Question # 1

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

A soft iron cylinder is placed inside coil galvanometer to:

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Make field circular and strong

Make field radial and weak

Make field radial and strong

All of above

Radioactivity happen due to the disintegration of

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Nucleus

Mass

Electrons

Protons

Curie temperature is a point where :

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Diamagnetism changes to paramagnetism

Paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

Paramagnetism changes to Ferromagnetism

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

Concept of electric field lines was given by:

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Michelson

Henry

Michael faraday

Oersted

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

When an electron in an atom goes from a lower to higher orbit its:

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K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

A transistor has parts:

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2

3

4

5

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

For which material medium, force between two charged particles is maximum.

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Ammonia

Germanium

Mica

Teflon

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

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