Question # 1

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

In full wave rectification number of diodes required are equal to.

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2

3

4

5

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

The typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

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Wien's constant

Planck's constant

Davison constant

Lumber's constant

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

Closeness of the electric field lines is the measure of.

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Direction of field

Strength of field

Potential difference

Uniformity of field

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

The leV =

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1.6x10-19C

1.6x10-11J

1.6x10-19J

1.6x10-11C

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

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

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Decreases

Increases

Becomes zero

Becomes infinity

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

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