Question # 1

Shining silvered surface is a best:

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Emitter

Absorber

Reflector

None of these

The force with which Earth attracts the object towards its center is known as

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Force

Weight

Mass

Gravity

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

Which one of the following units is not a derived unit?

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Pascal

Kilogram

Newton

Watt

Breaking system in vehicles depends upon:

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Pascal's law

Hook's law

Archimedes law

Principle of floatation

The amount of heat absorb by body depends on the :

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Colour of the surface

Nature of surface

Texture of surface

Both A and B

Plasma is a gas which consists of:

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Negative ions

Positive ions

Neutral ions

All of htese

The device that is used to measure the temperature of a body called

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Thermometer

Acidimeter

Barometer

Clock timer

The value of sin θ at an angle of 60o is

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0.5

0

0.707

0.866

PQ & RS are 2 parallel forces moving in same direction than they are called ............... forces.

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Like parallel

Unlike

Parallel

Nil

The unit of stress is:

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Newton

Pascal

Nm^-2

m³

The maximum displacement from mean position is called:

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Maximum height

Time period

Amplitude

Intervel

the power of washing machine is:

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700 W

750 W

650 W

800 W

Which among the following radiation has more penetrating power?

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A beta pareticle

A gamma particle

An alpha particle

None of these

An example of input device computer is:

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Keyboard

printer

monitor

RAM

Which of the following is an example of simple harmonic motion ?

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Motion of the simple pendulum

The motion of ceiling fan

The spining of the Earth on its axis

A bouncing ball on a floor

The time period of mass attached with a spring can be calculated by:

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T = 2π√L/g

T = 1/T

T =2π√g/L

T = 2π√m/k

The sensation of sound persists in our brain for:

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0.1 sec

0.01 sec

1 sec

10 sec

In electrostatic all charges are in:

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The same direction

Opposite direction

Motion

Static state

If the length of a simple pendulum is halved its time period will become:

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T/2

T = T/√2

√2T

2T

The screen of a cathode ray tube consists of a thin layer of:

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Sodium

Nitrogen

Oxygen

Phosphorus

Two charged spheres are separated by 2 mm. Which of the following would produced the greatest attractive force?

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+1 q and +4q

-1 q and -4q

+2 q and +2q

+2 q and -2q

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

On loading the prong of a tuning fork with wax, the frequency of sound.

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Increases

Decreases

Remains same

First increases then decrease

In case of point source the shape of wave front is.

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Plane

spherical

Circular

Eliptical

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

Efficiency of a heat engine working between 27 ^oC and 32 ^oC will be.

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50%

90%

40%

62%

The frictional force is

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Conservative force

Non conservative force

Electric force

Magnetic force

A force of 100 N makes on angle of 60^owith y axis, its horizontal component is.

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50 N

60 N

70.7 N

86.6 N

The dimension of viscosity are

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[M2L-2T2]

[M-1LT-1]

[M-1L-1T]

[ML-1T-1]

The shortest distance between two points is called

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Distance

Amplitude

Displacement

Is a number

In S.H.M, the acceleration of the body is directly proportional to

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Weight of body

Applied force

Amplitude

Displacement

The SI unit of angular displacement is.

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Degree

Revolution

Radian

Rotation

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

The sensitivity of galvanometer is given by

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CAN/B

C/BAN

BAN/C

BN/CA

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

A two inputs NAND gat with inputs a and b has an output '0' if.

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B is zero

A is zero

Both A and B are 1

Both A and B are '0'

Cobalt -60 is the source for

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Alpha rays

Gama rays

Beta rays

Neutron

In order to increase sensitivity of galvanometer the value of C may be

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Increase

Decrease

Neither increase nor decrease

Remain same

Kirchhoff's first rule is the manifestation of the law of conservation of.

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Mass

Charge

Energy

Momentum

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect