Question # 1

in a dry cell, chemical energy changes into:

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mechanical energy

electrical energy

potential energy

kinetic energy

Which radiations are free of effect of electric and magnetic field?

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Alpha

Beta

Gamma

Alpha and beta

The direction of induced e.m.f. in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

The particles emitted from a hot cathode surface are:

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Positive ions

Negative ions

Protons

Electrons

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

Which form of energy is sound:

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Electrical

mechanical

Thermal

Chemical

Number of poles in a magnet is:

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One

Two

Three

Unlimited

Transformer Works on the principle of:

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Self induction

Mutual induction

Electro statatic

Induction

Which technology is used in mobile phone:

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Heat

Radio

Light

Laser

The speed of sound in a liquid is …………..than that in gases:

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Ten times

Fifteen times

Five times

Two times

When did Michael Faraday discover Electromagnetic induction?

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1841

1831

1821

1811

Which combination forms NAND gate:

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AND & OR

AND & NOT

NOT & OR

NAND & NOT

The relation between v,f andλ of a wave is:

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vf=λ

fλ = v

vλ =f

v=λ/f

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