Question # 1

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

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

Magnetic lines of force are.

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Imaginary

Real

Perpendicular

In phase with electric lines of force

A rheostat can operate as.

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Amplifier

Potential divider

Oscillator

Transformer

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

One electron volt is equal to.

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1.6 x 10^-19 Joule

1.6 x 10^-19Coulomb

1.6 x 10^-12N

1.6 x 10¹⁸Joule

Most of the electrons in the base of an NPN transistor flow:

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Out of the base lead

Into the collector

Into the emit

Into the base supply

In case of op-amp as an inverting amplifier, V₊ - V_- = 0, this is because

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Open gain loop is very low

Closed loop gain is very high

Open loop gain is very high

Both (a) and (a)

The resistivity of --------------------decrease with the increase in temp

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Gold

Silver

Copper

Silicon

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

Radius of first orbit of an atom is r1= 0.053 nm, Radius of second orbit r2 will be.

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0.106 nm

0.212 nm

0.053 nm

0.53 x 10^-10 nm

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

Soft magnetic material is

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Sodium

Steel

Iron

Copper

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

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