This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part I > Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Magnetic field at the centre of a coil is B. What will be new magnetic field if the current, no. of turns and radius of the coil all are doubled? A) 2B. B) 4B. C) B/2. D) B. Show Answer Correct Answer: A) 2B. 2. A wire of fixed length is turned to form a coil of one turn. It is again turned to form a coil of three turns. If in both cases same amount of current is passed, then the ratio of the intensities of magnetic field produced at the centre of a coil will be A) 1:3. B) 9:1. C) 1:9. D) 3:1. Show Answer Correct Answer: C) 1:9. 3. The frequency of a charge particle revolving in a perpendicular uniform magnetic field is directly proportional to its velocity as A) $\sqrt{v}$. B) $\frac{1}{v}$. C) $v^0$. D) $v^2$. Show Answer Correct Answer: C) $v^0$. 4. Electrons are (a) A) A. negatively charged. B) Positively charged. C) Neutral. D) None of the above. Show Answer Correct Answer: A) A. negatively charged. 5. In Biot-Savart law the direction of dB is always A) Along r. B) Along dl. C) Perpendicular to r. D) Perpendicular to both dl and r. Show Answer Correct Answer: D) Perpendicular to both dl and r. 6. This is rock or metal that creates an invisible field around themselves. A) Quartz. B) Magnet. C) Obsidian. D) Soda can. Show Answer Correct Answer: B) Magnet. 7. What causes magnetism? A) Friction. B) Moving neutrons. C) Moving charges. D) The sun. Show Answer Correct Answer: C) Moving charges. 8. A moving coil galvanometer can be converted into an ammeter by A) Introducing a shunt resistance of large value in series. B) Introducing a shunt resistance of small value in parallel. C) Introducing a resistance of small value in series. D) Introducing a resistance of large value in parallel. Show Answer Correct Answer: B) Introducing a shunt resistance of small value in parallel. 9. Which of the following is a fundamental principle of electromagnetism related to moving charges? A) Coulomb's Law. B) Newton's Third Law. C) Pascal's Principle. D) Faraday's Law of Induction. Show Answer Correct Answer: D) Faraday's Law of Induction. 10. Current sensitivity of a galvanometer can be increased by decreasing: A) Magnetic field B. B) Area A. C) Number of turns N. D) Torsional constant K. Show Answer Correct Answer: D) Torsional constant K. 11. What is the principle of Moving Coil Galvanometer. A) Current carrying conductor in an electric field produces no force. B) Current carrying coil in an electric field experiences a force. C) Current carrying conductor in magnetic field experiences a force. D) Current carrying coil in magnetic field experiences no force. Show Answer Correct Answer: C) Current carrying conductor in magnetic field experiences a force. 12. Assertion (A):When radius of circular loop carrying current is doubled, its magnetic moment becomes four times.Reason (R):Magnetic moment depends on area of the loop. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is NOT the correct explanation of A. C) A is true but R is false. D) A is false and R is also false. Show Answer Correct Answer: B) Both A and R are true but R is NOT the correct explanation of A. 13. The deflecting torque acting on the coil of a galvanometer is A) Inversely proportional to area of the coil. B) Inversely proportional to number of turns. C) Directly proportional to the magnetic field strength. D) Inversely proportional to current flowing. Show Answer Correct Answer: C) Directly proportional to the magnetic field strength. 14. If two magnets are placed so that a north pole and a south pole are facing each other, they will ..... each other. A) Attract. B) Repel. C) Spin. D) Date. Show Answer Correct Answer: A) Attract. 15. The magnetic field due to a very long straight wire carrying a current decreases as the square of the distance from the wire. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 16. If distance between two current-carrying wires is doubled, then force between them is A) Quadrupled. B) Halved. C) Tripled. D) Doubled. Show Answer Correct Answer: B) Halved. 17. There is no change in the as a charged particle moving in a magnetic field, although magnetic force is acting on it. A) Linear momentum. B) Potential energy. C) Kinetic energy. D) None of the above. Show Answer Correct Answer: C) Kinetic energy. 18. An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true? A) The electron will be accelerated along the axis. B) The electron path will be circular about the axis. C) The electron will experience a force at 45$^\circ$ to the axis and hence execute a helical path. D) The electron will continue to move with uniform velocity along the axis of the solenoid. Show Answer Correct Answer: D) The electron will continue to move with uniform velocity along the axis of the solenoid. 19. How can u convert MCG to voltmeter A) High resistance parallel. B) High resistance series. C) Low resistance parallel. D) High resistance parallel. Show Answer Correct Answer: B) High resistance series. 20. Magnetism is a force of ..... that occurs between two ..... objects. A) Attraction or internal, electronic. B) Attraction or repulsion, magnetic. C) External or internal, magnetic. D) External or repulsion, electronic. Show Answer Correct Answer: B) Attraction or repulsion, magnetic. 21. In a moving coil galvanometer, current in the coil is A) Inversely proportional to the square root of angle of deflection. B) Directly proportional to the angle of deflection. C) Directly proportional to the square root of the angle of deflection. D) Inversely roportional to the angle of deflection. Show Answer Correct Answer: B) Directly proportional to the angle of deflection. 22. Attractive and repulsive forces between objects due to electron arrangement A) Friction. B) Static Electricity. C) Magnetism. D) Gravity. Show Answer Correct Answer: C) Magnetism. 23. Their movement creates an electric current and causes each ..... to act like a microscopic magnet. A) Crouton. B) Proton. C) Electron. D) Neutron. Show Answer Correct Answer: C) Electron. 24. Certain materials respond to magnetic fields by becoming ..... themselves. ..... is one of these materials. A) Magnetic, Plastic. B) Electronic, Iron. C) Magnetic, Iron. D) Electronic, Plastic. Show Answer Correct Answer: C) Magnetic, Iron. 25. If a charged particle moves through a magnetic field perpendicular to it A) Both momentum and energy of particle change. B) Momentum as well as energy are constant. C) Energy is constant but momentum changes. D) Momentum is constant but energy changes. Show Answer Correct Answer: C) Energy is constant but momentum changes. 26. . The radius of the circle described by a charged particle moving perpendicular to a uniform magnetic field depends on A) Its mass only. B) Its velocity only. C) Both mass and velocity. D) Neither mass nor velocity. Show Answer Correct Answer: C) Both mass and velocity. 27. A current loop placed in a non-uniform magnetic field experiences A) A force of repulsion. B) A force of attraction. C) A torque but not force. D) A force and a torque. Show Answer Correct Answer: D) A force and a torque. 28. A galvanometer of $100\Omega$ A) $0.001\Omega$. B) $0.01\Omega$. C) $10\Omega$. D) $0.10\Omega$. Show Answer Correct Answer: D) $0.10\Omega$. 29. Dave notices that a wire is magnetic and attracts metal objects, What can be concluded about the wire? A) An electric current is passing through it. B) Radiation is passing through it. C) Heat is passing through it. D) Sound waves are passing through it. Show Answer Correct Answer: A) An electric current is passing through it. 30. Some objects that normally aren't magnetic can become magnetized when connected to a circuit. Items that are magnetized in this way are called ..... A) Electrons. B) Electromagnets. C) Permanent magnets. D) Electrochromic devices. Show Answer Correct Answer: B) Electromagnets. 31. When a charge of 1C moving with velocity 1 m/s normal to a magnetic field experiences a force 1 N, then the magnitude of the magnetic field is A) 1 Gauss. B) 1 Tesla. C) 1 Orested. D) None of the above. Show Answer Correct Answer: A) 1 Gauss. 32. A straight conductor carries a current from south north. Point P and Q lie to the east and west of it at the same distance. the magnetic point at P is A) Equal to the magnetic field Q. B) Smaller than the magnetic field at Q. C) Greater then the magnetic field at Q. D) Cannot be predicted unless the value of I is known. Show Answer Correct Answer: A) Equal to the magnetic field Q. 33. Two wires of same length are shaped into a square and a circle if they carry same current, ratio of magnetic moment is: A) Pi:4. B) Pi:2. C) 2:pi. D) 4:pi. Show Answer Correct Answer: A) Pi:4. 34. How is a permanent magnet DIFFERENT from a temporary magnet? A) A permanent magnet has a magnetic field. B) A permanent magnet attracts materials made of iron. C) A permanent magnet has poles. D) A permanent magnet keeps its magnetism for a long time. Show Answer Correct Answer: D) A permanent magnet keeps its magnetism for a long time. 35. The magnetic moment of a current I carrying a circular coil of radius r and number of turns N varies as A) R$^{-3}$. B) R$^{-2}$. C) R$^{4}$. D) R$^{2}$. Show Answer Correct Answer: D) R$^{2}$. 36. An electron is moving with velocity v along the axis of a long straight solenoid carrying current I. What will be the force acting on the electron due to the magnetic field of the solenoid? A) Bev. B) BIv. C) Zero. D) None of the above. Show Answer Correct Answer: C) Zero. 37. Biot-Savart law indicates that moving electros ( velocity v) produces a magnetic field B such that A) B is perpendicular to v. B) B is parallel to v. C) It obeys inverse cube law. D) It is along the line joining the electron and point of observation. Show Answer Correct Answer: A) B is perpendicular to v. 38. What is meant by the figure of merit of a galvanometer? A) Maximum deflection on the galvanometer. B) Current required to produce unit deflection on the galvanometer. C) Voltage required to produce unit deflection on the galvanometer. D) None of the above. Show Answer Correct Answer: B) Current required to produce unit deflection on the galvanometer. 39. An electric charge q is moving with a velocity v in the direction of a magnetic field B. The magnetic force acting on the charge is A) Zero. B) Q/vB. C) QvB. D) V/qB. Show Answer Correct Answer: A) Zero. 40. Which of the following can produce a magnetic field? A) (ii) A moving charge. B) (a) A static charge. C) (iii) An accelerating mass particle. D) (iv) An oscillating body. Show Answer Correct Answer: A) (ii) A moving charge. 41. A charged particle is moving on circular path with velocity v in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius becomes A) 2 times. B) 16 times. C) 4 times. D) 8 times. Show Answer Correct Answer: C) 4 times. 42. A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon A) Area of loop. B) Value of current. C) Magnetic field. D) None of these. Show Answer Correct Answer: D) None of these. 43. A current carrying loop is placed in a uniform magnetic field. The torqe acting on it does not depend upon A) Area of loop. B) Value of current. C) Magnetic field. D) None of these. Show Answer Correct Answer: D) None of these. 44. Every magnet has both a ..... pole and a ..... pole. A) North, South. B) East, West. C) Positive, South. D) Positive, Negative. Show Answer Correct Answer: A) North, South. 45. The force experienced by a point charge moving with velocity v in presence of both electric and magnetic field A) Lorentz force. B) Centrifugal force. C) All the above. D) None of the above. Show Answer Correct Answer: A) Lorentz force. 46. When the charged particles move in a combined magnetic and electric field, then the force acting is known as ..... A) Centrifugal force. B) Centripetal force. C) Lorentz force. D) Orbital force. Show Answer Correct Answer: C) Lorentz force. 47. Assertion(A):A compass needle when placed on the magnetic north pole of the earth rotates in verticaldirection.Reason(R):The earth has only horizontal component of its magnetic field at the north pole. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is NOT the correct explanation of A. C) A is true but R is false. D) A is false and R is also false. Show Answer Correct Answer: D) A is false and R is also false. 48. A positive charge with a negative charge (North with South) creates A) Attraction. B) Repulsion. C) No Attraction or Repulsion. D) None of the above. Show Answer Correct Answer: A) Attraction. 49. Magnetism is caused by ..... A) Light waves striking certain rocks. B) Magic. C) Protons in the nucleus. D) The motion of electric charges. Show Answer Correct Answer: D) The motion of electric charges. 50. Two a-particles have the ratio of their velocities as 3:2 on entering the field. If they move in different circular paths, then the ratio of the radii of their paths is A) 9:4. B) 3:2. C) 4:9. D) 2:3. Show Answer Correct Answer: B) 3:2. 51. What you have when electrons move and allows things to move or work A) Newton. B) Protons. C) Weight. D) Electricity. Show Answer Correct Answer: D) Electricity. 52. The magnetic north pole of Earth is located in the same place as the geographic north pole of Earth A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 53. What is the equation for the force on a moving charge A) F=qvB. B) F=qv/B. C) 9.8 N/kg. D) None of the above. Show Answer Correct Answer: A) F=qvB. 54. A galvanometer has a resistance of 10 ohm and meter shows full scale deflection for a current of 4 mA. How will u convert the meter into an ammeter of range 0 to 6 A? A) 6.67 milli ohm. B) 7.5 ohm. C) 10 milli ohm. D) 6.67 ohm. Show Answer Correct Answer: A) 6.67 milli ohm. 55. A wire in the form of a circular loop, of one turn carrying a current, produces magneticinduction B at the centre. If the same wire is looped into a coil of two turns and carries thesame current, the new value of magnetic induction at the centre is A) 8 B. B) B. C) 4 B. D) 2 B. Show Answer Correct Answer: C) 4 B. 56. In magnetic materials, all of the ..... are pointing in the same direction. A) Electrons. B) Doors. C) Orbits. D) Domains. Show Answer Correct Answer: D) Domains. 57. A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the ratio frequency field is doubled? A) It will also be double. B) It will remain unchanged. C) It will he halved. D) It will be increased by four times. Show Answer Correct Answer: B) It will remain unchanged. 58. In moving coil galvanometer, the pole faces of U-shaped magnet are made concave A) To make the field radial. B) To increase the field. C) To weaken the field. D) Both (a) and (b). Show Answer Correct Answer: A) To make the field radial. 59. A current moving through a wire causes ..... A) Protons to move through the wire. B) A magnetic field. C) Alternating currents. D) Direct currents. Show Answer Correct Answer: B) A magnetic field. 60. F = qvB If the speed and charge double, what happens to the magnetic force? A) Doubles. B) Halves. C) Quadruples. D) Remains the same. Show Answer Correct Answer: C) Quadruples. 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