Question # 1

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

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

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

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

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

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

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Carbon burshes

Coil

Commutator

Magnetic field

When an electron in an atom goes from a lower to higher orbit its:

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K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

The galvanometer can be made sensitive by making the factor BAN/C

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Large

Small

Constant

Zero

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Out of the following which material is brittle.

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Wrought iron

Copper

Tungsten

High steel carbon

The color code of "Green"

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8

3

5

7

In A.C circuit through a capacitor which one is:

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Current leads voltage by 90^∘

Current lags behind voltage by 90^∘

Both will be in phase

None of above

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