Question # 1

Equal charges are given to two spheres of different radii. The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

Capacitance of two or more capacitors

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Increases in series combination

Increases in parallel combination

Remains unchanged

None of the above

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 condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

The speed of randomly moving electrons depends upon

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pressure

volume

temperature

mass

Which one of the following is the unit of electric field intensity

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JC^-1

Vm^-1

Cm^-1

CJ^-1

The energy stored in a charge capacitor

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1/2CV²

1/2C²V

1/2C/V²

None of these

The relation between charge 'Q' and current 'I' is given by

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Q = I/t

Q = It

Q = I²t

Q = I²/t

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

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They have the same potential

They have the same amount of charge

They have the same capacity

They have the same shape

Resistance of a conductor depends upon

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the quantity of current passing through it

the voltage applied between its end

its dimensions, physical state and nature of its material

all of the above

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5Ω

1.1Ω

5.0Ω

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10Ω

1Ω

0.10Ω

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

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

Ohm established a relation between

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voltage and resistance

voltage and charge

voltage and current

voltage resistance and charge

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

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5μF

10μF

3μF

6μF

The potential difference across each resistance in series combination is

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same

different

zero

none of these

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

Magnetic effect at a point caused due to flow a current depend upon the

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Quantity of current

Distance from current

Both the quantity of current and distance from current element

None of the all

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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Ve

V/e

e/V

2Ve

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

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric filed varies within the cube

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

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 relation V = IR represents

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Ampere law

Faraday's law

Ohm's law

Len's law

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