Question # 1

The sensitivity of galvanometer directly depends upon

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Magnetic field

Area of coil

Both a and b

None of a, b, c

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

The Kirchhoff 1^st rule is manifestation of:

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Law of conservation of mass

Law of Conservation of charge

Law of conservation of energy

None of above

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

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

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

Potentiometer is used to.

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Compare emf of two cells

Detect internal resistance of cell

Measure P.D.

All of these

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

Which one of the following paved the way for modern physics

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Newtonian mechanics

Theory of relativity

Quantum theory

All of above

An ECG records the _____ between points on human skin generated by electric process i the heart.

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Heart beat

Pulse rate

Pressure

Voltage

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