Question # 1

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10^-2 Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at

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900^oC

600^oC

800^oC

100^oC

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

NIBA =

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cθ

θ/c

c²θ

c²/θ

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

the current which flows from a point at higher. potential to point at lower potential is called.

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Electric current

Conventional current

Either of these

None of above

Electrons are

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Hadrons

Laptons

Quarks

Baryons

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

Charge on positron is:

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Negative

Positive

Netural

None of these

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

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