ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

Question # 2

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

Question # 3

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

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

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

Question # 6

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

Question # 7

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

Question # 8

The SI unit of permitivity is

Question # 9

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 10

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 # 11

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 12

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 13

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

Question # 14

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

Question # 15

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 # 16

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 # 17

The unit of intensity of electric field is

Question # 18

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

Question # 19

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

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

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 # 22

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

Question # 23

Capacitance of two or more capacitors

Question # 24

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

Question # 25

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

Question # 26

Resistance of a conductor is increased, the currant will

Question # 27

One electron volt is equal to

Question # 28

Electric flux is defined by the relation

Question # 29

Which of the following represents an electric current?

Question # 30

Solar cell converts sunlight directly into

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be
A. 5μF
B. 20μF
C. 10μF
D. 15μF
2 Coulomb force, when any material medium is placed between two charges
A. Increases
B. Decreases
C. Remain unchanged
D. None of these
3 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
4 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
5 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
A. Zero
B. F/2
C. F
D. 2F
6 The SI unit of permitivity is
A. Nm2C2
B. N-1m-2C2
C. NmC2
D. Nm2C-1
7 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None
8 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
9 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
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A
10 A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
A. 200 W
B. 302.5
C. 250 W
D. 350 W

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