i. A positive electric charge




... Answer is (b) repels other positive charges
A charge is a basic property of matter. According to the property of charges, Like charges repel each other; while unlike charges attract each other. Thus a positive electric charge will repel other positive charges.


ii. An object gains excess negative charge after being rubbed against another object, which becomes




... Answer is (c) positively charged
If one object gains excess negative charge ( i.e. gain of electrons) after being rubbed against another object. The other Object will definitely lose electrons thus the object will excess of positive charge (proton).


iii. Two uncharged objects A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of the following statements is true about object A?




... Answer is (b) becomes positively charged
 We are given that objects B and C repel each other and object C is negatively charged. According to charge properties “ like charges repel each other “ this shows that object B is charged negatively during rubbing with object A. Thus object B becomes positively charged.


iv. When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of paper are attracted toward It. What does this observation indicate?




... Answer is (a) the rod and the paper are oppositely charged
When a Plastic Rod is rubbed with hair several time, it gets charged through the process of conduction and when it is put near some bits of paper the paper get oppositely charged through the process of Induction


v. According to Coulomb's law, what happens to the attraction of two oppositely charged objects as their distance of separation increases?




... Answer is (b) decrease
According to Coulomb's law, "the electrostatic force of Attraction or Repulsion between two charged objects is directly proportional to the product of the number of their charges and inversely proportional to the square of the separation distance between them". F=k(Q1.Q2)/r^2 As the Force and Distance between the charges vary inversely So as the distance between charged objects increases, the electrostatic force weakens by the square of their distance.


vi. The Coulomb's law is valid for the charges which are:




... Answer is (c) stationery and point charges
Coulomb’s law is valid if the point charges are at rest. It is difficult to apply Coulomb’s law when the charges are in arbitrary shape. Because we cannot determine the value of distance ‘r’ between the charges when they are in arbitrary shape.


vii. A positive and a negative charge are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is :




... Answer is (d) 16 times larger than before
According to Coulomb’s law, the electrostatic force is inversely proportional to the square of the distance between the charge i.e F ∝ 1/r^2. So if the distance was r = 4 cm before and now r=1 cm, the fore will increased by 16 times than before.


viii. Five joules of work are needed to shift 10 C of charge from one place to another. The potential difference between the places is:




... Answer is (a) 0.5 V
Given: W = work done = 5 Joules q = charge = 10 C To Find: Potential difference V = ? Solution: We Know that W= Vq Or V = W/q V = 5/10 = 1/2 = 0.5 Volts


ix.. Two small charged spheres are separated by 2mm. Which of the following would produce the greatest attractive force?




... Answer is (d) +2q and -2q
Oppositely charged objects attract each other so is in option (d) has two opposite charges
 

x.. Eclectic field lines




... Answer is (b) never cross each other
Electric lines of force never cross each other because if two lines intersect at any point then two tangents can be drawn at one point indicating two directions of the electric field, This means two directions of the electric field at the point of intersection, which is not possible.
 

xi. Capacitance is defined is




... Answer is (b) Q/V
Capacitance is the electrical property of a capacitor to store energy in the form of an electric field between two conducting plates of the capacitor. It is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. C= Q/V
 


VIP Note: If you have Learned the above MCQs, then examine yourself by taking this Simple MCQS Quiz (Click here to play the Quiz)


 
Unit 13: Electrostatics
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List of Class:10 MCQs Quizzes

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