ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

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 # 2

The SI unit of capacitance is

Question # 3

An electric charge at rest is

Question # 4

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

Question # 5

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 6

The SI unit of electric flux is

Question # 7

The resistance of a conductor does not depend on its

Question # 8

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

Question # 9

The SI unit of electric field intensity is

Question # 10

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

Question # 11

One joule is equal to

Question # 12

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

Question # 13

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

Question # 14

Some charge is being given to a conductor. Then its potential

Question # 15

Solar cell converts sunlight directly into

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Physicist George Simon ohm was a
A. German physical
B. French physicist
C. Chinese physicist
D. Russian physicist
2 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
3 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
4 A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
A. Electric potential at the surface of the cube is zero
B. Electric potential within the cube is zero
C. Electric filed is normal to the surface of the cube
D. Electric filed varies within the cube
5 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
A. 25
B. 225
C. 625
D. 1250
6 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
7 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy
A. Ve
B. V/e
C. e/V
D. 2Ve
8 A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above
9 If electric and gravitational force on an electron in a uniform electric field will be
A. E=mg/q
B. E=q/mg
C. E=,g/q
D. E=qg/m
10 One coulomb of charge is created by
A. 10 electrons
B. 1.6 x 10-19electrons
C. 6.25 x 1018electrons
D. 6.25 x 1021electrons

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