Question # 1

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

The number of neutrons in Li are

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2

3

4

7

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

substance which undergo plastic deformation until they break are known as.

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Brittle substances

Ductile substance

Non magnetic substance

Magnetic substance

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

Presence of dielectric between two charges always.

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Reduces the electric force

Enhance the electric force

Does not effect electric force

Double the electric force

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

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