hz

2450 MHz

1860 MHz

2850 Hz

The relation between the speed and hoop can be written as

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2

4

1/2

1/4

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

If a stretched string 4 m long and it has 4 loops of stationary waves, then the wave length is.

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1m

2 m

3 m

4 m

The frictional effect between the different layers of fluid is called

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Terminal velocity

Stock's law

Viscosity

Surface tension

The unit of rotational K.E. is

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rAD/SEC

Js

J

Kgm2

Biomas is a potential source of

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Renewable energy

Non renewable energy

Botha a and b

Tidal energy

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

When charge particle enter perpendicular to magnetic field, the path followed by it is:

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A helix

A circle

Straight line

Ellipes

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

Which type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf