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 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An electrostatic force of 2 X 10$^{2}$. newtons is exerted on a charge of 4 coulomb at point P in an electric field. The magnitude of the electric field intensity at P is A) 50 N/C. B) 8 X 10$^{2}$ N/C. C) 5 N/C. D) 2 X 10$^{-2}$ N/C. Show Answer Correct Answer: A) 50 N/C. 2. What is the S. I. unit of electric flux? A) $\frac{N}{m^2}\times C$. B) $\frac{N^2}{m^2}\times C^2$. C) $\frac{N}{C}\times m^2$. D) $N\times m^2$. Show Answer Correct Answer: C) $\frac{N}{C}\times m^2$. 3. An electric dipole is placed at an angle of 30$^\circ$ with an electric field intensity 2 x 10$^{5}$ N/C. It experiences a torque equal to 4 N-m. The charge on the dipole, if the dipole length is 2 cm, is ..... A) 2 mC. B) 8 mC. C) 7 $\mu C$. D) 5 mC. Show Answer Correct Answer: A) 2 mC. 4. What would a negative value for F$_{e}$ mean? A) The particles are moving towards each other. B) The particles have the same charge. C) The particles have opposite charges. D) The particles are moving away from each other. Show Answer Correct Answer: C) The particles have opposite charges. 5. Two unlike charges of magnitude q are separated by a distance 2d . The potential at a point midway between them is A) $\frac{1}{4\pi\epsilon_o}$. B) $\frac{1}{4\pi\epsilon_o}\frac{2q}{d^2}$. C) Zero. D) $\frac{1}{4\pi\epsilon_o}\\frac{q}{d}$. Show Answer Correct Answer: C) Zero. 6. Solid angle is an entity which is: A) One dimensional. B) Two dimensional. C) May be either of them. D) Three dimensional. Show Answer Correct Answer: D) Three dimensional. 7. Consider three charged bodies P, Q, R . If P and Q repel each other and P attracts R, what is the nature of the force between Q and R? A) Attractive. B) Repulsive. C) No force. D) None of the above. Show Answer Correct Answer: A) Attractive. 8. A pith ball has an electric charge +2q, and it feels a force F when placed a distance d from a second pith ball with an electric charge-q. When the second pith ball is charged to-3q, the force on the pith ball is ..... A) 2F. B) 6F. C) 3F. D) F. Show Answer Correct Answer: C) 3F. 9. What will be the value of a charge q, such that when it is placed at the centre of two equal and like charges Q, the three charges are in equilibrium. A) +Q/4. B) Q/2. C) Q. D) -Q/4. Show Answer Correct Answer: D) -Q/4. 10. A glass window is placed perpendicular to the direction of sunlight. The amount of light passing through it is: A) Infinite. B) Zero. C) Minimum. D) Maximum. Show Answer Correct Answer: D) Maximum. 11. Which of the following describes the electric field around a positive point charge? A) Radially inward. B) Radially outward. C) Circular. D) No field. Show Answer Correct Answer: B) Radially outward. 12. The number of electrons in one coulomb of charge is ..... A) 6.25x10$^{21}$. B) 6.25x10$^{18}$. C) 6.25x10$^{23}$. D) 6.25x10$^{19}$. Show Answer Correct Answer: B) 6.25x10$^{18}$. 13. The property which differentiates two kinds of charges is called ..... A) Fraction of charge. B) Equality of charge. C) Polarity of charge. D) Fraction of charge. Show Answer Correct Answer: C) Polarity of charge. 14. An electric dipole placed in a non uniform electric field experiences A) Both torque and net force. B) Force only. C) Torque only. D) No torque and no force. Show Answer Correct Answer: A) Both torque and net force. 15. Ms. Josette rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other? A) The balloons will attract each other. B) The balloons will repel each other. C) The balloons will pop. D) The balloon will become colorless. Show Answer Correct Answer: B) The balloons will repel each other. 16. Which of the following describes the direction of electric field lines around a positive charge? A) Circular around the charge. B) Away from the charge. C) Towards the charge. D) No specific direction. Show Answer Correct Answer: B) Away from the charge. 17. An electric dipole is placed at an angle of 30 degree to a non uniform electric field the dipole will experience A) A torque as well as a translational force. B) A translational force only in the direction of the field. C) A translation force only in a direction normal to the direction of the field. D) A torque only. Show Answer Correct Answer: A) A torque as well as a translational force. 18. Three charges +4q, Q and q are placed in a straight line of length l at points distance O, l/2 and l, respectively. What should be Q in order to make the net force on q to be zero? A) -q. B) 4q. C) -2q. D) -q/2. Show Answer Correct Answer: A) -q. 19. Two pointy charges, one Coulomb each are separated by vacuum and placed 1 meter apart from each other. The force acting between them is ..... A) 1.6 X 10 $^{19 }$N. B) 9 X 10 $^{9 }$N. C) 9 X 10 $^{-9 }$N. D) 1.6 X 10 $^{-19 }$N. Show Answer Correct Answer: B) 9 X 10 $^{9 }$N. 20. Electric field lines contracts lengthwise, It shows A) Repulsion between same charges. B) No relation between force & contraction. C) Attraction between apposite charges. D) Electric field lines does not moves on straight path. Show Answer Correct Answer: C) Attraction between apposite charges. 21. What is the unit of electric field? A) J. B) N/m. C) C. D) V/m. Show Answer Correct Answer: D) V/m. 22. When 10$^{19}$ electrons are removed from a neutral metal plate, the electric charge on it is A) 10$^{19}$ C. B) 10$^{-19 C}$. C) -1.6 C. D) 1.6 C. Show Answer Correct Answer: D) 1.6 C. 23. The net force due to different charges around a single charge can be determined using superposition principle. True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 24. A charge particle is free to move in an electric field. It will travel A) Always along a line of force. B) Along a line of force, if its initial velocity is zero. C) Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force. D) None of the above. Show Answer Correct Answer: B) Along a line of force, if its initial velocity is zero. 25. A cell whose emf is 2V and internal resistance 0.1ohm is connected with a resistance of 3.9ohm. The voltage across the terminal will be A) 2.00V. B) 1.90V. C) 1.95V. D) 0.50V. Show Answer Correct Answer: C) 1.95V. 26. Two positively charged masses are separated by a distance, r. Which statement best describes the gravitational and electrostatic forces between the two masses? A) The gravitational force is attractive and the electrostatic force isrepulsive. B) The gravitational force is repulsive and the electrostatic force isattractive. C) Both forces are attractive. D) Both forces are repulsive. Show Answer Correct Answer: A) The gravitational force is attractive and the electrostatic force isrepulsive. 27. The electric field inside a spherical shell of uniform surface charge density is A) Constant, less than zero. B) Directly proportional to the distance from the centre. C) Zero. D) None of the above. Show Answer Correct Answer: C) Zero. 28. If the charge of 1 C is placed at a distance of 1 m from another charge of the same magnitude in a vacuum, it experiences an electrical force repulsion of magnitude ..... N. A) 9 x 10$^{9}$. B) 9 x 10$^{-9}$. C) 9 x 10$^{8}$. D) None of these. Show Answer Correct Answer: A) 9 x 10$^{9}$. 29. If two charges attract to each other, then which of the following is true? A) Both charges must be positive. B) Both charges must be negative. C) Both charges must be different. D) Both charges must be equal in value. Show Answer Correct Answer: C) Both charges must be different. 30. Conduction electrons are almost uniformly distributed within a conducting plate. When placed in an electrostatic field, the electric field 'E' within the plate A) Depends upon E. B) Depends upon $\overrightarrow{E}$. C) Depends upon the atomic number of the conducting element. D) Is zero. Show Answer Correct Answer: D) Is zero. 31. Charge on a conducting metal sphere present at:- A) On the surface of sphere. B) Inside the sphere. C) Outside the sphere. D) Both inside and outside of sphere. Show Answer Correct Answer: A) On the surface of sphere. 32. The electric field surrounding a positively charged object is A) Away from the charge. B) Toward the charge. C) All the above. D) None of the above. Show Answer Correct Answer: A) Away from the charge. 33. What will be the value of electric field at the centre of the electric dipole:- A) Zero. B) Twice the electric field due to one charge at centre. C) Half the value of electric field due to one charge at centre. D) Equal to the electric field due to one charge at centre. Show Answer Correct Answer: B) Twice the electric field due to one charge at centre. 34. Electric flux is a vector quantity. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 35. Electric field intensity due to a short dipole remains directly proportional to:(where, r $\rightarrow$ distance of a point from centre of dipole) A) $r^2$. B) $r^3$. C) $r^{-3}$. D) $r^{-2}$. Show Answer Correct Answer: C) $r^{-3}$. 36. In a science fair, a demonstration of an electric field is shown using a set of lines of force which are: A) Parallel. B) Converging. C) Diverging. D) Of some other form. Show Answer Correct Answer: A) Parallel. 37. +2C and-6C two charges are repelling each other with a force of 12N . If each charge is given-2C of charge, then the value of the force will be A) 4 N (Repulsive). B) 8 N (Repulsive). C) 4 N (Attractive). D) Zero. Show Answer Correct Answer: D) Zero. 38. A region of influence surrounding an object is best defined as: A) A force. B) A gravitational field. C) A field. D) An electric field. Show Answer Correct Answer: C) A field. 39. The accumulation of excess electric charge on an object is called A) Resistance. B) Circuit. C) Static electricity. D) Electric discharge. Show Answer Correct Answer: C) Static electricity. 40. Two oppositely charged particles are held in place near each other. When the particles are released, what will most likely happen? A) They will accelerate away from each other. B) The will accelerate towards each other. C) They will move away from each other at a constant speed. D) They will move towards each other at a constant speed. Show Answer Correct Answer: B) The will accelerate towards each other. 41. If $\int_{ }^{ }$ A) Discontinues field lines inside the surface. B) There is no net charge present inside the surface. C) Uniform electric field inside the surface. D) Charge present inside the surface. Show Answer Correct Answer: B) There is no net charge present inside the surface. 42. A hollow sphere of the charge does not produce an electric field at any: A) Interior point. B) Beyond 10m. C) Beyond 2m. D) Outer point. Show Answer Correct Answer: A) Interior point. 43. A glass rod acquires charge by rubbing it with silk cloth. The charge on glass rod is due to: A) Conduction. B) Radiation. C) Induction. D) Friction. Show Answer Correct Answer: D) Friction. 44. What happens to the electric field strength if the distance between two charges is doubled? A) It remains the same. B) It becomes one-fourth. C) It becomes half. D) It doubles. Show Answer Correct Answer: B) It becomes one-fourth. 45. When distance increases, electrostatic force ..... ; we call this relationship ..... proportional A) Decreases;directly. B) Decreases;inversely. C) Increases;inversely. D) Increases;directly. Show Answer Correct Answer: B) Decreases;inversely. 46. An electric dipole is in unstable equilibrium in the uniform electric field. The angle between its electric dipole moment and the electric field is (in degrees) A) 180. B) 0. C) 90. D) 45. Show Answer Correct Answer: A) 180. 47. When two spheres having 2Q and-Q charge are placed at a certain distance, the force acting between them is F. Now they are connected by a conducting wire and again separated from each other. How much force will act between them if the separation now is the same as before? A) $\frac{F}{2}$. B) $\frac{F}{4}$. C) F. D) $\frac{F}{8}$. Show Answer Correct Answer: D) $\frac{F}{8}$. 48. Identify the one which is not a property of electric field lines . A) Stronger the field, the closer will be the lines of force. B) Two lines of force intersect each other. C) An electric line of force starts from a positive charge and ends at a negative charge. D) The number of electric lines of force passing normally through unit area is directly proportional to the strength of the electric field. Show Answer Correct Answer: B) Two lines of force intersect each other. 49. The buildup of charges on an object is called A) Electric Current. B) Electrical Discharge. C) Magnetism. D) Static Electricity. Show Answer Correct Answer: D) Static Electricity. 50. Which is a characteristic of most electrical conductors? A) They can be cut easily. B) Positive charges move easily through them. C) Negative charges move easily through them. D) They are soft and flexible. Show Answer Correct Answer: C) Negative charges move easily through them. 51. The distance between the two charges 25 $\mu$ A) At a distance of 11 cm from 36undefinedC. B) At adistance of 5cm from 25undefinedC. C) At a distance of 5cm from 36undefinedC. D) At a distance of 10cm from 25undefinedC. Show Answer Correct Answer: B) At adistance of 5cm from 25undefinedC. 52. When a glass rod is rubbed with silk, it(a) gains electrons from silk.(b) gives electrons to silk.(c) gains protons from silk.(d) gives protons to silk. A) Gives electrons to silk. B) Gives protons to silk. C) Gains electrons from silk. D) Gains protons from silk. Show Answer Correct Answer: A) Gives electrons to silk. 53. An electron and a proton are in a uniform electric field, the ratio of their accelerations will be A) Zero. B) Unity. C) The ratio of the masses of proton and electron. D) The ratio of the masses of electron and proton. Show Answer Correct Answer: C) The ratio of the masses of proton and electron. 54. Potential at any point inside a charged hollow sphere in a physics lab: A) Is zero. B) Increases with distance from the center. C) Decreases with distance from the center. D) Is a constant. Show Answer Correct Answer: D) Is a constant. 55. An electric dipole is placed in a uniform field. The resultant force acting on it ..... A) Always be zero. B) Never be zero. C) Depends on its dipole moment. D) Depends on its relative position. Show Answer Correct Answer: A) Always be zero. 56. The electrical force between charges is strongest when the charges are A) The electric force is constant everywhere. B) Close together. C) There is no pattern. D) Far apart. Show Answer Correct Answer: B) Close together. 57. On charging a neutral Balloon its size- A) No relation between charge & size. B) Increases. C) Remains same. D) Decreases. Show Answer Correct Answer: B) Increases. 58. The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge? A) 200 V. B) 400 V. C) 50 V. D) 600 V. Show Answer Correct Answer: B) 400 V. 59. The dimensional formula of electric charge is A) $M^0L^0T^1A^{-1}$. B) $M^0L^0T^1A^1$. C) $M^0L^0T^{-1}A^1$. D) $M^0L^0T^{-1}A^{-1}$. Show Answer Correct Answer: B) $M^0L^0T^1A^1$. 60. The repulsive force between two particles of same mass and charge separated by a certain distance is equal to the weight of one of them. The distance between them is ..... m. Mass of the particle = 1.66 x 10$^{-27}$ kg, charge of the particle = 1.6 x 10$^{-19}$ C, k = 9 x 10$^{9}$ MKS, g = 10 m/s$^{2}$. A) 0.112. B) 0.115. C) 0.127. D) 0.118. Show Answer Correct Answer: D) 0.118. 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