Question # 1

A capacitor is perfect in insulator for.

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Alternating current

Sparking current

Eddy current

Direct current

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

Which one of the following is polymeric solids

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Glass

Nylon

Copper

Zinc

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

The SI unit of magnetic induction Tesla is equal to

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N-1 Am

NA m2

NA-1n2

NA-1m-1

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

Energy released by conversion of 1 amu is

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200 MeV

931 MeV

233 MeV

243 MeV

Colour codes are used to calculate the.

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Nature of resistor

Numerical value of resistance

Potential difference

Current

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

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Wien's constant

Planck's constant

Davison constant

Lumber's constant

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

Which consumes small power.

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Inductor

Resistor

Motor

All of these

Einstein was awarded Nobel prize in physics in

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1905

1911

1918

1921

The physical quantity related to photon, that does not change in Compton scattering is.

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Energy

Speed

Frequency

Wavelength

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