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

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 # 2

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

Question # 3

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

Question # 4

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 5

Capacitance of two or more capacitors

Question # 6

The SI unit of conductivity is

Question # 7

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 8

Which one of the following has larger value of relative permitivity Erat room temperature?

Question # 9

The energy stored in a charge capacitor

Question # 10

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 11

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 # 12

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 13

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

Question # 14

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

Question # 15

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 16

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

Question # 17

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 18

The earth's potential is taken as

Question # 19

Physicist George Simon ohm was a

Question # 20

Which one of the following is the unit of electric field intensity

Question # 21

The thermistors are usually made of

Question # 22

The SI unit of electric flux is

Question # 23

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 # 24

The resistance of the given conductor can be increased by

Question # 25

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

Question # 26

Potentiometer is more sensitive than voltmeter, because

Question # 27

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

Question # 28

The liquid which conduct current is known as

Question # 29

The nature of capacity of electrostatic capacitor depends on

Question # 30

Ohm established a relation between

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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 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
3 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
4 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
5 Which of the following represents an electric current?
A. C-1
B. CS-1
C. J.S-1
D. dynes-1
6 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
7 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
8 The electric field due to an infinite long thin wire at a distance R varies as
A. 1/R
B. 1/R2
C. R
D. R2
9 Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends
A. 120 C
B. 240 C
C. 20 C
D. 4 C
10 If a 40 watt light bulb burns for 2 hours. how much heat is generated
A. 288 x 103J
B. 288 x 108J
C. 288 x 105J
D. 288 x 106J

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