Question # 1

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

When a pot difference of 4 volt is applied across resistance, 10 J of energy is converted Find charge flows

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0.20 C

2.5 C

5.0 C

10.0 C

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

A solid in which there is not regular arrangement of molecules is called.

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Glassy solid

Amorphous solid

Crystalline solid

Both a and b

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

A capacitor is perfect in insulator for.

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Alternating current

Sparking current

Eddy current

Direct current

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

In extrinsic semiconductors doping is of the order of.

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1 atom to 10⁴

1 atom to 10⁶

1 atom to 10⁸

1 atom to 10³

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

___ is correct relation.

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IT = 10^-4G

IT = 10⁴ G

IT = 10² G

IT = 10^-2 G

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

Potentiometer is used to.

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Compare emf of two cells

Detect internal resistance of cell

Measure P.D.

All of these

Which is not fundamental logic gate.

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NOT

AND

OR

NAND

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

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