Question # 1

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

Two oppositely charged balls A and B attract the third ball C, when placed near them turn by turn The third ball C must be.

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Positively charged

Negatively charged

Electrically neutral

Positively and negatively charged

Both Xenon and cesium have

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33 isotopes

34 Isotopes

36 Isotopes

35 Isotopes

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

An alternating quantity (voltage or current) is completely known if we know its:

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Maximum

Frequency and phase

Effective value

Both (a) & (b)

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

Cathode ray oscilloscope works by deflecting a beams

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Neutrons

Protons

Electrons

Positron

Curie temperature is

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Differen for chromium oxide and cobalt

Same for chromium oxide and cobalt

Same for iron and cobalt

None of these

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