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

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

Question # 2

Resistance of a conductor depends upon

Question # 3

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 4

The resistance of the given conductor can be increased by

Question # 5

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 6

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

Question # 7

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 # 8

The electric lines of force are

Question # 9

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 10

Coulomb force, when any material medium is placed between two charges

Question # 11

The dot product of electric field intensity E and vector area A is called

Question # 12

The conductivity of a superconductor is

Question # 13

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 # 14

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

Question # 15

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

Question # 16

The electric flux is linked with a surface will be maximum when

Question # 17

Some charge is being given to a conductor. Then its potential

Question # 18

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

Question # 19

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

Question # 20

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 # 21

The unit of resistance is

Question # 22

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

Question # 23

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

Question # 24

An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be

Question # 25

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

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 resistance of a conductor does not depend on its

Question # 28

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

Question # 29

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
A. one ohm
B. one joule
C. one volt
D. one ampere
2 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
3 The liquid which conduct current is known as
A. heating effect
B. chemical energy
C. electrolyte
D. ohm's law
4 The relation V = IR represents
A. Ampere law
B. Faraday's law
C. Ohm's law
D. Len's law
5 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
6 The electric field intensity at a point due to a point charge
A. Falls off inversely as the distance
B. Falls off inversely as the square of distance
C. Remains unchanged with distance
D. Increase directly as square of distance
7 Resistance of a conductor depends upon
A. the quantity of current passing through it
B. the voltage applied between its end
C. its dimensions, physical state and nature of its material
D. all of the above
8 If we increase the distance between two plates of the capacitor, the capacitance will
A. Increase
B. Decrease
C. Remain same
D. First increase then decrease
9 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
A. 25
B. 225
C. 625
D. 1250
10 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V

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