ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

Free electrons are

Question # 2

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

Question # 3

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

Question # 4

Resistance of a conductor is increased, the currant will

Question # 5

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

Question # 6

The SI unit of electric flux is

Question # 7

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

Question # 8

Electric flux is defined by the relation

Question # 9

The SI unit of conductivity is

Question # 10

The unit of resistivity is

Question # 11

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 # 12

Electron volt is the unit of

Question # 13

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

Question # 14

The SI unit of electric field intensity is

Question # 15

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 16

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

Question # 17

The ohm's is defined as

Question # 18

The resistance of the given conductor can be increased by

Question # 19

Thermocouple is an arrangement of two different metals

Question # 20

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

Question # 21

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

Question # 22

The conductivity of a superconductor is

Question # 23

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

Question # 24

Ohm is the unit of

Question # 25

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 26

The graphical representation of ohm's law is

Question # 27

The electric lines of force are

Question # 28

The electric field intensity at a point due to a point charge

Question # 29

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

Question # 30

Solar cell converts sunlight directly into

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 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)
A. Q/4πr2
B. 2Q/4πr2
C. Q.d
D. Zero
3 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
4 Specific resistance of a wire depends upon
A. Length
B. Cross-section area
C. Mass
D. None
5 In bringing an electron towards another electron, electrostatic potential energy of system
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
6 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
7 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
8 A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is
A. Two
B. 1/2
C. Zero
D. 3/2
9 The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as
A. voltmeters
B. resistance
C. electrode
D. current
10 The value of electrical constant of proportionality k is
A. 9 x 109Nm2C-2
B. 9 x 10-9Nm2C-2
C. 9 x 1010Nm2C2
D. 9.85 x 10-12N-1C-2

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