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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 4 (37 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. As two oppositely charged particles approach each other, what happens to the electrical force between them? A) The magnitude of the electric force decreases. B) The attractive force increases. C) The repulsive force increases. D) The magnitude of their charges increases. Show Answer Correct Answer: B) The attractive force increases. 2. A student named Kabir is studying the interaction between charges. He observes that a charge q1 exerts some force on a second charge q2. A third charge q3 is brought near. Then, the force exerted by q1 and q2 will: A) Decrease in magnitude. B) Increase in magnitude. C) Remain unchanged. D) Increase, if q2 is of the same sign as q1 and will decrease, if q2 is of opposite sign. Show Answer Correct Answer: C) Remain unchanged. 3. What is the SI unit of charge? A) Ohms. B) Amperes. C) Coulombs. D) Volts. Show Answer Correct Answer: C) Coulombs. 4. There exists an electric field of 100 N/C along Z-direction. The electric flux passing through a square of 10 cm sides placed on XY plane inside the electric field is ..... A) 4.0 Nm$^{2}$/C. B) 2.0 Vm. C) 10 Vm. D) 1.0 Nm$^{2}$/C. Show Answer Correct Answer: D) 1.0 Nm$^{2}$/C. 5. Electric field, at any point, distant r (>R) from the centre of a spherically symmetric charge distribution of radius R varies: A) Inversely as $r^2$. B) Directly as r. C) Directly as $r^2$. D) Inversely as r. Show Answer Correct Answer: A) Inversely as $r^2$. 6. Two charges are placed 1 meter apart. If the distance between them is doubled, what happens to the force between them according to Coulomb's Law? A) It halves. B) It doubles. C) It becomes one-fourth. D) It remains the same. Show Answer Correct Answer: C) It becomes one-fourth. 7. What is the principle of superposition related to in the context of electric charges? A) Electric field due to a point charge. B) Charging a body. C) Conductors and insulators. D) Force between multiple charges. Show Answer Correct Answer: D) Force between multiple charges. 8. Electric flux linked with a given plane surface is maximum if the angle between the electric lines of force and the normal to the surface is: A) 0$^\circ$. B) 135$^\circ$. C) 90$^\circ$. D) 45$^\circ$. Show Answer Correct Answer: A) 0$^\circ$. 9. What variable is a Coulomb the unit for? A) Mass. B) Force. C) Charge. D) Distance. Show Answer Correct Answer: C) Charge. 10. Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is A) F / 8. B) F / 4. C) 4F. D) F/16. Show Answer Correct Answer: D) F/16. 11. A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is 1.8 x 10$^{3}$ N/C and points radially inward, what is the net charge on the sphere? A) +8.0 nC. B) -6.67 nC. C) -8.0 nC. D) +6.67 nC. Show Answer Correct Answer: C) -8.0 nC. 12. Which quantity and unit are correctly paired? A) Electric field strength and N/C. B) Electricity and Coulombs. C) Electrostatic force and electrons. D) Electric field strength and E. Show Answer Correct Answer: A) Electric field strength and N/C. 13. Charge on a body is integral multiple of $\pm$ A) Conservation of mass. B) Quantisation of charge. C) Conservation of charge. D) Conservation of energy. Show Answer Correct Answer: B) Quantisation of charge. 14. A charged particle of mass 0.003 g is held stationary in space by placing it in a downward direction of electric field of 6 x 10$^{4}$ N/C. Then, the magnitude of charge is ..... A) 5 x 10$^{-10}$ C. B) 5 x 10$^{-9}$ C. C) 5 x 10$^{4}$ C. D) 5 x 10$^{-6}$ C. Show Answer Correct Answer: A) 5 x 10$^{-10}$ C. 15. According to Coulomb's Law, The greater the separation distance between two charges the greater the magnitude of the electric force. True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 16. According to quantisation of charge q = ..... A) Ne. B) 1/e. C) N. D) E$^{2}$. Show Answer Correct Answer: A) Ne. 17. What is the SI unit used to measure force? A) Pounds. B) Grams. C) Friction. D) Newtons. Show Answer Correct Answer: D) Newtons. 18. What is the direction of the electric field for a positive charge? A) Vertical. B) Horizontal. C) Radially outward. D) Radially inward. Show Answer Correct Answer: C) Radially outward. 19. Electric field, at any point, distant r from a power line varies: A) Inversely as r. B) Inversely as $r^2$. C) Directly as r. D) Directly as $r^2$. Show Answer Correct Answer: A) Inversely as r. 20. An electron of mass M, initially at rest, moves through a certain distance in a uniform electric field in time t1, A proton of mass Mp also initially at rest takes time t2 to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio t2/t1, is nearly equal to: A) $\sqrt[]{\frac{Me}{Mp}}$. B) $\sqrt[]{\frac{Mp}{Me}}$. C) 1836. D) 1. Show Answer Correct Answer: B) $\sqrt[]{\frac{Mp}{Me}}$. 21. What is the unit of electric intensity in the context of physics? A) N c-1. B) N s-1. C) Nm. D) N C. Show Answer Correct Answer: A) N c-1. 22. The force per unit charge is known as ..... A) Electric current. B) Electric field. C) Electric potential. D) Electric space. Show Answer Correct Answer: B) Electric field. 23. Which of the following is true about electric field strength? A) It is constant everywhere. B) It is zero at the charge. C) It is stronger closer to the charge. D) It is weaker closer to the charge. Show Answer Correct Answer: C) It is stronger closer to the charge. 24. Four charges +8C, -3C, +5C and-10C are kept inside a closed surface. What will be the outgoing flux through the surface? A) 0 V-m. B) 10 V-m. C) 8 V-m. D) 26 V-m. Show Answer Correct Answer: A) 0 V-m. 25. In the process of charging, the mass of the negatively charged body- A) Remains Constant. B) Decreases. C) Increases. D) None of the above. Show Answer Correct Answer: C) Increases. 26. SI unit of electric flux is ..... A) Vm. B) N/Cm. C) V. D) N/C. Show Answer Correct Answer: A) Vm. 27. Two charges $3\times10^{-5}C$ $5\times10^4C$ A) $40\times10^{11}N$. B) $13.5\times10^{11}N$. C) $180\times10^9N$. D) $13.5\times10^{10}N$. Show Answer Correct Answer: B) $13.5\times10^{11}N$. 28. Electric charges that are unlike ..... each other. A) Attract. B) Repel. C) All the above. D) None of the above. Show Answer Correct Answer: A) Attract. 29. There is a solid sphere of radius 'R' having uniformly distributed charge. What is the relation between electric field 'E' (inside the sphere) and radius of sphere 'R' is A) $E\propto\frac{1}{R^3}$. B) $E\propto R^2$. C) $E\propto R^{-2}$. D) $E\propto R^{-1}$. Show Answer Correct Answer: A) $E\propto\frac{1}{R^3}$. 30. The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is A) K $^{2}$:1. B) 1:K. C) K:1. D) 1:K$^{2}$. Show Answer Correct Answer: C) K:1. 31. The number of electric field of lines emerged out from 1 C charge is ..... (e$_{o}$ = 8.85 x 10$^{-12}$ MKS). A) 1.13 x 10$^{11}$. B) 8.85 x 10$^{2}$. C) 9 x 10$^{9 }$. D) Infinite. Show Answer Correct Answer: A) 1.13 x 10$^{11}$. 32. A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the electric flux will ..... A) Increase. B) First decrease then increase. C) Decrease. D) Remain same. Show Answer Correct Answer: D) Remain same. 33. What does it mean when the electric field lines are close together? A) The field is strong. B) The field is weak. C) The field is positive. D) The field is negative. Show Answer Correct Answer: A) The field is strong. 34. When an electron and a proton are both placed in an electric field, ..... A) The electric forces acting on them are equal in magnitude as well as direction. B) Magnitudes of accelerations produced in them are same. C) Only the magnitudes of forces are same. D) Accelerations produced in them are same. Show Answer Correct Answer: C) Only the magnitudes of forces are same. 35. The mass of a single electron is equal to 9.109x10$^{-31}$C. True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 36. A hollow pipe of diameter D and length L is filled with water uniformly. The water flow through the pipe will be proportional to: A) D. B) There will be no flow. C) $1/D^2$. D) 1/D. Show Answer Correct Answer: C) $1/D^2$. 37. A cube of side b has a charge q at each of its vertices. The electric field due to this charge distribution at the centre of the cube will be: A) $\frac{q}{4\pi\epsilon_0b^2}$. B) $\frac{32q}{4\pi\epsilon_0b^2}$. C) $\frac{q}{4\pi\epsilon_02b^2}$. D) Zero. Show Answer Correct Answer: D) Zero. ← PreviousRelated 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 3Class 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