Question # 1

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

Semiconductors have conductivity of order:

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10^-8 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10² to 10⁵ (Ωm)^-1

10^-5 to 10^-7 (Ωm)^-1

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

Flux through any closed surface is:

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1/ε²_∘ times the total charge enclosed in it

ε²_∘ time the total charge enclosed in it

1/ε_∘ ties the total charge enclosed in ti

ε_∘ time the total charge enclosed in it

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

Which of the following is one of the spectral series of atomic hydrogen?

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Brockett series

Balmer series

P fund series

All of above

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

The conventional current is due to the flow of

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Atoms and molecules

Positive charge

Negative charge

Bot (b) and (c)

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

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

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0°

60°

90°

180°

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero

One electron volt is equal to.

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1.6 x 10^-19 Joule

1.6 x 10^-19Coulomb

1.6 x 10^-12N

1.6 x 10¹⁸Joule

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

Unit (S.I) of temperature coefficient of resistivity of a material is

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K

K^-1

^oC

K^-2

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

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