Question # 1

Radioactivity happen due to the disintegration of

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Nucleus

Mass

Electrons

Protons

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

Torque on a current carrying coil

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τ=IBA cos

τ = ILB sinα

τ = IBA sinα

τ = ILBcosα

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

A device used for detection of current is called.

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Inductor

Voltmeter

Capacitor

Galvanometer

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞

Which one is not a ductile material

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Lead

Steel

Copper

Wrought Iron

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

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

Mass equivalent of 931 MeV energy is:

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6.02 x 10^-23 kg

1.766 x 10^-27kg

2.67 x 10^-29kg

6.02 x 10^-87kg

Curie temperature is a point where :

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Diamagnetism changes to paramagnetism

Paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

Paramagnetism changes to Ferromagnetism

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