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 the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 2

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

Question # 3

The SI unit of current is

Question # 4

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 5

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 # 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)

Question # 7

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 8

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

Question # 9

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 10

Resistor is a device which convert electric energy to

Question # 11

The electric field will be uniform

Question # 12

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 # 13

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 14

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

Question # 15

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

Question # 16

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

Question # 17

The electric flux from a closed surface

Question # 18

Surface density of charge is defined as

Question # 19

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 # 20

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

Question # 21

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

Question # 22

One coulomb per second is equal to

Question # 23

Coulomb's force between two point charges depends upon

Question # 24

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

Question # 25

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 26

Electron volt is the unit of.

Question # 27

The SI unit of capacitance is

Question # 28

In a charged capacitor the energy is stored in

Question # 29

The electric lines of force are

Question # 30

The minimum charge on any object can not be less than

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
A. Charge Q
B. Potential V
C. Capacity
D. Energy U
2 The SI unit of electric flux is
A. Weber
B. Nm2C-1
C. NmC-1
D. Nm-2C
3 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None
4 If the two charges in Coulomb's law have double distance between them, then electric force
A. Becomes two-fold
B. Becomes four-fold
C. Remains the same
D. None of these
5 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
6 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
7 A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to
A. -q
B. +q
C. -2q
D. +4q
8 A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
A. Increase k time
B. Decreases k times
C. Decreases 1/K times
D. Remains unchanged
9 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
A. 3.9
B. 4
C. 4.2
D. 6
10 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons

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