Question # 1

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

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

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

Choke consumes extremely small

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Current

Charge

Power

Potential

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

In full wave rectification number of diodes required are equal to.

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2

3

4

5

Resistance of choke is

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zero

Large

Very small

Infinite

The charge on Beta particle is

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+e

-e

-2e

None of these

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

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

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

The mass spectrum of naturally occurring neon shows the most abundant isotope has atomic mass.

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19

20

21

22

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