Question # 1

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

Electric power:

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Vx1

V²x1

V/1

V/1²

A device that shows the visible path of ionizing particle is called.

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GM counter

Solid state detector

Scalar

Wilson cloud chamber

When Ohm meter gives full scale deflection it indicates.

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Zero resistance

Infinite resistance

Small resistance

Very High resistance

In according with Bohr's theory the K.E of the electron is equal to:

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ke²/2r

Ze²/r

Ze²/r²

Ze²/2r²

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

The symbol of p-n-p transistor is

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There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

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