Question # 1

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

Grid in cathode ray oscilloscope controls.

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Number of electron

Temperature of filament

Frequency of electron

Energy of electrons

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

The free electrons experience force.

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In direction of -E

In direction of E

Both A and B

All of the above

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking?

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25 m

1mm

2mm

0.5 m

The Unit of decay constant.

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Second

(second)-1

m-1

mk

When a charge is projected perpendicular to a uniform magnetic field, tis path is

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Spiral

Helix

Ellipse

Circular

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

The number of crystal system are

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Three

Five

Seven

Fifteen

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

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