Question # 1

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

the force between two charge is 28 N. If paraffin wax of relative permittivity 2.8 is introduced between the charges as medium, then the force reduces to.

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25 N

20 N

10 N

15 N

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

A rheostat can be used as variable resistor as well as a-------------

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Potential divider

Current divider

Wheat stone bridge

Power divider

The SI unit of resistivity is.

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Ohm m-2

Ohm m-1

Ohm m

Ohm

A wire uniform cross-section. A length L and resistance R is cut into two equal parts. The resistivity of each part will be:

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Doubled

Halved

Remain the same

One fourth

X- ray diffraction reveals that these are

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Particle type

Wave type

Both wave and particle

None of above

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

The galvanometer can be made sensitive by making the factor BAN/C

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Large

Small

Constant

Zero

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

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Wien's constant

Planck's constant

Davison constant

Lumber's constant

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

The quantity of U in the naturally occurring uranium is.

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0.2%

0.3%

0.7%

0.4%

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

De-Broglie waves are associated with

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Moving charged particles only

Moving neutral particles only

All moving particles

All parties whether in motion or at rest

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

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