Question # 1

When we heat the metal at high temperature they emit:

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Holes

Protons

Neutrons

Electrons

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

The focal length is related to radius of curvature by the formula:

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f = 2R

f = 4R

f = R/2

R = f/2

by connecting suitable high resistance in series with galvanometer it will convert into:

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voltmeter

galvanometer

ammeter

multimeter

Mathematical formula of sound level (in bel) is:

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S.L = 10 log I/Io (bel)

S.L = K log I/Io (bel)

S.L = Log I/Io (bel)

S.L = 10 log Io/I (bel)

SI unit of electric intensity is:

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Watt

NC^-1

NS^-1

Nm

The advantages of electronic mail are:

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Fast communication

Cost free service

More efficient

All of these

The waves which travel in straight line through space and have strong signals are called:

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Micro waves

Mechanical waves

Light waves

Magnet waves

Transformer Works on the principle of:

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Self induction

Mutual induction

Electro statatic

Induction

If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire.

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Increases

Decreases

Remains the same

Will be zero

It mean position kinetic energy of the ball is:

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Minimum

Zero

Maximum

None of these

Magnetic effect of electric current was first discovered by:

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Faraday

Ampere

Volta

Lenz

electroscope can also be charges by the process of:

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electrostatics

electricity

convection

conduction

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