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

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 # 2

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

Question # 3

The earth's potential is taken as

Question # 4

The electric lines of force are

Question # 5

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

Question # 6

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 # 7

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

Question # 8

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 # 9

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 10

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

Question # 11

The potential difference across each resistance in series combination is

Question # 12

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

Question # 13

The unit of resistivity is

Question # 14

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 15

An electric charge at rest is

Question # 16

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 17

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

Question # 18

The SI unit of electric field intensity is

Question # 19

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

Question # 20

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

Question # 21

The charge carriers in electrolyte are positive and negative

Question # 22

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 23

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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 # 28

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 # 29

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

Question # 30

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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?
A. 60 W bulb
B. 100 W bulb
C. Both equally
D. None of these
2 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None
3 The resistance of the given conductor can be increased by
A. Increasing the area
B. Changing resistivity
C. Decreasing the length
D. None of the above because change does not matter because in any case the volume remains the same
4 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
5 Which one of the following causes production of heat when current is set up in a wire?
A. Fall of electrons from higher orbits to lower orbits
B. Inter-atomic collisions
C. Inter-electron collisions
D. Collisions of conduction electron with atoms
6 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
7 A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?
A. Zero
B. 5μC m-2
C. 20μC m-2
D. 8μC m-2
8 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
A. 7.20 N
B. 11.25 N
C. 22.50 N
D. 45.00
9 106electrons are moving through a wire per second, the current developed is
A. 1.6 x 10-19
B. 1 A
C. 1.6 x 10-15 A
D. 106A
10 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
A. 120 C
B. 240 C
C. 20 C
D. 4 C

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