Question # 1

The electric field intensity at a point due to a point charge

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Falls off inversely as the distance

Falls off inversely as the square of distance

Remains unchanged with distance

Increase directly as square of distance

Ohm established a relation between

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voltage and resistance

voltage and charge

voltage and current

voltage resistance and charge

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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3/5 ohm

2 ohm

6/5 ohm

3 ohm

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

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180 watt

10 watt

20 watt

60 watt

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

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Four-fold

One-half

One-fourth

Zero

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

In bringing an electron towards another electron, electrostatic potential energy of system

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Decreases

Increases

Remains uncharged

Becomes zero

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

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5μF

10μF

3μF

6μF

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

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11/3 A

3 A

3/11 A

6

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

Electric potential of earth is taken to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

The SI unit of current is

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watt

coulomb

volt

ampere

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

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Q/4πr²

2Q/4πr²

Q.d

Zero

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

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5μF

20μF

10μF

15μF

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

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4/5Ω

5/4Ω

20Ω

0.05 Ω

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

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5

0.5

0.005

50

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

The unit of resistance is

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volt

ampere

ohm

coat

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

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2 R

R

R/2

R/4

The SI unit of permitivity is

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Nm²C²

N^-1m^-2C²

NmC²

Nm²C^-1

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

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