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 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 # 2

The unit of conductance is

Question # 3

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 # 4

The graphical representation of ohm's law is

Question # 5

The electric flux is linked with a surface will be maximum when

Question # 6

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 7

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

Question # 8

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)

Question # 9

One joule is equal to

Question # 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

Question # 11

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Question # 12

An electric charge at rest is

Question # 13

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 14

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 15

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 # 16

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

Question # 17

The fractional change in resistance per kelvin is known as

Question # 18

The capacity of a parallel plat capacitor depends on the

Question # 19

The nature of capacity of electrostatic capacitor depends on

Question # 20

Ohm's law states that

Question # 21

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

Question # 22

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 # 23

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

Question # 24

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

Question # 25

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 26

One coulomb per second is equal to

Question # 27

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

Question # 28

Electric generators which convert mechanical energy into

Question # 29

Electron volt is the unit of

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
2 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called
A. Time constant
B. Decay constant
C. None of these
D. All of above
3 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
A. -q
B. +q
C. -2q
D. +4q
4 Battery is charged in motor cars, which is based on
A. Chemical effect
B. Magnetic effect
C. Electric effect
D. None
5 The SI unit of current is
A. watt
B. coulomb
C. volt
D. ampere
6 Which of the following represents an electric current?
A. C-1
B. CS-1
C. J.S-1
D. dynes-1
7 A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
A. Charge Q
B. Potential V
C. Capacity
D. Energy U
8 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
9 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass
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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