Question # 1

When the conductor moved across a magnetic field:

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Emf induced is similar to that of a battery

Emf induced gives rise to induced current

An emf induced across its ends

All are correct

None of these

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

The relation between charge 'Q' and current 'I' is given by

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Q = I/t

Q = It

Q = I²t

Q = I²/t

If the distance between two charges is doubled,the force between them will become:

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Double

Half

One third

One fourth

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

Surface tension of water is due to

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Inter molecular attractions

Inter molecular spaces

Inter molecular repulsion

None of above

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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Focus

Optical center

Edges

None of these

If work is done at the rate of 2 k j per second, then total work done is half an hour will be:

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0.5 Kwn

2 Kwh

1 Kwh

None of these

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

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60°

90°

120°

180°

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

In case of diffraction grating, unit of grating element is:

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Centimeter

Kilometer

As that of g

as that of angle

Which of the following statements about angular momentums is correct?

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Angular momentum remains conserved

Angular momentum is the product of moment of inertia and angular velocity

Moment of inertia is directly proportional to angular momentum for constant angular speed

All of these

A usual way to obtain a plane wave is to place point source of light at the focus of a

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concave lens

convex lens

both of them

either of them

A Carnot engine works between 600K and 300. If heat input is 100J then the output is

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300 J

400 J

50 J

56 J

The thermometer which is suitable to measure 2000°C is

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Platinum thermometer

Gas thermometer

Vapour pressure thermometer

Pyrometer

Which of the following have the same unit:

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Stress

Strain

Modulus elasticty

Both (A) and (C)

Both (A) and (B)

How many major components of fibre optic communication system are

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4

5

3

2

When a force is applied on a body, several effects are possible. Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

KWm^-2is the unit of

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Power

Energy

Intensity

Energy per unit area

Which of the following curve in P - V diagram represent adiabatic process

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The unit of intensity of electric field is

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newton/coluomb

Joule/culomb

Volt x metre

Newton/meter

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