Question # 1

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

The natural frequency of L.C circuit is equal to

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The sum of electric and magnetic force is called.

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Maxwell force

Lorentz force

Newton's force

Centripetal force

The resistivity of --------------------decrease with the increase in temp

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Gold

Silver

Copper

Silicon

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

The magnetic flux will be max, For an angle of:

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0°

60°

90°

180°

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

One ohm is equal to

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VC-1

CV-1

AC-1

VA^-1

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

For rectification we use.

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Transformer

Diode

Choke

Generator

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

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