Question # 1

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

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The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

Commutator was invented in

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1834

1820

1840

1835

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

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 unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

the number of terminals in a semiconductor diode are

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2

3

4

5

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