Question # 1

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

In LR circiut which one of the following statements is correct?

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L and R opposes each other

R value increases with frequency

The inductive reactance increases with frequency

The inductive reactance decreases with frequency

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

Mass of meason is

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Greater then proton

Less than proton

Equal to proton

Equal to neutron

Two oppositely charged balls A and B attract the third ball C, when placed near them turn by turn The third ball C must be.

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Positively charged

Negatively charged

Electrically neutral

Positively and negatively charged

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

If current flowing through a solenoid becomes four times, then magnetic field inside becomes.

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two times

three times

four times

Half

The radioactive decay obeys the law

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The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

A solid in which there is not regular arrangement of molecules is called.

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Glassy solid

Amorphous solid

Crystalline solid

Both a and b

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

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