Question # 1

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

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S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

Mass of meason is

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Greater then proton

Less than proton

Equal to proton

Equal to neutron

Specific resistance of a material depends upon.

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Length

Area

Temperature

Both A and B

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None of the above

Laser is a device which can produce:

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Intense beam of light

Coherant beam of light

Monochromatic beam of light

All of the above

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

The Unit of decay constant.

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Second

(second)-1

m-1

mk

When the K.E. of photoelectric is zero, the frequency of incident photon is.

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Less than

greater than

Equal to

Much greater

The negative of the potential gradient is

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Electrostatic force

Electromotive force

Potential difference

Electric field intensity

Weber is the unit of

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Magnetic flux

Permeability

magnetic force

None of above

The effective way to increase the sensitivity of moving coil galvanometer is.

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Increase the area of coil

Increase the number of turn

Increase the magnetic field

Increase the value of constant C

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

In A.C circuit through a capacitor which one is:

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Current leads voltage by 90^∘

Current lags behind voltage by 90^∘

Both will be in phase

None of above

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

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