ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

Try The MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

Battery is charged in motor cars, which is based on

Question # 2

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 3

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 4

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

Question # 5

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

Question # 6

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 7

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

Question # 8

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 9

The nature of capacity of electrostatic capacitor depends on

Question # 10

The resistance of the given conductor can be increased by

Question # 11

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

Question # 12

The current through a metallic conductor is due to the motion of

Question # 13

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

Question # 14

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

Question # 15

Heating effect caused by an electric circuit is written

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
A. 3.9
B. 4
C. 4.2
D. 6
2 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
3 The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is
A. 25
B. 225
C. 625
D. 1250
4 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
A. Zero
B. 10Ω
C. 1Ω
D. 0.10Ω
5 The ohm's is defined as
A. 1 ampere / 1 volts
B. 1 coulomb / 1 volt
C. 1 volt / 1 ampere
D. 1 volt / 1 coulomb
6 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
7 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
8 The capacitance of a parallel plate capacitor depends upon
A. Area of the plates
B. Separation between the plates
C. Medium between the plates
D. All of the above
9 Electron volt is the unit of
A. Potential difference
B. Energy
C. Resistance
D. Capacitance
10 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
A. 2 R
B. R
C. R/2
D. R/4

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