Question # 1

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

At high frequency the value of reactance of capacitor will be.

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Small

Zero

Large

Infinite

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

When charge particle enter perpendicular to magnetic field, the path followed by it is:

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A helix

A circle

Straight line

Ellipes

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

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

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Half

Two

Four times

One fourth

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

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

The first superconductor was discovered in:

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1831

1911

1921

1876

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

e/m=

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v/Br

Br/V

VB/r

Vr/B

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

Which type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

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