Question # 1

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

Which of the following has least hysteresis loop area.

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Steel

Wrought Iron

Soft Iron

Cobalt

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Which one of the following is ductile substance.

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Copper

Lead

Wrought iron

All of them

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

An ideal current source shall have resistance

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Zero

Finite but not zero

Infinite

Depend upon requirement

An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.

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6

5

4

3

unit of Plank's constant is same as that of.

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Acceleration

Angular momentum

Linear momentum

Entropy

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

The number of Neutron is²³⁸U₉₂is

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92

238

146

330

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

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