Question # 1

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

Shunt resistance is

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Low resistance

Zero resistance

High resistance

Impedance

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

The unit of Magnetic flux is called.

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weber

weber/m²

NM^-1A^-1

None of above

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

The product of resistance and capacitanc eis.

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Velocity

Force

Acceleration

Time

If there is no fourth band, tolerance is shows as

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10%

Magnetic flux density at a point due to current carrying coil is determined by

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Ampere's law

Faraday's law

Lenz's law

Gauss's law

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

The mass of beta particle is equal to mass of.

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Protons

Electrons

Neutrons

Boron

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