Question # 1

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

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

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

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

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

When a charge is projected perpendicular to a uniform magnetic field, tis path is

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Spiral

Helix

Ellipse

Circular

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

Resistance of choke is

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zero

Large

Very small

Infinite

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

What is the resistance of carbon resistor which has band brown black brown.

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100 Ohm

1000 Ohm

10 Ohm

1.0 Ohm

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

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