Question # 1

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

For automatic Switching of streetlight, the op amplifier is used as.

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Inductor

Converter

Comparator

Thermistor

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

If the separation between the plates of a capacitor is doubled then its capacitance become.

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Double

Half

One fourth

Three times

For normal transistor the emitter current can be given by

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I_E = I_C

I_E = I_C + I_B

I_E = I_B

None of these

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

The torque in the coil can be increased by increasing:

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No. of turns

Current and magnetic field

Area of coil

All of the above

The number of Neutron is²³⁸U₉₂is

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92

238

146

330

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

None of above

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

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