Question # 1

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

Weber is the unit of

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Magnetic flux

Permeability

magnetic force

None of above

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

Capacitance of a capacitor does not depend upon.

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Distance between plates

Area of plates

Electric field between plates

Medium between plates

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

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

In order to measure potential difference voltmeter is always connected in.

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Series

Parallel

Both a and b

Neither in series nor in parallel

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

Farad is defined as

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"Coulomb/Volt

Ampere /Volt

Coulomb /Joule

Volt/Coulomb

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