Question # 1

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

An electric field cannot deflect

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X-rays

a-particles

ß-particles

None of these

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

In carbon resistors, then value of Blue colour is.

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6

7

8

9

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

Ampere second stands for the unit of.

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Charge

emf

energy

Power

Useful device to measure resistance, current and voltage is an electronic instrument called.

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

Which component of the transistor has greater contrition of impurity.

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Base

Emitter

Collector

Emitter and collector

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

A rheostat can operate as.

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Amplifier

Potential divider

Oscillator

Transformer

The number of lines per unit area passing perpendicular through an area is called

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Flux

Electric intensity

Both (a) , (b)

None of these

When a charge is projected perpendicular to a uniform magnetic field, tis path is

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Spiral

Helix

Ellipse

Circular

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