Question # 1

The sum of electric and magnetic force is called.

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Maxwell force

Lorentz force

Newton's force

Centripetal force

Einstein photoelectric equation is

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None of these

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

For an atom of hydrogen atom the radius of the first orbit is given by:

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H/me²

me/4h²

h2/4π² kme²

h² me²

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

Mass of meason is

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Greater then proton

Less than proton

Equal to proton

Equal to neutron

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

Useful device to measure resistance, current and voltage is an electronic instrument called.

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

A current carrying conductor experience maximum magnetic force in a uniform magnetic field when it is placed.

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Perpendicular to field

Parallel to field

At an angle of 60 ^o to the field

None of these

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

A capacitor stores energy in the form of.

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Magnetic field

Heat energy

Electrical energy

Mechanical energy

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

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