Question # 1

The temperature at which, semiconductor behaves as insulators:

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10k

0k

237k

None of above

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

The anodes in cathode ray oscilloscope.

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Control number of waves

Control brightness of sept formed

Accelerate as well as focus beam

Negative potential w.r.t to chithode

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 vector sum of electric force and magnetic force is called:

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Deflecting force

Lorentz force

Newton force

Faraday's force

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

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

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

The mass of beta particle is equal to the mass

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Proton

Neutron

Electron

Photon

Commutator was invented in

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1834

1820

1840

1835

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