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

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

Question # 2

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 # 3

The SI unit of permitivity is

Question # 4

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Question # 5

The energy stored in a charge capacitor

Question # 6

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

Question # 7

The resistance of a conductor does not depend on its

Question # 8

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 9

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

Question # 10

The electric lines of force are

Question # 11

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

Question # 12

If electric and gravitational force on an electron in a uniform electric field will be

Question # 13

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 # 14

The speed of randomly moving electrons depends upon

Question # 15

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Electric potential of earth is taken to be zero because the earth is good
A. Semiconductor
B. Conductor
C. Insulator
D. Dielectric
2 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44
3 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
A. They have the same potential
B. They have the same amount of charge
C. They have the same capacity
D. They have the same shape
4 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive
5 The SI unit of electric flux is
A. Weber
B. Nm2C-1
C. NmC-1
D. Nm-2C
6 The SI unit of current is
A. watt
B. coulomb
C. volt
D. ampere
7 If the two charges in Coulomb's law have double distance between them, then electric force
A. Becomes two-fold
B. Becomes four-fold
C. Remains the same
D. None of these
8 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
9 If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us
A. parabola
B. straight line
C. hyper bola
D. ellipse
10 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

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