Question # 1

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

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Wien's constant

Planck's constant

Davison constant

Lumber's constant

A battery move a charge of 40 C around a circuit at constant rate in 20 Sec. The current will be.

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2 A

0.5 A

80 A

800 A

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

A solid in which there is not regular arrangement of molecules is called.

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Glassy solid

Amorphous solid

Crystalline solid

Both a and b

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

The unit of strain is:

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Nm

Nm^-2

no unit

Nm²

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

The fraction change in resistance per Kelvin is known as:

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Temperature coefficient of Resistance

Coefficient of voltage of change

Thermal expansion

All of the above

The value of capacitive reactance is given by

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Xc = VI

All of above

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

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