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

The electric flux from a closed surface

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 6

The speed of randomly moving electrons depends upon

Question # 7

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

Question # 8

Thermocouple is an arrangement of two different metals

Question # 9

The unit of intensity of electric field is

Question # 10

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

Question # 11

An electric charge at rest is

Question # 12

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

Question # 13

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 # 14

The unit of conductance is

Question # 15

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

Question # 16

The capacitance of a parallel plate capacitor depends upon

Question # 17

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

Question # 18

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 # 19

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

Question # 20

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 # 21

One joule is equal to

Question # 22

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)

Question # 23

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 24

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 25

The charge carriers in electrolyte are positive and negative

Question # 26

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

Question # 27

The SI unit of permitivity is

Question # 28

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 29

The concept of field theory was put forward by

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
2 If the length of the conductor is double and its cross sectional area is halved, its conductance will
A. Increase four fold
B. Become one-fourth
C. Become one-half
D. Remains unchanged
3 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
4 A 60 W bulb operates on 220 V supply. The current flowing through the bulb is
A. 11/3 A
B. 3 A
C. 3/11 A
D. 6
5 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
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)
A. 2
B. 1
C. 0.5
D. 1.5
7 Which one of the following has larger value of relative permitivity Erat room temperature?
A. Vaccum
B. Air
C. Glass
D. Water
8 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
A. 5 volt
B. 3 volt
C. 15 volt
D. 9 volt
9 Thermocouple is an arrangement of two different metals
A. To convert heat energy in to electrical energy
B. To produce more heat
C. To convert heat energy into chemical energy
D. To convert electric energy in to heat energy
10 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy

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