Question # 1

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

Electric power:

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Vx1

V²x1

V/1

V/1²

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

X -rays are similar in nature to.

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Gama rays

Beta rays

Alpha rays

Cathode rays

A transistor has:

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Two regions

Three regions

Single regions

Four regions

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

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

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

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