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

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Question # 1

The SI unit of electric field intensity is

Question # 2

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 3

One coulomb per second is equal to

Question # 4

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

Question # 5

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 # 6

At any point on the right bisector of the line joining two equal and opposite charges

Question # 7

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 # 8

Free electrons are

Question # 9

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

Question # 10

The speed of randomly moving electrons depends upon

Question # 11

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

Question # 12

Battery is charged in motor cars, which is based on

Question # 13

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 # 14

The resistance of a conductor does not depend on its

Question # 15

Resistance of a conductor depends upon

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

The unit of resistance is

Question # 20

Electron volt is the unit of.

Question # 21

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 22

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 23

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 24

The value of electrical constant of proportionality k is

Question # 25

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 # 26

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

Question # 27

Thermocouple is an arrangement of two different metals

Question # 28

The energy stored in a charge capacitor

Question # 29

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

Question # 30

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

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ECAT Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is
A. C
B. C/2
C. Zero
D. 2C
3 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
A. one ohm
B. one joule
C. one volt
D. one ampere
4 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
5 Electric potential of earth is taken to be zero because the earth is good
A. Semiconductor
B. Conductor
C. Insulator
D. Dielectric
6 The SI unit of capacitance is
A. Farad
B. Henry
C. Ohm
D. Volt
7 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)
A. Q/4πr2
B. 2Q/4πr2
C. Q.d
D. Zero
8 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
A. 25
B. 225
C. 625
D. 1250
9 The resistance of an incandescent lamp is
A. Smaller when switched on
B. Greater when switched off
C. The same whether it is switch off or switch on
D. Greater when switched on
10 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area

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