CBSE Class 12 Electric Charges and Fields Multiple Choice Questions with Answers. MCQ Questions Class 12 Electric Charges and Fields with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Electric Charges and Fields MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Electric Charges and Fields with Answers - Set - 5
Question 1:
Point charges +4q, –q and +4q are kept on the X-axis at point x = 0, x = a and x = 2a respectively. Then
(a) only –q is in stable equilibrium
(b) all the charges are in stable equilibrium
(c) all of the charges are in unstable equilibrium
(d) none of the charges is in equilibrium.
Correct Answer – (C)
Question 2 :
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E. Due to the force qE, its velocity increases from 0 to 6 m s–1 in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
(a) 2 m s–1, 4 m s–1
(b) 1 m s–1, 3 m s–1
(c) 1 m s–1, 3.5 m s–1
(d) 1.5 m s–1, 3 m s–1
Correct Answer – (B)
Question 3 :
A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre
(a) decreases as r increases for r < R and for r > R
(b) increases as r increases for r < R and for r > R
(c) zero as r increases for r < R, decreases as r increases for r > R
(d) zero as r increases for r < R, increases as r increases for r > R
Correct Answer – (C)
Question 4 :
Suppose the charge of a proton and an electron differ slightly. One of them is –e, the other is (e + De). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then De is of the order of
[Given: mass of hydrogen mh = 1.67 × 10–27 kg]
(a) 10–23 C
(b) 10–37 C
(c) 10–47 C
(d) 10–20 C
Correct Answer – (B)
Question 5 :
The ratio of electric force between two electrons to the gravitational force between them is of the order:
(a) 1042
(b) 1039
(c) 1036
(d) 1
Correct Answer – (A)
MCQ Questions Class 12 Electric Charges and Fields with Answers
Question 6 :
A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is
(a) qEy
(b) qE2y
(c) qEy 2
(d) q2Ey
Correct Answer – (A)
Question 7 :
An electric dipole is placed at an angle of 30° with an electric field intensity 2 × 105 N C–1. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is
(a) 8 mC
(b) 2 mC
(c) 5 mC
(d) 7 mC
Correct Answer – (B)
Question 8 :
Two identical charged spheres suspended from a common point by two massless strings of lengths l, are initially at a distance d (d < < l) apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity v. Then v varies as a function of the distance x between the spheres, as
(a) v ∝ x–1/2
(b) v ∝ x–1
(c) v ∝ x1/2
(d) v ∝ x
Correct Answer – (A)
Question 9 :
A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will
(a) increase four times
(b) be reduced to half
(c) remain the same
(d) be doubled
Correct Answer – (C)
Question 10 :
The minimum amount of charge observed so far is:
(a) 1 C
(b) 4.8 × 1-13 C
(c) 1.6 × 10-19 C
(d) 1.6 × 1019 C
Correct Answer – (C)
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