ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Question # 2

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?

Question # 3

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 4

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

Question # 5

The graphical representation of ohm's law is

Question # 6

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 # 7

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 8

Free electrons are

Question # 9

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

Question # 10

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

Question # 11

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 # 12

One coulomb of charge is created by

Question # 13

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 # 14

Cause of heat production in a current carrying conductor is

Question # 15

An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be

Question # 16

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 17

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

The resistance of an incandescent lamp is

Question # 22

Resistor is a device which convert electric energy to

Question # 23

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

Question # 24

The charge carriers in electrolyte are positive and negative

Question # 25

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

Question # 26

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 # 27

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

Question # 28

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

Question # 29

One joule is equal to

Question # 30

The electric intensity outside the two oppositely charged parallel metal plates is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Equal charges are given to two spheres of different radii. The potential will
A. Be more on the smaller sphere
B. Be more on the bigger sphere
C. Be equal on both the sphere
D. Depend on the nature of the material of the sphere
2 Capacitance of two or more capacitors
A. Increases in series combination
B. Increases in parallel combination
C. Remains unchanged
D. None of the above
3 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2
4 Magnetic effect at a point caused due to flow a current depend upon the
A. Quantity of current
B. Distance from current
C. Both the quantity of current and distance from current element
D. None of the all
5 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
6 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
7 The SI unit of permitivity is
A. Nm2C2
B. N-1m-2C2
C. NmC2
D. Nm2C-1
8 The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is
A. 10Ω
B. 20Ω
C. 30Ω
D. 40Ω
9 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
10 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy

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