Question # 1

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

The radio active nuclide ₈₆Ra²²⁸ decays by a series of emissions of three alpha particles and one beta particle. The nuclide X finally formed is:

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₆₄X²²⁰

₈₆X²²²

₈₄X²¹⁶

₈₈X²¹⁵

The magnitude of motional emf is given by

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Soft magnetic material is

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Sodium

Steel

Iron

Copper

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

Minimum number of semi conductor diodes required for full wave rectification are.

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1

2

3

4

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

Some charge is being given to a conductor. Then its potencial

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Its maximum at surface

Its maximum at Its maximum at center

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

Concept of electric field lines was given by:

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Michelson

Henry

Michael faraday

Oersted

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