Question # 1

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

amu =

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1.06 x 10^-27 kg

1.6606 x 10^-27 kg

1.520 x 10^-21 kg

1.6606 x 10^-31 kg

Lenz's law presented in

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1834

1934

1826

1836

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

The electric intensity due to two oppositely charged plates is

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None of these

The temperature of core of nuclear reactor is:

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1100°C

1200°C

1300°C

1400°C

Thermosouple is an arrangement of two different metals:

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Two convert heat energy into electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electrical energy into heat energy

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

A device that shows the visible path of ionizing particle is called.

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GM counter

Solid state detector

Scalar

Wilson cloud chamber

Charge on electron is

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1.6 x 10^-19 C

1.6 x 10¹⁹C

1.6 x 10^-17C

1.6 x 10¹⁷C

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

In nuclear radiation , track of alpha particle is.

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Thin

Discontinuous

Erratic

Continuous

A sensitive galvanometer is

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Unstable

Stable

Moderate

Both B and C

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