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

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 2

The electric intensity at infinite distance from the point charge will be

Question # 3

The electric field intensity at a point due to a point charge

Question # 4

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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 # 9

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 10

The relation V = IR represents

Question # 11

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 # 12

Ohm's law states that

Question # 13

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 14

Specific resistance of a wire depends upon

Question # 15

The resistance of an incandescent lamp is

Question # 16

Resistance of a conductor is increased, the currant will

Question # 17

At any point on the right bisector of the line joining two equal and opposite charges

Question # 18

Free electrons are

Question # 19

Solar cell converts sunlight directly into

Question # 20

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

Question # 21

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

Question # 22

Electric generators which convert mechanical energy into

Question # 23

One electron volt is equal to

Question # 24

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

Question # 25

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 # 26

The unit of intensity of electric field is

Question # 27

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

Question # 28

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)

Question # 29

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor 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 If the distance of separation between two chares is increased, the electrical potential energy of the system will
A. Increase
B. Decrease
C. May increase or decrease
D. Remain the same
2 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
3 Capacitance of two or more capacitors
A. Increases in series combination
B. Increases in parallel combination
C. Remains unchanged
D. None of the above
4 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
A. 1310 W
B. 670 W
C. 810 W
D. 1210 W
5 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
6 A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is
A. 8 J
B. 16 J
C. 4 x 10-3J
D. 2 x 10-3J
7 Physicist George Simon ohm was a
A. German physical
B. French physicist
C. Chinese physicist
D. Russian physicist
8 Which one of the following has larger value of relative permitivity Erat room temperature?
A. Vaccum
B. Air
C. Glass
D. Water
9 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
10 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons

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