Question # 1

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

The mass of beta particle is equal to the mass

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Proton

Neutron

Electron

Photon

In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

Unit of self inductance is

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Weber

Tesla

Henry

Farad

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

Circulation of blood is studied by radio isotope.

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Cobalt -60

Phosphorus -32

Sodium -24

Iodine -131

Curie temperature is

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Differen for chromium oxide and cobalt

Same for chromium oxide and cobalt

Same for iron and cobalt

None of these

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

Rutherford performed on experiment on a nuclear reaction in:

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1921

1981

1927

1932

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

The acceleration of an electron of mass m and charge e, moving with uniform speed v at right angles to a magnetic field of flux density B, is given by

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Bevm

Magnetic flux density is measured in

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Weber

Weber/m2

Tesla -m

Gauss

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

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