Question # 1

An emf is set up in a conductor when it

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

The work is stored in the inductor as

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Electric potential energy

Elastic potential energy

Magnetic energy

Absolute potential energy

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

Total number of turns on 0.15 m length solenoid is 300. the value of n is:

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Greater than 300

Smaller than 300

Equal to 300

Any of (A) or (B)

Any of (A) or(C)

When a body moves to and fro motion, this type of motion is called

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translatory motion

circular motion

oscillatory motion

all of them

Weber is a unit of

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magnetic flux

magnetic filed intensity

magnetic induction

magnetic flux density

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

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n/AL

Al/n

nAL

nA/L

In a three phase a.c generator if the first coil has a phase 0, then the other two coils will have phases

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90° - 120°

20° and 140°

120° and 240°

120° and 140°

A shunt resistance parallel to the galvanometer is used to convert it into

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avometer

millimeter

voltmeter

none of these

After curie temperature iron is

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Ferromgnetic

Diamagnetic

Paramagnetic

None

The diodes works on

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A.C

D.C

both A and B

None of these

A long them flat sheet has a uniform surface charge density σ. The magnitude of the electric field at a distance 'r' from it is given by

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σ/∈_o

σ/2∈_o

σ/∈_or

σ/2∈_or

Which of the following is not an advantages of using optical fibres over copper cables?

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signal attenuation

number of signals carried per wire

cost of installation

none of the above

Magnetic field inside a solenoid is:

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) Directly proportional to current

Inversely proportional to current

Directly proportional to its length

Inversely proportional to total no of turns

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:

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25 Hz

70.7 Hz

50 Hz

100 Hz

When a stress changes its length, it is called

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Stress

Tensile stress

Shear stress

None of these

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either A or B

Either B or C

If v is the velocity of flow of liquid through a tube of area of cross-section A then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

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