Question # 1

Light emitting diodes are made from semiconductors.

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Silicon

Germanium

Carbon

Gallium arsenide

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

In the equation if f₂ > then

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Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

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

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

NAND gate represented by:

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X = A. B

X = A+B

X= A.B

X=|A+B|

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

Some charge is being given to a conductor. Then its potencial

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Its maximum at surface

Its maximum at Its maximum at center

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

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 A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

The motional emf is give by

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qvB

IBL

eBL

vBL

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

Choke consumes extremely small

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Current

Charge

Power

Potential

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