ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

Try The MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

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

Question # 2

106electrons are moving through a wire per second, the current developed is

Question # 3

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

Question # 4

Surface density of charge is defined as

Question # 5

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 6

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 # 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)

Question # 8

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 9

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

Question # 10

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 11

The capacity of a parallel plat capacitor depends on the

Question # 12

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

Question # 13

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

Question # 14

Physicist George Simon ohm was a

Question # 15

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None
2 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
3 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
A. 0.1 watt
B. 1 watt
C. 10 watt
D. 100 watt
4 106electrons are moving through a wire per second, the current developed is
A. 1.6 x 10-19
B. 1 A
C. 1.6 x 10-15 A
D. 106A
5 A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?
A. 3 x 1020
B. 3 x 1010
C. 6 x 1020
D. 6 x 1010
6 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
7 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
8 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
9 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
10 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
A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1

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