ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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

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

Question # 2

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 # 3

Battery is charged in motor cars, which is based on

Question # 4

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The concept of field theory was put forward by

Question # 10

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

Question # 11

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 # 12

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 13

One coulomb of charge is created by

Question # 14

The relation V = IR represents

Question # 15

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 16

The resistance of a conductor does not depend on its

Question # 17

The electric intensity outside the two oppositely charged parallel metal plates is

Question # 18

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

Question # 19

Capacitance of two or more capacitors

Question # 20

The SI unit of permitivity is

Question # 21

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

Question # 22

The capacity of a parallel plat capacitor depends on the

Question # 23

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

Question # 24

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

Question # 25

If electric and gravitational force on an electron in a uniform electric field will be

Question # 26

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

Question # 27

The earth's potential is taken as

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy
A. Ve
B. V/e
C. e/V
D. 2Ve
2 Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be
A. 0.52 A
B. 1 mA
C. 0.7 mA
D. 1.4 A
3 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
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
A. Two
B. 1/2
C. Zero
D. 3/2
5 The dot product of electric field intensity E and vector area A is called
A. Electric potential
B. Electric flux
C. Electric field
D. Magnetic field
6 An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)
A. Q/4πr2
B. 2Q/4πr2
C. Q.d
D. Zero
7 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
8 The SI unit of conductivity is
A. ohm-m
B. ohm-1m-1
C. ohm-m-1
D. ohm-1m
9 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
10 The charge carriers in electrolyte are positive and negative
A. protons
B. electrons
C. ions
D. none of these

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