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 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A strong magnetic field is applied on a stationary electron. Then the electron A) Moves in a circular path. B) Accelerates in the direction of the field. C) Remains stationary. D) Emits radiation due to acceleration. Show Answer Correct Answer: C) Remains stationary. 2. The material used in making of the suspension wire used in moving coil galvanometer should be of ..... torsional constant and ..... elastic constant. A) Low, low. B) High, high. C) High, low. D) Low, high. Show Answer Correct Answer: D) Low, high. 3. The direction of force experienced by a current carrying conductor placed in a magnetic field is given by: A) Fleming's left hand rule. B) Fleming's right hand rule. C) Lenz's rule. D) Screw rule. Show Answer Correct Answer: A) Fleming's left hand rule. 4. On Earth, where is Magnetic North approximately located? A) The North Pole. B) New Brighton. C) The South Pole. D) The Equator. Show Answer Correct Answer: C) The South Pole. 5. If two magnets are close together, the magnetic force will be ..... A) Weak. B) Smelly. C) Strong. D) Positive. Show Answer Correct Answer: C) Strong. 6. Biot-Savart law indicates that the moving electrons (velocity $\upsilon$ A) B $\perp\\upsilon.$. B) B | | $\upsilon$. 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 $\perp\\upsilon.$. 7. How is an electromagnet different from a permanent magnet? A) An electromagnet is smaller and less powerful. B) An electromagnet's magnetism can be turned off. C) An electromagnet can be built without using metal. D) An electromagnet does not attract objects containing iron. Show Answer Correct Answer: B) An electromagnet's magnetism can be turned off. 8. A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is A) NABI$^{2}$. B) N$^{2}$ABI. C) NA$^{2}$B$^{2}$I. D) NABI. Show Answer Correct Answer: D) NABI. 9. A charged particle enters a magnetic field at a right angle of magnetic field. The path of the particle will be a/an A) Straight line. B) Ellipse. C) Helix. D) Circle. Show Answer Correct Answer: D) Circle. 10. To convert a galvanometer to ammeter a shunt S is to be connected with the galvanometer. The effective resistance of the ammeter then is A) GS/(G+S). B) (G+S)/GS. C) G+S. D) None of the above. Show Answer Correct Answer: A) GS/(G+S). 11. Which among the following rules is applicable to study the direction of force, magnetic field and current at a same instant? A) Palm rule. B) Fleming's left hand rule. C) Fleming's right hand rule. D) Right hand thumb rule. Show Answer Correct Answer: B) Fleming's left hand rule. 12. A circular coil of radius 10 cm is placed in X-Y plane, a constant current of 10 A is flowing in it in clockwise sense. The magnitude and direction of magnetic field at the centre are A) 2 $\times$ $-$. B) 2 $\pi$ $\times$ $-$. C) 2 $\pi$ $\times$. D) 2 $\times$. Show Answer Correct Answer: B) 2 $\pi$ $\times$ $-$. 13. A proton is moving in a magnetic field and experiences a force. Which of the following statements is true about the direction of this force? A) The force is in the direction of the magnetic field. B) The force is opposite to the direction of the magnetic field. C) The force is perpendicular to both the velocity of the proton and the magnetic field. D) The force is parallel to the velocity of the proton. Show Answer Correct Answer: C) The force is perpendicular to both the velocity of the proton and the magnetic field. 14. The unit of magnetic moment is A) $A^2m$. B) $Am^{-1}$. C) Am. D) $Am^2$. Show Answer Correct Answer: D) $Am^2$. 15. Regions around a magnet, where the force of magnetism acts. A) Gravitational Field. B) Magnetic Field. C) Football Field. D) Force Field. Show Answer Correct Answer: B) Magnetic Field. 16. In a certain region of space, electric field E and magnetic field B are perpendicular to eachother. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is A) EXB. B) C. C) $\frac{B}{E}$. D) $\frac{E}{B}$. Show Answer Correct Answer: D) $\frac{E}{B}$. 17. The path described by a charged particle entering perpendicular to the magnetic field is A) Circular. B) Helical. C) All the above. D) None of the above. Show Answer Correct Answer: A) Circular. 18. What is the effect on a charged particle moving in a magnetic field if its velocity is parallel to the field lines? A) It experiences no force. B) It moves in a circular path. C) It experiences maximum force. D) It accelerates. Show Answer Correct Answer: A) It experiences no force. 19. The Earth is a large magnet, what are the two poles that attract solar energy? A) East and West. B) North and South. C) South and East. D) West and North. Show Answer Correct Answer: B) North and South. 20. What happens to the magnetic field at the centre of a circular current carrying coil if we double the radius of the coil keeping the current unchanged? A) Quadrupled. B) Doubled. C) Halved. D) Remains unchanged. Show Answer Correct Answer: C) Halved. 21. What is the principle of MCG 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 coil in magnetic field experiences no force. D) Current carrying conductor in magnetic field experiences a force. Show Answer Correct Answer: D) Current carrying conductor in magnetic field experiences a force. 22. A constant current 10 A is flowing in a long conducting wire, the magnitude of the magnetic field due to the wire at a distance 100 m along the axis of the wire is A) 4 $\pi\times$. B) 2 $\pi\times$. C) 0. D) 2 $\times$. Show Answer Correct Answer: C) 0. 23. A particle carrying a charge of +e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been ..... A) The same as the original radius. B) One-half the original radius. C) Twice the original radius. D) Four times the original radius. E) One-fourth the original radius. Show Answer Correct Answer: B) One-half the original radius. 24. The conversion of a moving coil galvanometer into a voltmeter is done by A) Introducing a resistance of large value in series. B) Introducing a resistance of small value in parallel. C) Introducing a resistance of large value in parallel. D) Introducing a resistance of small value in series. Show Answer Correct Answer: A) Introducing a resistance of large value in series. 25. When a charged particle moves through a magnetic field perpendicular to its direction. Then A) Linear momentum changes. B) Kinetic energy remains constant. C) Both (A) and (B). D) Both linear momentum and kinetic energy varies. Show Answer Correct Answer: B) Kinetic energy remains constant. 26. Which rule is used to determine the direction of the magnetic field around a current-carrying wire? A) Right-hand rule. B) Left-hand rule. C) Fleming's left-hand rule. D) Fleming's right-hand rule. Show Answer Correct Answer: A) Right-hand rule. 27. Static charge is source of A and moving charge is a source of B. A and B are A) Magnetic field & Electric field. B) Electric field and Magnetic field. C) Electric field only. D) Magnetic field only. Show Answer Correct Answer: B) Electric field and Magnetic field. 28. Which of the following statements is not true regarding Biot-Savart's law A) The magnetic field is proportional to the length of the current element. B) The magnetic field is proportional to the current through the current element. C) The magnetic field is inversely proportional to the distance of the point. D) The magnetic field is proportional to the sine of the angle between the current direction and the line joining the current element and the point. Show Answer Correct Answer: C) The magnetic field is inversely proportional to the distance of the point. 29. Assertion (A):The true geographic north direction is found by using a compass needle.Reason (R):The magnetic meridian of the earth is along the axis of rotation of the earth. 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. 30. In a cyclotron, charged particles are accelerated by a magnetic field. What is the primary purpose of the magnetic field in this device? A) To keep particles in a circular path. B) To increase the speed of particles. C) To change the charge of particles. D) To cool down the particles. Show Answer Correct Answer: A) To keep particles in a circular path. 31. Lorentz Force generally refers to A) Force experienced by a charge due to combined action of electrical, magnetic field and gravitational field. B) Force experienced by a charge due to combined action of electrical fields. C) Force experienced by a charge due to combined action of electrical and magnetic fields. D) Force experienced by a charge due to action of magnetic fields. Show Answer Correct Answer: D) Force experienced by a charge due to action of magnetic fields. 32. In a certain region of space, electric fieldE and magnetic fieldB are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is A) E x B. B) E/B. C) E.B. D) B/E. Show Answer Correct Answer: B) E/B. 33. Correct unit of magnetic field is A) Tesla. B) Amperes. C) Coulombs ampere turns. D) Newton. Show Answer Correct Answer: A) Tesla. 34. A length L of wire caries a steady current I. It is bent first to form a circular plane coil of one turn. A current I flowing through it produces a magnetic field B at the centre of the coil. The same length is now bent more sharply to form a double loop of smaller radius. the magnetic field at the centre caused by the same current is A) B/2. B) 2B. C) B. D) 4B. Show Answer Correct Answer: D) 4B. 35. How are the two forces that make up electromagnetic forces related? A) Both are static. B) Both can be positive, negative, or neutral. C) Both the electric and magnetic forces are caused by the motion of charged particles such as electrons. D) Both gravity and light are caused by the motion of charged particles such as electrons. Show Answer Correct Answer: C) Both the electric and magnetic forces are caused by the motion of charged particles such as electrons. 36. The path described by the charged particle entering magnetic field with an angle other than 90 is A) Circular. B) Helical. C) All the above. D) None of the above. Show Answer Correct Answer: B) Helical. 37. Probably the most useful thing about electromagnets is that they can be turned ..... and ..... A) On, negative. B) On, off. C) Positive, negative. D) North, south. Show Answer Correct Answer: B) On, off. 38. Magnetic field due to a straight solenoid at any point inside it $B=\mu_0ni$ A) B. B) B/4. C) 2B. D) B/2. Show Answer Correct Answer: D) B/2. 39. What happens to the magnetic field around a wire if the current flowing through it is reversed? A) The magnetic field reverses direction. B) The magnetic field disappears. C) The magnetic field remains unchanged. D) The magnetic field strengthens. Show Answer Correct Answer: A) The magnetic field reverses direction. 40. Biot Savart law is used to find the magnetic field due to a current carrying A) Straight conductor. B) Element. C) Circular coil. D) Conductor. Show Answer Correct Answer: B) Element. 41. A charge moves in a circle inside a magnetic field.Time period of revolution is independent of mass of particle A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 42. Magnetic field at the centre of the current carrying circular coil varies A) Directly as square of distance. B) Inversily as distance. C) Directly as distance. D) Inversily as square of distance. Show Answer Correct Answer: B) Inversily as distance. 43. Moving a magnet next to a wire causes ..... A) An electric current. B) The wire to catch fire. C) Nonmetals to be repelled. D) A gravity wave. Show Answer Correct Answer: A) An electric current. 44. A charged particle enters the magnetic field with velocity v and in the direction of magnetic field. Which of the following is true? A) The charged particle will have same magnitude of velocity but direction changes. B) The charged particle comes to rest. C) The path of the charged particle in the magnetic field will be helical. D) The charged particle continues to move in the same direction with velocity v. Show Answer Correct Answer: D) The charged particle continues to move in the same direction with velocity v. 45. A positive charge is moving in combined gravitational and magnetic field. The charge moves without any change in velocity. If the velocity of charge is along east, then the direction of magnetic field is along A) Downwards. B) Upwards. C) North. D) South. Show Answer Correct Answer: C) North. 46. A positive charge with another positive charge (North with North or South with South) creates A) Attraction. B) Repulsion. C) No Attraction or Repulsion. D) None of the above. Show Answer Correct Answer: B) Repulsion. 47. An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true? A) Trajectory of electron is less curved. B) Trajectory of proton is less curved. C) Both trajectories are equally curved. D) Both move on straight line path. Show Answer Correct Answer: B) Trajectory of proton is less curved. 48. A magnetic field is a field of force that is produced by moving ..... charges. A) Gravitational. B) Northern. C) Positive. D) Electric. Show Answer Correct Answer: D) Electric. 49. Why does current flowing through a wire create a magnetic field? A) Because the metal in the wire attracts magnets. B) Because the draw of a wire can be stronger than the pull of Earth's magnetic field. C) Because magnetic force is another aspect of electrical force. D) Because magnets can create electricity. Show Answer Correct Answer: C) Because magnetic force is another aspect of electrical force. 50. The sensitivity of a moving coil galvanometer can be increased by decreasing A) The restoring torque per unit twist of the suspension. B) The magnetic field. C) The number of turns in the coil. D) The area of the coil. Show Answer Correct Answer: A) The restoring torque per unit twist of the suspension. 51. A moving coil galvanometer can be converted into an voltmeter 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 series. Show Answer Correct Answer: D) Introducing a resistance of large value in series. 52. The strength of the magnetic field at distance r from a long straight current carrying wire is B. The field at a distance r/2 will be A) B/4. B) B/2. C) B. D) 2B. Show Answer Correct Answer: D) 2B. 53. What condition is necessary for an electric charge to have a magnetic field around it? A) It must be motionless. B) It must be moving. C) It must be in a copper wire. D) It must be isolated from the opposite charge. Show Answer Correct Answer: B) It must be moving. 54. Magnetic field at the centre of a circular current-carrying conductor/coil is given by A) ( $\mu$. B) ( $\mu$. C) I/2r. D) ( $\mu$. Show Answer Correct Answer: A) ( $\mu$. 55. When a magnetic compass needle is carried nearby to a straight wire carrying current, then(I) the straight wire cause a noticeable deflection in the compass needle.(II) the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire A) (I) is correct. B) (II) is correct. C) Both (I) and (II) are correct. D) Neither (I) nor (II) is correct. Show Answer Correct Answer: C) Both (I) and (II) are correct. 56. Magnetic field at any point inside the straight solenoid is given as ..... Here the terms has their usual meanings. A) B = $\mu$$_{0}$/nI. B) B = $\mu$$_{0}$+nI. C) B = $\mu$$_{0}$nI. D) B = $\mu$$_{0}$+n+I. Show Answer Correct Answer: C) B = $\mu$$_{0}$nI. 57. Formula for figure of merit of galvanometer A) $\frac{k}{\left(R-G\right)\theta}$. B) $\frac{k}{\left(R+G\right)\theta}$. C) All the above. D) None of the above. Show Answer Correct Answer: B) $\frac{k}{\left(R+G\right)\theta}$. 58. If two magnets are placed so that two ..... poles or two ..... poles are facing each other, they will repel each other. A) North, West. B) External, internal. C) North, South. D) Positive, negative. Show Answer Correct Answer: C) North, South. 59. *. A conducting wire of linear mass density $\lambda$ is placed in a perpendicular magnetic field B. What should be the minimum value of the current passed through the wire so that it can hang freely in the magnetic field? A) $\lambda$Bg. B) B$\lambda$/g. C) $\lambda$g/B. D) B/$\lambda$g. Show Answer Correct Answer: C) $\lambda$g/B. 60. A long straight wire carrying a current induced magnetic induction at any place that is A) Inversely proportional to the square of the distance from the wire. B) Proportional to the distance from the wire. C) Inversely proportional to the distance from the wire. D) Independent of distance. Show Answer Correct Answer: C) Inversely proportional to the distance from the wire. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 1Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 3Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields QuizClass 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 5 Magnetism And Matter QuizClass 12 Physics (Part I) Chapter 6 Electromagnetic Induction QuizClass 12 Physics (Part I) Chapter 7 Alternating Current Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books