Question # 1

The insulator of heat is:

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Cork

Cotton

Wood

All

The quantities that describe completely by magnitude and direction are.

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Scalar

Vector

Base

Derived

Gravitational constant depends on:

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Medium

Force

Weight

It does not depend son anything

Convection of heat is the process of heat transfer due to the

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Random motion of molecules

Downward movement of molecules

Upward movement of molecules

Free movement of molecules

If Fy = 4 N and Fx = 3 N , what is the magnitude of resolution of force.

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5 N

7 N

10 N

15N

the to and fro motion of a body about its mean positionis called.

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Circular motion

Random motion

Rotatory motion

Vibratory motion

The slope of distance time graph shows.

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Speed

Displacement

Acceleration

Distance

If we increase the length of spanner the torque produced will be

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Increased

Decreased

Constant

Zero

Gravitational force is a

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Contacted force

Non-contact force

Electrical force

Charging force

if a body of a mass 'm' is moving with velocity 'v' then its K.E. is given by

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K.E. = 1/2 mv

K.E. = 1/2 mv2

K.E. = mv2

K.E. = 1/2 m2v

Waking on earth is the example of

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1st law of motion

Second law of motion

Third law of motion

Law of Momentum

Which of the following is a method of energy transfer.

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Conduction

Reatiation

wave motion

all of these

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

The technique or method used to absorb undesirable sounds by soft and porous surface is called:

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Ultrasonic

Acoustic protection

Infrasonics

Echo

When 1 tonne of coal is burnt then amount of energy is released .

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36 x 10⁸ J

36 x 10⁹J

36 J

36 x 10¹⁰J

Sound waves are an example of:

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Transverse waves

Electromagnetic waves

Longitudinal waves

All of these

The rating of a fuse wire is always expressed in:

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ampere-hours

KWh

Volts

Amperes

1 Pico Farad is equal to:

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10^-9F

10^-12F

10¹²F

10^-6F

Power of lens is:

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q/p

1/q

1/p

1/f

In computer terminology information means:

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Any data

Raw data

Processed data

Large data

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral charge

Repels a neutral chage

The example of magnetic disk is:

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Compact disk

Floppy disk

Audio cassette

Video cassette

The waves used in radar speed trap are

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Longitudinal

Sound wave

Micro waves

Matter waves

Bright fringes are also called as

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Minima

Maxima

Wave front

Ray of light

When a fore of 100 N is acting on an object along x-axis then its vertical component will be.

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50 N

0 N

25 N

10 N

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

Radar system is an application of.

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Chemical effect

Electric effect

Magnetic effect

Doppler's effect

The device used for measurement of liquid flow is.

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Manometer

Barometer

Hydrometer

Venturimeter

A 60 kg man in an elevator is moving upward with an acceleration of 9.8 ms-2. The apparent weight of the man.

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Increase

Decreases

Remain constant

Becomes zero

If a body is moving in the counter clockwise direction the direction of angular velocity will be

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Toward the centre

Away from the centre

along the linear velocity

Perpendicular to both radius and linear velocity

The light energy travels in space as waves was firstly proposed by

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Maxwell

Young

Einsten

Hydrogen

The mathematical expression for the restoring force is.

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F = kx

F = ma

F = dp/dt

F = -kx

In three phase A.C. generator the phase difference between each pair of coil is.

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45^o

90^o

120^o

60^o

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

The number of Isotopes of cesium are.

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4

32

22

36

The mass spectrum of naturally occurring neon shows the most abundant isotope has atomic mass.

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19

20

21

22

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

The Kirchhoff 1^st rule is manifestation of:

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Law of conservation of mass

Law of Conservation of charge

Law of conservation of energy

None of above

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

Which consumes small power.

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Inductor

Resistor

Motor

All of these