Question # 1

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

Two up quarks and one down quarks makes a

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Proton

Newton

Photon

Meson

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

Those materials whose resistivity becomes zero at certain temperature is called:

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Semiconductor

Super conductor

Conductor

Insulator

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

Circulation of blood is studied by radio isotope.

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Cobalt -60

Phosphorus -32

Sodium -24

Iodine -131

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

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 unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

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