Question # 1

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

Ampere second stands for the unit of.

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Charge

emf

energy

Power

A device used for detection of current is called.

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Inductor

Voltmeter

Capacitor

Galvanometer

Which material should be inserted between the plates of a capacitor in order to increase its capacitance.

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Copper

Mica

Iron

Tin

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

Metals are good conductors of electricity because they have

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Large number of bounded electrons

Small number of electrons

Large number of free electrons

Small number of free electrons

In order to measure potential difference voltmeter is always connected in.

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Series

Parallel

Both a and b

Neither in series nor in parallel

The unit of impedance is

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Farad

Henry

Tesla

Ohm

Closeness of the electric field lines is the measure of.

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Direction of field

Strength of field

Potential difference

Uniformity of field

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

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 peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

Presence of dielectric between two charges always.

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Reduces the electric force

Enhance the electric force

Does not effect electric force

Double the electric force

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