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

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

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 thermistors are usually made of

Question # 4

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

Question # 5

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

Question # 6

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 7

The unit of intensity of electric field is

Question # 8

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 # 9

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

Question # 10

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

Question # 11

Resistance of a conductor depends upon

Question # 12

The energy stored in a charge capacitor

Question # 13

The resistance of an incandescent lamp is

Question # 14

The SI unit of permitivity is

Question # 15

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

Question # 16

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

Question # 17

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 18

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 19

The value of electrical constant of proportionality k is

Question # 20

The unit of resistance is

Question # 21

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

Question # 22

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

Question # 23

The minimum charge on any object can not be less than

Question # 24

The electrode connected with the positive terminal of the current source is called

Question # 25

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 # 26

Current provided by a battery is maximum when

Question # 27

Potentiometer is more sensitive than voltmeter, because

Question # 28

The resistivity of a substance depends upon the

Question # 29

The nature of capacity of electrostatic capacitor depends on

Question # 30

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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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The SI unit of electric flux is
A. Weber
B. Nm2C-1
C. NmC-1
D. Nm-2C
2 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
3 At any point on the right bisector of the line joining two equal and opposite charges
A. At electric field is zero
B. The electric potential is zero
C. The electric potential decreases with increasing distance from the centre
D. The electric field is perpendicular to the line joining the charges
4 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
5 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of
A. power
B. current
C. resistance
D. temperature
6 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
A. negative charges
B. positive charges
C. protons
D. electrons
7 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one
8 The charge carriers in electrolyte are positive and negative
A. protons
B. electrons
C. ions
D. none of these
9 A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?
A. 3 x 1020
B. 3 x 1010
C. 6 x 1020
D. 6 x 1010
10 A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?
A. 108 g
B. 10.8 g
C. 0.8 g
D. 108/0.8 g

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