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

Coulomb's force between two point charges depends upon

Question # 2

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Question # 3

The resistivity of a substance depends upon the

Question # 4

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 5

The unit of resistance is

Question # 6

The minimum charge on any object can not be less than

Question # 7

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

Question # 8

One coulomb of charge is created by

Question # 9

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 10

Cause of heat production in a current carrying conductor is

Question # 11

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 12

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 13

The unit of intensity of electric field is

Question # 14

Thermocouple is an arrangement of two different metals

Question # 15

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

Question # 16

The unit of resistivity is

Question # 17

The energy stored in a charge capacitor

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

Electron volt is the unit of

Question # 23

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 24

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

Question # 25

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

Question # 26

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 27

The resistance of an incandescent lamp is

Question # 28

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

Question # 29

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 # 30

Electric generators which convert mechanical energy into

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A
2 106electrons are moving through a wire per second, the current developed is
A. 1.6 x 10-19
B. 1 A
C. 1.6 x 10-15 A
D. 106A
3 A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
A. 5
B. 0.5
C. 0.005
D. 50
4 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
A. 3/5 ohm
B. 2 ohm
C. 6/5 ohm
D. 3 ohm
5 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
6 A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
7 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of
A. power
B. current
C. resistance
D. temperature
8 If the length of the conductor is double and its cross sectional area is halved, its conductance will
A. Increase four fold
B. Become one-fourth
C. Become one-half
D. Remains unchanged
9 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
A. 2 R
B. R/4
C. R/2
D. R
10 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

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    fun day

    02 Mar 2023

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    18 Jun 2019

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    27 Apr 2019

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    15 Feb 2019

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