NEET Physics Electric Charges and Coulombs Law MCQs Set A

Question. A body is positively charged, it implies that
(a) there is positive as well as negative charge in the body but the positive charge is more than negative charge
(b) there is only positive charge in the body.
(c) there is equal positive and negative charge in the body but the positive charge lies in the outer regions
(d) negative charge is displaced from its position

Answer: A

Question. On rubbing, when one body gets positively charged andother negatively charged, the electrons transferred from positively charged body to negatively charged body are
(a) valence electrons only
(b) electrons of inner shells
(c) both valence electrons and electrons of inner shell
(d) yet to be established

Answer: A

Question: Quantisation of charge implies
(a) charge, which is a fraction of a coulomb is not possible.
(b) there is a minimum permissible charge on a particle
(c) charge exists on particles
(d) charge cannot be destroyed

Answer: A

Question. Answer: charge, which is a fraction of a coulomb is not possible.

Question: What happens when some charge is placed on a soap bubble?
(a) Its radius increases
(b) None of these
(c) Its radius decreases
(d) The bubble collapses

Answer: A

Question:  Which of the following statements is incorrect?
I. The charge q on a body is always given by q = ne, where n is any integer, positive or negative.
II. By convention, the charge on an electron is taken to be negative.
III. The fact that electric charge is always an integral multiple of e is termed as quantisation of charge.
IV. The quatisation of charge was experimentally demonstrated by Newton in 1912.
(a) Only IV
(b) Only I
(c) Only II
(d) Only III

Answer: A

Question: 1 C charge is equivalent to charge on how much number of protons?
(a) 6 × 10¹⁸
(b) 8 × 10²⁰
(c) 7 × 10¹⁹
(d) 9 × 10²¹

Answer: A

Question: When a body is charged by induction, then the body
(a) does not lose any charge
(b) becomes neutral
(c) loses whole of the charge on it
(d) loses part of the charge on it

Answer: A

Question: On charging by conduction, mass of a body may
(a) increase or decrease
(b) increase
(c) decreases
(d) None of these

Answer: A

Question:  Select the correct statements, Coulomb's law correctly describes the electric force that
I. binds the electrons of an atom to its nucleus.
II. binds the protons and neutrons in the nucleus of anM atom.
III. binds atoms together to form molecules.
(a) II and III
(b) I and II
(c) I and III
(d) I, II and III

Answer: A

Question: The metal knob of a gold leaf electroscope is touched witha positively charged rod. When it is taken away the leaves stay separated. Now the metal knob is touched by negatively charged rod. The separation between the leaves
(a) decreases
(b) increases
(c) remains same
(d) first increases then decreases.

Answer: A

Question:  Two identical metal spheres A and B are supported on insulating stands and placed in contact. What kind of charges will A and B develop when a negatively charged ebonite rod is brought near A?
(a) A will have a positive charge and B will have a negative charge
(b) A will have a negative charge and B will have a positive charge
(c) Both A and B will have positive charges
(d) Both A and B will have negative charges

Answer: A

Question: The force of repulsion between two electrons at a certain distance is F. The force between two protons separated by the same distance is (m_p=1836_me)
(a) F
(b) 3 F
(c) 2 F
(d) 1836 F

Answer: A

Question:  The force between two small charged spheres having charges of 1 × 10^–7 C and 2 × 10^–7 C placed 20 cm apart in air is
(a) 4.5 × 10^–3 N
(b) 5.4 × 10^–3 N
(c) 4.5 × 10^–2 N
(d) 5.4 × 10^–2 N

Answer: A

Question. On rubbing, when one body gets positively charged andother negatively charged, the electrons transferred from positively charged body to negatively charged body are
(a) valence electrons only
(b) electrons of inner shells
(c) both valence electrons and electrons of inner shell
(d) yet to be established

Answer: A

Question. Quantisation of charge implies
(a) charge, which is a fraction of a coulomb is not possible.
(b) there is a minimum permissible charge on a particle
(c) charge exists on particles
(d) charge cannot be destroyed

Answer: A

Question. What happens when some charge is placed on a soap bubble?
(a) Its radius increases
(b) None of these
(c) Its radius decreases
(d) The bubble collapses

Answer: A

Question.  Which of the following statements is incorrect?
I. The charge q on a body is always given by q = ne, where n is any integer, positive or negative.
II. By convention, the charge on an electron is taken to be negative.
III. The fact that electric charge is always an integral multiple of e is termed as quantisation of charge.
IV. The quatisation of charge was experimentally demonstrated by Newton in 1912.
(a) Only IV
(b) Only I
(c) Only II
(d) Only III

Answer: A

Question. 1 C charge is equivalent to charge on how much number of protons?
(a) 6 × 10¹⁸
(b) 8 × 10²⁰
(c) 7 × 10¹⁹
(d) 9 × 10²¹

Answer: A

Question. When a body is charged by induction, then the body
(a) does not lose any charge
(b) becomes neutral
(c) loses whole of the charge on it
(d) loses part of the charge on it

Answer: A

Question. On charging by conduction, mass of a body may
(a) increase or decrease
(b) increase
(c) decreases
(d) None of these

Answer: A

Question.  Select the correct statements, Coulomb's law correctly describes the electric force that
I. binds the electrons of an atom to its nucleus.
II. binds the protons and neutrons in the nucleus of anM atom.
III. binds atoms together to form molecules.
(a) II and III
(b) I and II
(c) I and III
(d) I, II and III

Answer: A

Question. Assertion : The property that the force with which two charges attract or repel each other are not affected by the presence of a third charge.
Reason : Force on any charge due to a number of other charge is the vector sum of all the forces on that charge due to other charges, taken one at a time.
(a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(b) Assertion is correct, reason is incorrect
(c) Assertion is incorrect, reason is correct
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. The metal knob of a gold leaf electroscope is touched witha positively charged rod. When it is taken away the leaves stay separated. Now the metal knob is touched by negatively charged rod. The separation between the leaves
(a) decreases
(b) increases
(c) remains same
(d) first increases then decreases.

Answer: A

Question.  Two identical metal spheres A and B are supported on insulating stands and placed in contact. What kind of charges will A and B develop when a negatively charged ebonite rod is brought near A?
(a) A will have a positive charge and B will have a negative charge
(b) A will have a negative charge and B will have a positive charge
(c) Both A and B will have positive charges
(d) Both A and B will have negative charges

Answer: A

Question. The force of repulsion between two electrons at a certain distance is F. The force between two protons separated by the same distance is (m_p=1836_me)
(a) F
(b) 3 F
(c) 2 F
(d) 1836 F

Answer: A

Question.  The force between two small charged spheres having charges of 1 × 10^–7 C and 2 × 10^–7 C placed 20 cm apart in air is
(a) 4.5 × 10^–3 N
(b) 5.4 × 10^–3 N
(c) 4.5 × 10^–2 N
(d) 5.4 × 10^–2 N

Answer: A

Question. Two insulated charged metalic sphere P and Q have their centres separated by a distance of 60 cm. The radii of P and Q are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is 3.2 × 10^–7 C is 
(a) 2.5 × 10^–3 N
(b) 3.5 × 10^–4 N
(c) 5.2 × 10^–4 N
(d) 1.5 × 10^–3N

Answer: A

Question. If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is
(a) –Q/4
(b) Q/4
(c) –Q/2
(d) Q/2

Answer: A

Question: Two insulated charged metalic sphere P and Q have their centres separated by a distance of 60 cm. The radii of P and Q are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is 3.2 × 10^–7 C is 
(a) None of these
(b) 3.5 × 10^–4 N
(c) 5.2 × 10^–4 N
(d) 1.5 × 10^–3 N

Answer: A

Question. If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is
(a) –Q/4
(b) Q/4
(c) –Q/2
(d) Q/2

Answer: A

Question. Two insulated charged metalic sphere P and Q have their centres separated by a distance of 60 cm. The radii of P and Q are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is 3.2 × 10^–7 C is 
(a) None of these
(b) 3.5 × 10^–4 N
(c) 5.2 × 10^–4 N
(d) 1.5 × 10^–3 N

Answer: A