Question # 1

In gas the charge carriers are:

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Electrons

Ions

Both a & b

None of above

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

De-Broglie waves are associated with

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Moving charged particles only

Moving neutral particles only

All moving particles

All parties whether in motion or at rest

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

None of these

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

Improper bisting of a transistor circiut produces:

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Heavy loading of emitter current

Distortion in the output output signal

Excessive heat at collector terminal

Faculty location of load line

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

The SI unit of resistivity is.

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Ohm m-2

Ohm m-1

Ohm m

Ohm

The reciprocal of decay construct lamda of a radioactive element is.

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Half life

Mean life

Curie

total life

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

A wire uniform cross-section. A length L and resistance R is cut into two equal parts. The resistivity of each part will be:

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Doubled

Halved

Remain the same

One fourth

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

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