Question # 1

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

The reverse saturation current in a PN junction diode is only due to:

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

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

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Carbon burshes

Coil

Commutator

Magnetic field

A charged particle having charge 'q' is moving at right angle to magnetic field. The quantity which varies is.

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Speed

Kinetic energy

Path of motion

angular velocity

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

A material which is insulator at 0 K and conduct at room temperature is.

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Silver

Lead

Germanium

Polythene

1 gray is equal to.

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1 JKg-1

1KgJ-1

1JKg

1 JKg-2

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

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