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

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

Question # 2

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

Question # 3

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

Question # 4

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 5

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 6

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Cause of heat production in a current carrying conductor is

Question # 11

Electric generators which convert mechanical energy into

Question # 12

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

Question # 13

One coulomb of charge is created by

Question # 14

The earth's potential is taken as

Question # 15

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

Question # 16

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 17

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Question # 18

The SI unit of conductivity is

Question # 19

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

Question # 20

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 # 21

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

Question # 22

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

Question # 23

The SI unit of permitivity is

Question # 24

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 25

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

Question # 26

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

Question # 27

The conductivity of a superconductor is

Question # 28

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Question # 29

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 # 30

The unit of conductance is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
2 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
3 The electric flux is linked with a surface will be maximum when
A. The surface is held parallel to the electric field
B. The surface is held perpendicular to the electric field
C. The surface makes an angle of 45° with the electric field
D. All of the above
4 The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is
A. 10Ω
B. 20Ω
C. 30Ω
D. 40Ω
5 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
6 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
7 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
8 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
9 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
A. Coulomb's law
B. Gauss's law
C. Biot-Sarwat law
D. Ampere's law
10 The graphical representation of ohm's law is
A. hyperbola
B. straight line
C. ellipse
D. parabola

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