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

00:00
Question # 1

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 2

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 # 3

The electric field due to an infinite long thin wire at a distance R varies as

Question # 4

The capacitance of a parallel plate capacitor depends upon

Question # 5

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Coulomb's force between two point charges depends upon

Question # 10

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

Question # 11

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 12

The unit of conductance is

Question # 13

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 # 14

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 # 15

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 16

Solar cell converts sunlight directly into

Question # 17

The liquid which conduct current is known as

Question # 18

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

Question # 19

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

Question # 20

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 21

Which one of the following causes production of heat when current is set up in a wire?

Question # 22

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

Question # 23

The earth's potential is taken as

Question # 24

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 # 25

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

Question # 26

Which of the following does not obey ohm's law?

Question # 27

The SI unit of conductivity is

Question # 28

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 # 29

Physicist George Simon ohm was a

Question # 30

One coulomb per second is equal to

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
2 The electric field intensity at a point due to a point charge
A. Falls off inversely as the distance
B. Falls off inversely as the square of distance
C. Remains unchanged with distance
D. Increase directly as square of distance
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?
A. 60 W bulb
B. 100 W bulb
C. Both equally
D. None of these
4 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
5 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
6 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
7 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive
8 One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
A. 0.1 V
B. 8 V
C. 2 V
D. 0.5 V
9 A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy
A. 200 J
B. 100 J
C. 1000 J
D. 400 J
10 Electric flux is defined by the relation
A. E.A.
B. E x A
C. E/A
D. none of these

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