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

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 2

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 3

Potentiometer is more sensitive than voltmeter, because

Question # 4

The unit of conductance is

Question # 5

Free electrons are

Question # 6

The thermistors are usually made of

Question # 7

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

Question # 8

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 # 9

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 # 10

In a charged capacitor the energy is stored in

Question # 11

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

Question # 12

The charge carriers in electrolyte are positive and negative

Question # 13

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 # 14

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

Question # 15

Which of the following represents an electric current?

Question # 16

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

Question # 17

The charge per unit time through any cross-section of a conductor is called

Question # 18

The relation V = IR represents

Question # 19

The minimum charge on any object can not be less than

Question # 20

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

Question # 21

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

Question # 22

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 # 23

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

Question # 24

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

Question # 25

Which one of the following causes production of heat when current is set up in a wire?

Question # 26

The resistance of a conductor does not depend on its

Question # 27

The resistance of an incandescent lamp is

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 value of electrical constant of proportionality k is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric flux from a closed surface
A. Is independent of the shape of the surface
B. Depends on the charge enclosed by the surface
C. Both a and b
D. None of the above
2 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
3 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
A. 7.20 N
B. 11.25 N
C. 22.50 N
D. 45.00
4 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
5 Resistance of a conductor is increased, the currant will
A. Decrease
B. Increase
C. Remain the same
D. None of these
6 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
7 A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be
A. Zero
B. 10Ω
C. 1Ω
D. 0.10Ω
8 At any point on the right bisector of the line joining two equal and opposite charges
A. At electric field is zero
B. The electric potential is zero
C. The electric potential decreases with increasing distance from the centre
D. The electric field is perpendicular to the line joining the charges
9 An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be
A. 1 MeV
B. 2 MeV
C. 4 MeV
D. 8 MeV
10 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

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