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

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 2

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 3

Cause of heat production in a current carrying conductor is

Question # 4

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 # 5

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 # 6

The resistance of the given conductor can be increased by

Question # 7

The value of electrical constant of proportionality k is

Question # 8

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 # 9

The unit of resistance is

Question # 10

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

Question # 11

The liquid which conduct current is known as

Question # 12

The electric flux from a closed surface

Question # 13

The conductivity of a superconductor is

Question # 14

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

Question # 15

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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 energy stored in a charge capacitor

Question # 19

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

Question # 20

Surface density of charge is defined as

Question # 21

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

Question # 22

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

Question # 23

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 24

Electron volt is the unit of

Question # 25

The dot product of electric field intensity E and vector area A is called

Question # 26

The SI unit of conductivity is

Question # 27

The SI unit of electric flux is

Question # 28

Solar cell converts sunlight directly into

Question # 29

Magnetic effect at a point caused due to flow a current depend upon the

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 Specific resistance of a wire depends upon
A. Length
B. Cross-section area
C. Mass
D. None
3 If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be
A. 0.1 watt
B. 1 watt
C. 10 watt
D. 100 watt
4 Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become
A. Zero
B. F/2
C. F
D. 2F
5 In a voltmeter the conduction takes place due to
A. Electrons only
B. Holes only
C. Electrons and holes
D. Electrons and ions
6 Cause of heat production in a current carrying conductor is
A. Collisions of free electrons with one another
B. High drift speed of free electrons
C. Collisions of free electrons with atoms or ions of conductor
D. High resistance value
7 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
8 The electrode connected with the positive terminal of the current source is called
A. cathode
B. anode
C. electrolyte
D. position
9 Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved
A. 1.92 N
B. 19.2 N
C. 12 N
D. 0.192 N
10 If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be
A. 6 ohm
B. 4 ohm
C. zero ohm
D. 1.33 ohm

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