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

The ohm's is defined as

Question # 2

The electric field due to an infinite long thin wire at a distance R varies as

Question # 3

The SI unit of current is

Question # 4

Surface density of charge is defined as

Question # 5

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 # 6

The resistance of an incandescent lamp is

Question # 7

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

Question # 8

The conductivity of a superconductor is

Question # 9

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

Question # 10

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

Question # 11

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 12

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 13

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 14

The SI unit of permitivity is

Question # 15

The resistance of the given conductor can be increased by

Question # 16

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

Question # 17

An electric charge at rest is

Question # 18

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

Question # 19

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 20

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

Question # 21

The fractional change in resistance per kelvin is known as

Question # 22

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

Question # 23

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 # 24

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 # 25

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 # 26

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 27

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 # 28

Electric flux is defined by the relation

Question # 29

The electric flux from a closed surface

Question # 30

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
2 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
3 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)
A. 2
B. 1
C. 0.5
D. 1.5
4 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ
5 The resistance of the given conductor can be increased by
A. Increasing the area
B. Changing resistivity
C. Decreasing the length
D. None of the above because change does not matter because in any case the volume remains the same
6 The electrode connected with the positive terminal of the current source is called
A. cathode
B. anode
C. electrolyte
D. position
7 The nature of capacity of electrostatic capacitor depends on
A. Shape
B. Size
C. Thickness of plates
D. Area
8 A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
A. Increase k time
B. Decreases k times
C. Decreases 1/K times
D. Remains unchanged
9 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
10 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

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