ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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 ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Question # 2

Cause of heat production in a current carrying conductor is

Question # 3

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 4

Resistor is a device which convert electric energy to

Question # 5

The electrode connected with the positive terminal of the current source is called

Question # 6

The electric flux is linked with a surface will be maximum when

Question # 7

The SI unit of capacitance is

Question # 8

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

Question # 9

The energy stored in a charge capacitor

Question # 10

The unit of intensity of electric field is

Question # 11

One joule is equal to

Question # 12

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 # 13

The nature of capacity of electrostatic capacitor depends on

Question # 14

Electron volt is the unit of

Question # 15

One electron volt is equal to

Question # 16

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 # 17

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

Question # 18

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

Question # 19

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 20

The capacitance of a parallel plate capacitor depends upon

Question # 21

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

Question # 22

The speed of randomly moving electrons depends upon

Question # 23

Ohm is the unit of

Question # 24

In a voltmeter the conduction takes place due to

Question # 25

The potential difference across each resistance in series combination is

Question # 26

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 27

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 28

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

Question # 29

One coulomb per second is equal to

Question # 30

Electric potential of earth is taken to be zero because the earth is good

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 The electric intensity outside the two oppositely charged parallel metal plates is
A. Maximum
B. Minimum
C. Zero
D. Infinite
3 Consider a spherical shell of metal at he centre of which a positive point charge is kept
A. The electric filed is zero outside the shell
B. The electric field is zero everywhere
C. The electric field is zero in the region inside the shell
D. The electric field is non-zero in both regions outside and inside the shell
4 The electric field intensity at a point due to a point charge
A. Falls off inversely as the distance
B. Falls off inversely as the square of distance
C. Remains unchanged with distance
D. Increase directly as square of distance
5 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
A. 180 watt
B. 10 watt
C. 20 watt
D. 60 watt
6 A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
A. 2R
B. 4R
C. 16R
D. Zero
7 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
8 The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is
A. 10Ω
B. 20Ω
C. 30Ω
D. 40Ω
9 The SI unit of permitivity is
A. Nm2C2
B. N-1m-2C2
C. NmC2
D. Nm2C-1
10 The unit of resistivity is
A. ohm
B. ohm-m2
C. ohm-meter
D. ohm-m-1

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