Question # 1

If the two charges in Coulomb's law have double distance between them, then electric force

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Becomes two-fold

Becomes four-fold

Remains the same

None of these

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 charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

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200 J

100 J

1000 J

400 J

The SI unit of permitivity is

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Nm²C²

N^-1m^-2C²

NmC²

Nm²C^-1

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

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Negative

Positive

Infinite

Zero

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

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

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8 J

16 J

4 x 10^-3J

2 x 10^-3J

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

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voltmeters

resistance

electrode

current

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

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

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1 : 2

2 : 1

1 : 4

4 : 1

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

Which one of the following has larger value of relative permitivity E_rat room temperature?

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Vaccum

Air

Glass

Water

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

The ohm's is defined as

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1 ampere / 1 volts

1 coulomb / 1 volt

1 volt / 1 ampere

1 volt / 1 coulomb

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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0.52 A

1 mA

0.7 mA

1.4 A

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

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10μF

20μF

30μF

15μF

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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V/e

eV

e/V

V

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

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

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Coulomb's law

Gauss's law

Biot-Sarwat law

Ampere's law

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

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Maximum

Minimum

Zero

Infinite

The electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

The thermistors are usually made of

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Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

One coulomb per second is equal to

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One volt

One ampere

One hom

One henry

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

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0.1 V

8 V

2 V

0.5 V

If a 40 watt light bulb burns for 2 hours. how much heat is generated

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288 x 10³J

288 x 10⁸J

288 x 10⁵J

288 x 10⁶J

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

Ohm is the unit of

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current

capacitance

energy

resistance

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

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1840 KeV

1/1840 KeV

1 KeV

920 KeV

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