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

Question # 2

The capacity of a parallel plat capacitor depends on the

Question # 3

Solar cell converts sunlight directly into

Question # 4

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 # 5

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

Question # 6

Magnetic effect at a point caused due to flow a current depend upon the

Question # 7

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

Question # 8

The dot product of electric field intensity E and vector area A is called

Question # 9

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

Question # 10

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

Question # 11

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 # 12

Electric generators which convert mechanical energy into

Question # 13

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 14

The graphical representation of ohm's law is

Question # 15

The relation between charge 'Q' and current 'I' is given by

Question # 16

Resistance of a conductor is increased, the currant will

Question # 17

Potentiometer is more sensitive than voltmeter, because

Question # 18

The electric lines of force are

Question # 19

In a voltmeter the conduction takes place due to

Question # 20

Electric potential of earth is taken to be zero because the earth is good

Question # 21

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

Question # 22

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

Question # 23

The electric flux from a closed surface

Question # 24

Free electrons are

Question # 25

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 26

Capacitance of two or more capacitors

Question # 27

Battery is charged in motor cars, which is based on

Question # 28

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

Question # 29

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 # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The value of electrical constant of proportionality k is
A. 9 x 109Nm2C-2
B. 9 x 10-9Nm2C-2
C. 9 x 1010Nm2C2
D. 9.85 x 10-12N-1C-2
2 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
3 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
4 The dot product of electric field intensity E and vector area A is called
A. Electric potential
B. Electric flux
C. Electric field
D. Magnetic field
5 A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be
A. 1840 KeV
B. 1/1840 KeV
C. 1 KeV
D. 920 KeV
6 The relation between charge 'Q' and current 'I' is given by
A. Q = I/t
B. Q = It
C. Q = I2t
D. Q = I2/t
7 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
8 A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
A. 200 W
B. 302.5
C. 250 W
D. 350 W
9 The unit of conductance is
A. ohm
B. meter
C. mho
D. ohm-meter
10 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
A. 1.92 N
B. 19.2 N
C. 12 N
D. 0.192 N

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