This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part I > Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Two charges are placed 1 meter apart. If the distance between them is doubled, what happens to the force between them? A) It becomes one-fourth. B) It halves. C) It doubles. D) It remains the same. Show Answer Correct Answer: A) It becomes one-fourth. 2. Electric intensity, at any point, distant 'r' from a plane charged conducting sheet varies as: A) $r^0$. B) $r^2$. C) $r^1$. D) $r^{-1}$. Show Answer Correct Answer: A) $r^0$. 3. Two fixed point charges +4q and +q units are separated by a distance a. The point, where the resultant field intensity is zero is: A) 2/3 a. B) 1/2 a. C) 3/2 a. D) None of these. Show Answer Correct Answer: A) 2/3 a. 4. A point charge Q is far from all other charges. At a distance of 2 m from Q, the electric field is 20 N/C. What is the force a charge of 5 Coulombs feels? A) 100 N. B) 40 N. C) 4 N. D) 10 N. Show Answer Correct Answer: A) 100 N. 5. The magnitude of the electrostatic force between two point charges is F. If the distance between the charges is doubled, the electrostatic force between the charges will become A) $\frac{F}{2}$. B) $\frac{F}{4}$. C) 2F. D) 4F. Show Answer Correct Answer: B) $\frac{F}{4}$. 6. The electric field lines for a positive charge is always directed away from the charge. True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. Electric lines of force about negative point charge are A) Circular, anticlockwise. B) Radial, outward. C) Circular, clockwise. D) Radial, inward. Show Answer Correct Answer: D) Radial, inward. 8. The distance between two ions of same positive charge is 5 A$^\circ$ and electric force acting on them is 3.7 x 10$^{-9}$ N, then electron loss by each ion is ..... A) 4. B) 2. C) 3. D) 1. Show Answer Correct Answer: B) 2. 9. The direction of electric field intensity due to a dipole on equatorial point is ..... the direction of dipole moment. A) Given two directions have no relation. B) Perpendicular to. C) Same as of. D) Opposite to. Show Answer Correct Answer: D) Opposite to. 10. Charge q$_{2}$ of mass m revolves around a stationary charge q$_{1}$ in a circular orbit of radius r. The orbital periodic time of q$_{2}$ would be ..... A) $\sqrt{\frac{kq_1q_2}{4\pi^2mr^3}}$. B) $\sqrt{\frac{4\pi^2mr^3}{kq_1q_2}}$. C) $\sqrt{\frac{4\pi^2mr^2}{kq_1q_2}}$. D) $\sqrt{\frac{4\pi^2mr^4}{kq_1q_2}}$. Show Answer Correct Answer: B) $\sqrt{\frac{4\pi^2mr^3}{kq_1q_2}}$. 11. The total flux through the faces of the cube with side of length a if a charge q is placed at any one corner of the cube is A) $\left(\frac{q}{8\epsilon_0}\right)$. B) $\left(\frac{q}{6\epsilon_0}\right)$. C) $\left(\frac{q}{2\epsilon_0}\right)$. D) None of these. Show Answer Correct Answer: A) $\left(\frac{q}{8\epsilon_0}\right)$. 12. If an object has a net charge of +2e this means it has A) Gained 2 protons. B) Gained 2 electrons. C) Lost 2 electrons. D) Lost 2 protons. Show Answer Correct Answer: C) Lost 2 electrons. 13. If electrons transfer from a wool square to a pvc wand, the wool becomes ..... and the wand becomes ..... A) Positive, Negative. B) Positive, Positive. C) Negative, Positive. D) Negative, Negative. Show Answer Correct Answer: A) Positive, Negative. 14. The area of electric force around an electrically charged particle is called an ..... A) Electric Force. B) Electric Field. C) Electricity. D) Attract and Repel. Show Answer Correct Answer: B) Electric Field. 15. Two similar spheres having +Q and-Q charges are kept at a certain distance. F force acts between the two. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as(a) zero having no direction.(b) 8F towards +Q charge.(c) 8F towards-Q charge.(d) 4F towards +Q A) (d) 4F towards +Q. B) (c) 8F towards-Q charge. C) (a) zero having no direction. D) B) 8F towards +Q charge. Show Answer Correct Answer: B) (c) 8F towards-Q charge. 16. What do you call the process of charging a conductor by bringing it near another charged object? A) Conduction. B) Induction. C) Polarization. D) Neutralization. Show Answer Correct Answer: B) Induction. 17. What is the angle between the axial field and equatorial field of an electric dipole in degrees? A) 0. B) 90. C) 180. D) 45. Show Answer Correct Answer: C) 180. 18. A point charge +q is placed at the mid-point of a classroom of size L. The electric flux emerging from the classroom is: A) Zero. B) $\frac{q}{\epsilon_0}$. C) $\frac{6qL^2}{\epsilon_0}$. D) $\frac{q}{6L^2\epsilon_0}$. Show Answer Correct Answer: B) $\frac{q}{\epsilon_0}$. 19. You are travelling in a car during a thunderstorm. In order to protect yourself you would prefer to A) Touch the nearest electric pole. B) Remain in the car. C) Take shelter under a tree. D) Get out and crouch on the ground. Show Answer Correct Answer: B) Remain in the car. 20. A square sheet of side 'a' is held perpendicular to a uniform magnetic field of strength B. The magnetic flux linked with the surface is: A) $4Ba$. B) $Ba$. C) $Ba^2$. D) Zero. Show Answer Correct Answer: C) $Ba^2$. 21. A silk cloth rubbed with a glass rod has a charge $q=-1.6\times10^{-19}C$ A) $+1.6\times10^{-19}C$. B) $-1.6\times10^{19}C$. C) $-1.6\times10^{-19}C$. D) $+1.6\times10^{19}C$. Show Answer Correct Answer: A) $+1.6\times10^{-19}C$. 22. A charge q is placed at the centre of the line joining the two equal charges Q. The system of three charges will be in equilibrium, if q is equal to A) +Q/4. B) +Q/2. C) -Q/2. D) -Q/4. Show Answer Correct Answer: D) -Q/4. 23. A positively charged glass rod is brought near an uncharged pith ball pendulum. What happens to the pith ball? A) Pith ball will be attracted towards the glass rod. B) Pith ball will be repelled by the glass rod. C) The pith ball is attracted towards the rod, touches it and then thrown away. D) None of the above. Show Answer Correct Answer: C) The pith ball is attracted towards the rod, touches it and then thrown away. 24. Coulomb's law states that the force between two charged objects will ..... when the magnitude (value) of the object's charge increases. A) Decrease. B) First increase, then decrease. C) Increase. D) Stay the same. Show Answer Correct Answer: C) Increase. 25. $\phi$ $\frac{q}{\epsilon o}$ A) Coulomb's law. B) Gauss's theorem. C) Convervation of charge. D) Torque. Show Answer Correct Answer: B) Gauss's theorem. 26. Resultant force on a charge is the ..... sum of the individual forces on that charge. A) Negative. B) Scalar. C) Individual. D) Vector. Show Answer Correct Answer: D) Vector. 27. Which sentence best describes electrical conductors? A) Electrical conductors have poor heat conductors. B) Electrical conductors have electric charges that move freely. C) Electrical conductors have high tensile strength. D) Electrical conductors have low mass density. Show Answer Correct Answer: B) Electrical conductors have electric charges that move freely. 28. In the absence of other conductors, the surface charge density A) Is proportional to the charge on the conductor and its surface area. B) Inversely proportional to the charge and directly proportional to the surface area. C) Directly proportional to the charge and inversely proportional to the surface area. D) Inversely proportional to the charge and the surface area. Show Answer Correct Answer: C) Directly proportional to the charge and inversely proportional to the surface area. 29. The basic cause of quantisation of electric charge is that during rubbing only an integral number of electrons can be transferred from one body to another. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 30. Quantization of charge can be neglected at macroscopic level. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 31. What is meant by the expression action at a distance? A) The idea that things not in contact can still exert forces on one another. B) The idea that you can do your job but stay at home. C) The idea that every action has an equal and opposite reaction. D) None of the above. Show Answer Correct Answer: A) The idea that things not in contact can still exert forces on one another. 32. A point charge is placed at the center of a spherical balloon. The electric flux emerging from the balloon is: A) $\frac{q}{\epsilon_0}$. B) Zero. C) $\frac{4\pi q}{\epsilon_0}$. D) $\frac{q}{4\pi\epsilon_0}$. Show Answer Correct Answer: A) $\frac{q}{\epsilon_0}$. 33. Two like charged particles are held in place near each other. When the particles are released, what will most likely happen? A) The will accelerate towards each other. B) They will move away from each other at a constant speed. C) They will move towards each other at a constant speed. D) They will accelerate away from each other. Show Answer Correct Answer: D) They will accelerate away from each other. 34. What is the direction of the electric field for a negative charge? A) Vertical. B) Horizontal. C) Radially outward. D) Radially inward. Show Answer Correct Answer: D) Radially inward. 35. A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If high energy X-ray beam falls on: A) The ball will be deflected in the direction of field. B) The ball will be deflected opposite to the direction of field. C) The ball will not deflect at all. D) The ball will fly to infinity. Show Answer Correct Answer: A) The ball will be deflected in the direction of field. 36. Two equal and opposite charges separated by a small distance constitute a dipole.If q is the charge and 2l is the distance between the charges, then the dipole moment is, ..... A) P = l / q. B) P = 2l / q. C) P = l * q. D) P = 2l * q. Show Answer Correct Answer: D) P = 2l * q. 37. When two objects have opposite charge (+ and-), they are: A) Attracted to each other. B) Repelled by each other. C) Have no effect on each other. D) None of the above. Show Answer Correct Answer: A) Attracted to each other. 38. Definition of dielectric constant of a medium in terms of force is A) $\frac{F_{vac}}{F_{med}}$. B) $\frac{F_{med}}{F_{vac}}$. C) All the above. D) None of the above. Show Answer Correct Answer: A) $\frac{F_{vac}}{F_{med}}$. 39. The electric force between two charges changes, if we bring a third charge closer to them. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 40. An electric di-pole of moment $\overrightarrow{p}$ $\overrightarrow{E}$ A) $\overrightarrow{p}\times\\overrightarrow{E}$. B) $\overrightarrow{E}.\\overrightarrow{p}$. C) $\overrightarrow{p}.\\overrightarrow{E}$. D) $\overrightarrow{E}\times\overrightarrow{p}$. Show Answer Correct Answer: A) $\overrightarrow{p}\times\\overrightarrow{E}$. 41. Two spheres carrying charge q are hanging from a same point of suspension with the help of threads of length 1 m, in a space free from gravity. The distance between them will be ..... A) 2.0 m. B) Cannot be determined. C) 0.5 m. D) 0. Show Answer Correct Answer: A) 2.0 m. 42. Two identical conducting balls A and B have charges-Q and +3Q respectively. They are brought in contact with each other and then separated by a distance d apart. Find the nature of the Coulomb force between them A) Attractive. B) Repulsive. C) All the above. D) None of the above. Show Answer Correct Answer: B) Repulsive. 43. Electric field lines form:- A) Open loop. B) Closed loop. C) Both open and closed loop. D) None. Show Answer Correct Answer: A) Open loop. 44. Electric dipole moment is a ..... quantity. A) Ambiguous. B) Scalar. C) Vector. D) Tensor. Show Answer Correct Answer: C) Vector. 45. What is the relationship between electric field and potential difference? A) Depends on the medium. B) Inversely proportional. C) No relationship. D) Directly proportional. Show Answer Correct Answer: D) Directly proportional. 46. Which statement is true about both magnetic and electric fields? A) Like charges repel each other. B) Like charges attract each other. C) Like poles attract each other. D) None of the above. Show Answer Correct Answer: A) Like charges repel each other. 47. What is the dielectric constant of a metal? A) 12. B) Infinity. C) 0. D) -25. Show Answer Correct Answer: B) Infinity. 48. Which of the following statements is true about electric field lines? A) They start from negative charges and end on positive charges. B) They start from positive charges and end on negative charges. C) They form closed loops around charges. D) They are always parallel to each other. Show Answer Correct Answer: B) They start from positive charges and end on negative charges. 49. Electrical forces are ..... A) Dangerous. B) Visible. C) Invisible. D) Not Real. Show Answer Correct Answer: C) Invisible. 50. When objects have equal numbers of positive and negative charges, they are A) Positively charged. B) Negatively charged. C) Electrically neutral. D) Unbalanced. Show Answer Correct Answer: C) Electrically neutral. 51. Electric intensity, at any point, in between the two oppositely charged walls of a classroom depends: A) Only on the charge on the walls. B) Only on the ratio of distances of the given point from the two walls. C) Only on the ratio of charge and area of the walls. D) Only on the product of charge and area of the walls. Show Answer Correct Answer: C) Only on the ratio of charge and area of the walls. 52. Electric intensity, at any point, on the axial line of an electric di-pole in a physics lab is: A) $\frac{2p}{4\pi\epsilon_0r^2}$. B) $\frac{p}{4\pi\epsilon_0r^3}$. C) $\frac{p}{4\pi\epsilon_0r^2}$. D) $\frac{2p}{4\pi\epsilon_0r^3}$. Show Answer Correct Answer: D) $\frac{2p}{4\pi\epsilon_0r^3}$. 53. Electric flux is a ..... A) Vector quantity. B) Scalar quantity. C) Tensor. D) None. Show Answer Correct Answer: B) Scalar quantity. 54. A charge 'q' is to be divided between two objects A and B. The charges on A and B such that the force between A and B can be maximum is ..... A) Q/3. B) Q/8. C) Q/2. D) Q/4. Show Answer Correct Answer: C) Q/2. 55. Electricity is made up of: A) Molecules. B) Neutrons. C) Protons. D) Electrons. Show Answer Correct Answer: D) Electrons. 56. Charge given to a spherical conductor is uniformly distributed in its entire volume. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 57. Two point charges of +3 $\mu$C and-5 $\mu$C are placed 8 cm apart. Calculate the force between them. A) 2.34 x 10$^{-9}$ N. B) 2.34 x 10$^{-3}$ N. C) 1.88 x 10$^{-4}$ N. D) 1.88 x 10$^{-10}$ N. Show Answer Correct Answer: A) 2.34 x 10$^{-9}$ N. 58. When an object gains electrons it becomes ..... A) Neutral. B) Positively charged. C) Negatively charged. D) None of the above. Show Answer Correct Answer: C) Negatively charged. 59. Two students Aditi and Ishaan are sitting at the ends of a straight line. Another student Anika is placed at the midpoint of the line. Then the student Anika placed at the midpoint will: A) Lie at rest. B) Move towards the bigger student. C) Move towards smaller student and then come to rest. D) Move towards the bigger student and then come to rest. Show Answer Correct Answer: C) Move towards smaller student and then come to rest. 60. Electric field due to uniformly charged infinite plane sheet is independent of the distance r of the point from the charged plane sheet. True or false A) True. B) False. C) True. D) None of the above. Show Answer Correct Answer: A) True. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 1Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 2Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 4Class 12 Physics (Part I) Chapter 2 Electrostatic Potential And Capacitance QuizClass 12 Physics (Part I) Chapter 3 Current Electricity QuizClass 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism QuizClass 12 Physics (Part I) Chapter 5 Magnetism And Matter QuizClass 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books