Question # 1

The resistivity of --------------------decrease with the increase in temp

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Gold

Silver

Copper

Silicon

Electric field intensity at a point is defined by the relation.

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E= q/F

E = F/q

E = qF

E = F/q2

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

A transistor has:

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Two regions

Three regions

Single regions

Four regions

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

A sensitive galvanometer is

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Unstable

Stable

Moderate

Both B and C

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

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

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

The Unit of decay constant.

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Second

(second)-1

m-1

mk

The negative of the potential gradient is

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Electrostatic force

Electromotive force

Potential difference

Electric field intensity

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

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