ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

The current through a metallic conductor is due to the motion of

Question # 2

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

Question # 3

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

Question # 4

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 5

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?

Question # 6

Which of the following does not obey ohm's law?

Question # 7

An electric charge at rest is

Question # 8

The capacity of a parallel plat capacitor depends on the

Question # 9

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

Question # 10

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 11

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 12

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

Question # 13

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

Question # 14

The value of electrical constant of proportionality k is

Question # 15

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

Question # 16

The SI unit of capacitance is

Question # 17

The resistivity of a substance depends upon the

Question # 18

The ohm's is defined as

Question # 19

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

Question # 20

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 21

The graphical representation of ohm's law is

Question # 22

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

Question # 23

Resistor is a device which convert electric energy to

Question # 24

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 25

The electric flux from a closed surface

Question # 26

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 27

The electric field due to an infinite long thin wire at a distance R varies as

Question # 28

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 29

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

Question # 30

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Ohm established a relation between
A. voltage and resistance
B. voltage and charge
C. voltage and current
D. voltage resistance and charge
2 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
3 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
4 A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
5 The electric field due to an infinite long thin wire at a distance R varies as
A. 1/R
B. 1/R2
C. R
D. R2
6 Which one of the following causes production of heat when current is set up in a wire?
A. Fall of electrons from higher orbits to lower orbits
B. Inter-atomic collisions
C. Inter-electron collisions
D. Collisions of conduction electron with atoms
7 The SI unit of capacitance is
A. Farad
B. Henry
C. Ohm
D. Volt
8 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
9 The concept of field theory was put forward by
A. Franklin
B. Kepler
C. Oersted
D. Michael Faraday
10 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
A. 0.1 watt
B. 1 watt
C. 10 watt
D. 100 watt

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