Question # 1

The graphical representation of ohm's law is

Choose an answer

hyperbola

straight line

ellipse

parabola

One joule is equal to

Choose an answer

1.6 x 10¹⁹eV

6.25 x 10¹⁸eV

1.6 x 18¹⁸eV

6.25 x 10¹⁹eV

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Choose an answer

One joule

One erg

One electron volt

None of these

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

Choose an answer

Decreases

Increases

No change

May increase or decresase

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

Choose an answer

9 x 10⁵V

9 V

8 x 10⁶V

80 V

Resistance of a conductor depends upon

Choose an answer

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

Which of the following represents an electric current?

Choose an answer

C^-1

CS^-1

J.S^-1

dynes^-1

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

Choose an answer

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

In a charged capacitor the energy is stored in

Choose an answer

Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

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

Choose an answer

Quantity of current

Distance from current

Both the quantity of current and distance from current element

None of the all

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

Choose an answer

V/e

eV

e/V

V

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

Choose an answer

Four-fold

One-half

One-fourth

Zero

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Choose an answer

Increase

Decrease

May increase or decrease

Remain the same

Electron volt is the unit of

Choose an answer

Potential difference

Energy

Resistance

Capacitance

Which one of the following causes production of heat when current is set up in a wire?

Choose an answer

Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

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

Choose an answer

180 watt

10 watt

20 watt

60 watt

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Choose an answer

1/3 V

2/3 V

3/2 V

3V

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Choose an answer

The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

Thermocouple is an arrangement of two different metals

Choose an answer

To convert heat energy in to electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electric energy in to heat energy

The ohm's is defined as

Choose an answer

1 ampere / 1 volts

1 coulomb / 1 volt

1 volt / 1 ampere

1 volt / 1 coulomb

Resistor is a device which convert electric energy to

Choose an answer

Heat energy

Chemical energy

Elastic energy

All of the above

The charge carriers in electrolyte are positive and negative

Choose an answer

protons

electrons

ions

none of these

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

Choose an answer

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

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Choose an answer

21 x 10³+ 10%

23 x 10¹+ 10%

21 x 10³+ 5%

12 x 10³+ 5%

One coulomb of charge is created by

Choose an answer

10 electrons

1.6 x 10^-19electrons

6.25 x 10¹⁸electrons

6.25 x 10²¹electrons

The value of electrical constant of proportionality k is

Choose an answer

9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

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

Choose an answer

2 R

R/4

R/2

R

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Choose an answer

positive temperature

negative temperature

absolute temperature

zero temperature

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

Choose an answer

8 J

16 J

4 x 10^-3J

2 x 10^-3J

The charge per unit time through any cross-section of a conductor is called

Choose an answer

capacitance

electric power

current

potential difference

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

Choose an answer

They have the same potential

They have the same amount of charge

They have the same capacity

They have the same shape

More Classes

Other Links

Physics ECAT Pre Engineering Chapter 12 Electrostatics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer