Question # 1

A charge kept at the centre of a shell The shell has charge Q and radius R The force on the central charge due to shell is

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in the upward direction

Towards left

Towards right

Zero

Since selenium becomes conductor in light so it is.

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Photoconductor

Photocell

Thermistor

Photodiode

Super conductor are used in

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Fast computer chips

Magnetic resonance imaging

Magnetic levitation trains

All of the above

In which of the following eddy current is not used

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Induction furnace

Automobile speedometer

Electromagnetic damping

X- rays diffraction

What is measured by the energy dissipated when a source drives a unit charge round a complete circuit.

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Electromotive force

Potential difference

Power

Resistance

Magnetic lines of force due to earth's horizontal magnetic field are.

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Curved lines

Elliptical

concentric circles

Parallel and straight

If air is replaced by any other dielectric medium, the force between two charges.

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Decreases

Increases

Remain the same

Becomes infinity

What does the electricity meter record.

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Charge

Current

Energy

Power

What information is given by the tangent to a field that point of electric field.

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Magnitude

Direction

Proper unit

Dimensions

Lagging of magnetic flux density behind the magnetizing fled is known as.

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susceptibity

Diamagnetism

Hysteresis

Retentivity

The permeability of a diamagnetic material is

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Greater than unity

Less than unity

Equal to unity

Zero

Condenser is used

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To produce charge

To change the direction of current

To collect the charge

As a good conductor of electricity

Gauss's law a most useful in cases where the charge distributions.

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Are made up of discrete point charges

Are finite in their spatial extent

Give rise to inverse square law fields

Posses a certain amount of symmetry

On which principle the induction coil works on.

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Self induction

Ampere's rule

Mutual induction

Gauss's law

The unit of electrochemical potential is.

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J mol-1

volt

J C-1

Mol J-1

A transformer is used to.

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Convert D.C. into A.C.

Convert A.C. in to D.C.

Obtain A.C. voltage

Enhance the power

The electric heater takes a current of 4 A from a 250 V supply . How long would it take the heater to convert 400,000 J of electric energy.

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100 s

200 s

400 s

750 s

The typical value of forbidden energy gap in germinium is.

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0.7 eV

1.0 eV

1.4 eV

10 eV

Which one of the following represents an ohm.

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Volt per ampere

Joule per second

Watt per ampere

Joule per coulomb

Which electrical quantity has the same units as electromotive force.

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Charge

Current

Potential difference

Power

At which temperature a ferromagnetic material becomes paramagnetic on healing.

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Kelvin temperature

Celsius temperature

Curie temperature

Fahrenheit temperature

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