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

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

Question # 2

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 3

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 # 4

106electrons are moving through a wire per second, the current developed is

Question # 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

Question # 6

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

Question # 7

Electric potential of earth is taken to be zero because the earth is good

Question # 8

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

Question # 9

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 10

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

Question # 11

The minimum charge on any object can not be less than

Question # 12

The energy stored in a charge capacitor

Question # 13

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 14

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 15

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 16

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

Question # 17

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

Question # 18

Electron volt is the unit of

Question # 19

The electric lines of force are

Question # 20

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 # 21

The resistance of the given conductor can be increased by

Question # 22

Physicist George Simon ohm was a

Question # 23

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

Question # 24

The speed of randomly moving electrons depends upon

Question # 25

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

Question # 26

The charge carriers in electrolyte are positive and negative

Question # 27

The unit of resistivity is

Question # 28

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

Question # 29

The value of electrical constant of proportionality k is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
A. 3/5 ohm
B. 2 ohm
C. 6/5 ohm
D. 3 ohm
2 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
A. 1840 KeV
B. 1/1840 KeV
C. 1 KeV
D. 920 KeV
3 When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
A. One joule
B. One erg
C. One electron volt
D. None of these
4 Resistance of a conductor depends upon
A. the quantity of current passing through it
B. the voltage applied between its end
C. its dimensions, physical state and nature of its material
D. all of the above
5 In a charged capacitor the energy is stored in
A. Both in positive and negative charges
B. Positive charges
C. The edges of the capacitor plates
D. The electric field between the plates
6 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
A. 1.92 N
B. 19.2 N
C. 12 N
D. 0.192 N
7
Question Image
A. 5μF
B. 10μF
C. 3μF
D. 6μF
8 A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is
A. Zero
B. 0.5Ω
C. 1.1Ω
D. 5.0Ω
9 A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor
A. Increases
B. Decreases
C. Remain unchanged
D. Becomes infinite
10 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ

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