Question # 1

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

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Charge

Momentum

Energy

Angular momentum

The sensitivity of galvanometer is given by

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CAN/B

C/BAN

BAN/C

BN/CA

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

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

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

Concept of electric field lines was given by:

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Michelson

Henry

Michael faraday

Oersted

Electrons are

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Hadrons

Laptons

Quarks

Baryons

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

The number of electrons in one coulomb charge is equal to

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6.2 x 10¹⁸ electrons

Zero electrons

1.6 x 10^-22 electrons

6.2 x 10²¹ electrons

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

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Capacitor

Commutator

Resistor

Inductor

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

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