Question # 1

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

The fact that electric field exist in space around an electrical charge is

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Electrical property

Gravitational property

Intrinsic property of nature

Extrinsic property of nature

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

The magnetic flux will be max, For an angle of:

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0°

60°

90°

180°

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

The moderator used in a nuclear reactor

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Sodium

Uranium

Graphite

Cadmium

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

In order to measure potential difference voltmeter is always connected in.

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Series

Parallel

Both a and b

Neither in series nor in parallel

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is:

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3Ω

4Ω

4.5Ω

5Ω

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

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