Question # 1

A substance having the negative temperature co efficient of resistivity out of the following is.

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Carbon

Iron

Tungsten

Gold

___ is correct relation.

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IT = 10^-4G

IT = 10⁴ G

IT = 10² G

IT = 10^-2 G

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

Current passing through the coil of galvanometer

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CO/BAN

CoN /BA

NAB/CO

AN/BCO

Farad is defined as

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"Coulomb/Volt

Ampere /Volt

Coulomb /Joule

Volt/Coulomb

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

The unit of strain is:

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Nm

Nm^-2

no unit

Nm²

A transistor has parts:

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2

3

4

5

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

e/m=

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v/Br

Br/V

VB/r

Vr/B

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

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

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

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