Question # 1

For automatic Switching of streetlight, the op amplifier is used as.

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Inductor

Converter

Comparator

Thermistor

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

Which one is not a ductile material

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Lead

Steel

Copper

Wrought Iron

Out of the following which material is brittle.

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Wrought iron

Copper

Tungsten

High steel carbon

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

the number of terminals in a semiconductor diode are

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2

3

4

5

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

The energy of 4th Orbit in hydrogen atom is.

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-2.51 eV

-3.50 eV

-13.60 eV

-0.85 eV

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

Current passing through the coil of galvanometer

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CO/BAN

CoN /BA

NAB/CO

AN/BCO

The temperature of core of nuclear reactor is:

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1100°C

1200°C

1300°C

1400°C

The number of lines per unit area passing perpendicular through an area is called

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Flux

Electric intensity

Both (a) , (b)

None of these

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

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