Question # 1

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

Which type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

Cathode ray oscilloscope works by deflecting a beams

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Neutrons

Protons

Electrons

Positron

One weber is equal to:

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N.A ²/m

N.m²/A

N.A/m

N.m/A

The number of Isotopes of cesium are.

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4

32

22

36

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

Young's modulus for water's is

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Zero

1

2

3

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

Both Xenon and cesium have

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33 isotopes

34 Isotopes

36 Isotopes

35 Isotopes

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

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

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

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