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

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Question # 2

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 # 3

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 4

Ohm established a relation between

Question # 5

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

Question # 6

One joule is equal to

Question # 7

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance 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 SI unit of current is

Question # 10

Heating effect caused by an electric circuit is written

Question # 11

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 12

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

Question # 13

The capacity of a parallel plat capacitor depends on the

Question # 14

Electron volt is the unit of.

Question # 15

Coulomb's force between two point charges depends upon

Question # 16

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

Question # 17

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

Question # 18

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 19

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 20

The liquid which conduct current is known as

Question # 21

One coulomb per second is equal to

Question # 22

The relation V = IR represents

Question # 23

The resistance of a conductor does not depend on its

Question # 24

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

Question # 25

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

An electric charge at rest is

Question # 30

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

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ECAT Class Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 Which one of the following has larger value of relative permitivity Erat room temperature?
A. Vaccum
B. Air
C. Glass
D. Water
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 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
5 Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become
A. -10 N
B. +10 N
C. +20 N
D. -20 N
6 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
7 A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
A. 2R
B. 4R
C. 16R
D. Zero
8 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
A. 2 R
B. R
C. R/2
D. R/4
9 If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be
A. 1/3 V
B. 2/3 V
C. 3/2 V
D. 3V
10 An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
A. V/e
B. eV
C. e/V
D. V

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