Question # 1

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

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

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

mho -m-1 is the unit of.

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Resistance

Resistivity

Conductance

Conductivity

If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be.

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600 Ohm

550 Ohm

450 Ohm

400 Ohm

Curie temperature is

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Differen for chromium oxide and cobalt

Same for chromium oxide and cobalt

Same for iron and cobalt

None of these

During negative half cycle of A.c then p-n junction offers.

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High resistance

Low resistance

No resistance

All of these

Terminal potential difference is greater than emf of the cell when

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Circuit is open

Circuit is closed

small battery is charged by bigger battery

None of these

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

The unit of magnetic induction B is

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Coulomb

Ampere

Coulomb/ampere

Weber/m²

For normal use:

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Emitter base function is reversed biased

Collector base junction is reserved biased

Emitter base junction is forward biased

Both c and b

When an electron in an atom goes from a lower to higher orbit its:

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K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

One weber is equal to:

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N.A ²/m

N.m²/A

N.A/m

N.m/A

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

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal

A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:

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6 months

8 months

12 months

16 months

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