Question # 1

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

The types of quacks are.

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2

3

4

6

X -rays are similar in nature to.

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Gama rays

Beta rays

Alpha rays

Cathode rays

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

The first superconductor was discovered in:

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1831

1911

1921

1876

If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

The name of the scientist who noted that a compass needle was deflected when placed near the current carrying conductor

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Henry

Faraday

Coloumb

Oersted

Magnetism is related to:

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Stationary charges

Moving charges

Stationary & Movingcharges

Law of motion

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

The conductors having the conductivity of the order of

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In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

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