Question # 1

The line which passes through pole of the mirror and center of curvature is called principal:

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axis

Focus

Line

None of these

The unit of electric power is:

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Volt

Watt

Joule

Coulomb

The electrostatic force acting on two charges each of 1C separated by 1m is about:

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9X10⁹ N

9X10^-9 N

9X10⁸ N

9X10^-8 N

Ripple tank is an instrument which is used to study the characteristics of:

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Mechanical waves

Light waves

Radio waves

Electro-magnet waves

In a vacuum all electromagnetic waves have the same:

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Speed

frequency

amplitude

wavelength

In D.C.motor split rings are made of:

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Steel

Carbon

Copper

Iron

The phenomena used in capacitor is:

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electrostatic induction

induced current

electric field

electroscope

The disturbance travelling in a medium is called:

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Wave motion

Simple harmonic motion

Motion

both a ,b

According to Fleming's left hand rule the direction of magnetic field is indicated by:

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Thumb

Forefinger

Middle finger

Right hand rule

Magnetic effect of electric current was first discovered by:

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Faraday

Ampere

Volta

Lenz

The S.I unit of electric potential is:

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Watt

Joule

Coulomb

Volt

What does the term e-mail stand for:

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Emergency mail

Electronic mail

Extra mail

External mail

Mathematical form of Ohm's law is:

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V = IR

V = I2R

V = Qt

V = IR2

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