Question # 1

106 electrons are moving through a wire per second the current developed is:

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1.6 x 10-19 A

1 A

1.6 x 10-13A

106 A

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

A charged particle enters in a strong magnetic field its K.E.

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Remain constant

Increases

Decreases

Increases then decreases

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

During electrolysis process, density of CuSO₄ solution

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Remains constant

Decreased

Increased

None of these

In case of reverse biasing, current is flown due to:

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Minority charge carriers

Majority charge carriers

Electrons

Protons

The number of protons in any atom are always equal to the number of

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Neutrons

Electrons

Positrons

Mesoris

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

A photo diode can turn its current ON and OFF in

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Micro seconds

Mega seconds

Nano seconds

Mili seconds

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

A transistor has parts:

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2

3

4

5

If there is no fourth band, tolerance is shows as

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10%

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

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