Question # 1

The first superconductor was discovered in:

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1831

1911

1921

1876

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

Minimum number of semi conductor diodes required for full wave rectification are.

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1

2

3

4

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

The electrons in one coulomb change is equal to.

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1.6 x 10^-19

2.25 x 10^-19

6.25 x 10^-18

6.25 x 10^-19

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

Electric power:

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Vx1

V²x1

V/1

V/1²

If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be.

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600 Ohm

550 Ohm

450 Ohm

400 Ohm

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

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