Question # 1

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

For rectification we use.

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Transformer

Diode

Choke

Generator

If there is no fourth band, tolerance is shows as

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10%

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

In an N-type silicon, which of the following statement is true?

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Electrons are majority carriers & trivalent atoms are the dopants

Electrons are majority carriers & pentavalent atoms are the dopants

Holes are minority carriers & pentavalent atoms are the dopants.

Holes are minority carriers & trivavalent atoms are the dopants.

A charge on 4 coulomb is in the field of intensity 4N/C the force on the charge is.

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Uniform

Non uniform

Weak

Strong

_______ is the building block of every electronic circuit.

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Semi conductor diode

Resistor

Capacitor

Amplifier

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

X₁is low for low frequency Fy but Xc is.

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Zero

Low

High

Same is H

One electron volt is equal to.

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1.6 x 10^-19 Joule

1.6 x 10^-19Coulomb

1.6 x 10^-12N

1.6 x 10¹⁸Joule

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

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