Question # 1

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

The sensitivity of galvanometer directly depends upon

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Magnetic field

Area of coil

Both a and b

None of a, b, c

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

The unit of magnetic induction B is

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Coulomb

Ampere

Coulomb/ampere

Weber/m²

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

A positive charge is moving towards an observer, The direction of magnetic induction will be.

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Toward right

Anti clockwise

Clockwise

Toward left

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

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