Question # 1

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

The number of electrons in one coulomb charge is equal to

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6.2 x 10¹⁸ electrons

Zero electrons

1.6 x 10^-22 electrons

6.2 x 10²¹ electrons

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

The reactance of inductor depends upon

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L

All of the above

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

Which one of the following resistance is used to convert a Galvanometer into an ammeter.

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High resistance

Low resistance in series with galvanometer

Shunt

High resistance in series with galvanometer

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

Conversation of only one half of A.C. into D.C. is called.

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Half wave amplification

Wave amplification

Half wave electrification

Half wave rectification

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

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