Question # 1

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

Radius of first orbit of an atom is r1= 0.053 nm, Radius of second orbit r2 will be.

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0.106 nm

0.212 nm

0.053 nm

0.53 x 10^-10 nm

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

Life time of metastable states is

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10^-6 sec or more

10^-3 sec or more

10^-5 sec or more

None of these

Which is not fundamental logic gate.

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NOT

AND

OR

NAND

Which of the following has least hysteresis loop area.

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Steel

Wrought Iron

Soft Iron

Cobalt

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

The unit of Plank's constant 'h' is.

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JC

J/C

JS

J/S

Which one is not a crystalline solid.

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Zinc

Copper

Nylon

None of these

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

Electric power:

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Vx1

V²x1

V/1

V/1²

Commutator was invented in

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1834

1820

1840

1835

When the medium is insulator the elecrostatic force between the charges is

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Decreased

Zero

Increased

None of above

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

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