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

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

Question # 2

The nature of capacity of electrostatic capacitor depends on

Question # 3

The resistance of an incandescent lamp is

Question # 4

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

Question # 5

Electric flux is defined by the relation

Question # 6

The unit of resistance is

Question # 7

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 # 8

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

Question # 9

The speed of randomly moving electrons depends upon

Question # 10

The relation V = IR represents

Question # 11

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

Question # 12

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

Question # 13

Resistance of a conductor is increased, the currant will

Question # 14

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

Question # 15

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

Question # 16

The capacitance of a parallel plate capacitor depends upon

Question # 17

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

Question # 18

The electric lines of force are

Question # 19

The graphical representation of ohm's law is

Question # 20

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 # 21

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

Question # 22

Specific resistance of a wire depends upon

Question # 23

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Question # 24

Electron volt is the unit of.

Question # 25

The thermistors are usually made of

Question # 26

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 # 27

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

Question # 28

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

Question # 29

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
2 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
3 The electric flux from a closed surface
A. Is independent of the shape of the surface
B. Depends on the charge enclosed by the surface
C. Both a and b
D. None of the above
4 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
5 A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when
A. q = Q/4
B. q = Q/2
C. q = !
D. None of these
6
Question Image
A. 5μF
B. 10μF
C. 3μF
D. 6μF
7 The conductivity of a superconductor is
A. Infinite
B. Very large
C. Very small
D. Zero
8 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
A. Negative
B. Positive
C. Infinite
D. Zero
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 If electric and gravitational force on an electron in a uniform electric field will be
A. E=mg/q
B. E=q/mg
C. E=,g/q
D. E=qg/m

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