Question # 1

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

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

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Anode

Cathode

Grid

Deflecting plates

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

The sum of electric and magnetic force is called.

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Maxwell force

Lorentz force

Newton's force

Centripetal force

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

None of these

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.

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X rays

Gama rays

Heat Radiation

Ultraviolet rays

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

When a pot difference of 4 volt is applied across resistance, 10 J of energy is converted Find charge flows

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0.20 C

2.5 C

5.0 C

10.0 C

The place for soring the nuclear waste is

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Ocean

Damping in earth

Damping in desert

Bottom of old salt mines

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