Question # 1

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Free electrons are

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tightly bound

fixed

loosely bound

tightly fixed

The SI unit of spring constant is identical with that of:

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Force

Surface tension

Pressure

Loudness

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

With increase of temperature, the viscosity of liquid and gases

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Increases for both

Decreases for both

Increases for liquids and decreases for gases

Decreases for liquids and increases for gases

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

Moment of inertia depends upon:

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Mass

Selection of axis of rotation

Both of them

None of these

The electric flux is linked with a surface will be maximum when

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The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45° with the electric field

All of the above

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

The shortest distance between two points directed from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

In a transistor, if the central region is n-type, then this type of transistor is known as

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n-p-n transistor

p-n-p transistor

either of these

none of these

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Inertial frame of references are those frame of references which are moving with

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increasing velocity

decreasing velocity

constant velocity

all of them

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

A voltmeter is used to measure the

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potential difference

current

temperature

resistance

In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is

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Same

2 times

4 times

8 times

The SI unit of electric field intensity is

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CN^-1

NC^-1or Vm^-1

JC^-1

AV^-1

The unit of resistance is

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volt

ampere

ohm

coat

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of these

Hertz is unit of:

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Time period

Displacement

Amplitude

Frequency

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

The neighbours of every molecule in crystalline solids are arranged in

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an irregular manner

a regular manner

any manner

none of them

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

What is another name for laminar flow?

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streamline

unsteady flow

turbulent flow

both (a) and (b)

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

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