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

Equal charges are given to two spheres of different radii. The potential will

Question # 2

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

Question # 3

The SI unit of electric field intensity is

Question # 4

The concept of field theory was put forward by

Question # 5

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

Question # 6

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

Question # 7

Current provided by a battery is maximum when

Question # 8

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

Question # 9

The current through a metallic conductor is due to the motion of

Question # 10

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

Question # 11

An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be

Question # 12

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 # 13

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

Question # 14

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 15

Electron volt is the unit of

Question # 16

Which of the following represents an electric current?

Question # 17

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

Question # 18

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

Question # 19

The charge carriers in gases are

Question # 20

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

Question # 21

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

Question # 22

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 23

Which one of the following has larger value of relative permitivity Erat room temperature?

Question # 24

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

Question # 25

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 26

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

Question # 27

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 28

The SI unit of electric flux is

Question # 29

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

Question # 30

The SI unit of permitivity is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric field will be uniform
A. Near a positive point charge
B. Near a negative point charge
C. Between two oppositely charged parallel metal plates
D. None of above
2 A condenser of capacity 50μF is charged to 10 V.The energy stored is
A. 1.25 x 10-3J
B. 3.75 x 10-3J
C. 2.5 x 10-3J
D. 5 x 10-3J
3 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
A. 3.9
B. 4
C. 4.2
D. 6
4 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
A. Coulomb's law
B. Gauss's law
C. Biot-Sarwat law
D. Ampere's law
5 Coulomb's force between two point charges depends upon
A. Magnitude of charges
B. Distance between them
C. Medium in which they are located
D. All of the above
6 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
A. q = Q/4
B. q = Q/2
C. q = !
D. None of these
7 Ohm's law states that
A. The current through a resistor is directly proportional to the applied voltage
B. The voltage across a resistor is directly proportional to the current passing through it
C. Resistance is the constant of proportionality between the voltage and current
D. all of these
8 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one
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 When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
A. One joule
B. One erg
C. One electron volt
D. None of these

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