This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part I > Class 12 Physics (Part I) Chapter 5 Magnetism And Matter – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A compass points toward the south pole of Earth's magnetic field, located near the Earth's geographical ..... A) East. B) South. C) West. D) North. Show Answer Correct Answer: D) North. 2. Which of the following describes a motor? A) It doesn't need an electrical source to function. B) It creates mechanical energy. C) It doesn't follow the Law of Conservation of Energy. D) It converts electrical energy into mechanical energy. Show Answer Correct Answer: D) It converts electrical energy into mechanical energy. 3. What is the term for the region around a magnet where magnetic materials are attracted or repelled? A) Magnetic zone. B) Magnetic field. C) Magnetic sphere. D) Magnetic domain. Show Answer Correct Answer: B) Magnetic field. 4. Lines which represent places of constant angle of dip are called A) Isogonic lines. B) Isodynamic lines. C) Isoclinic lines. D) Isobaric lines. Show Answer Correct Answer: C) Isoclinic lines. 5. A bar magnet AB with magnetic moment M is cut into two equal parts perpendicular to its axis. What will be the magnetic moment of each part? A) 3M/4. B) M/2. C) Zero. D) M/4. Show Answer Correct Answer: B) M/2. 6. Which of the following is an example for diamagnetic substances A) Nickel. B) Iron. C) Copper. D) Aluminium. Show Answer Correct Answer: C) Copper. 7. The values of angle of dip at equator and poles are respectively A) 0 and 90 degree. B) 90 and 0 degree. C) 0 and 45 degree. D) 45 and 0 degree. Show Answer Correct Answer: A) 0 and 90 degree. 8. At the place the horizontal component of magnetic field is B and angle of dip is 60$^\circ$, the value of the horizontal component of magnetic field at equator is A) B. B) B/2. C) 2B. D) Zero. Show Answer Correct Answer: D) Zero. 9. A particle of charge Q and mass m is accelerated from rest through a potential difference V, attaining a kinetic energy K. What is the kinetic energy of a particle of charge 2Q and mass m/2 that is accelerated from rest through the same potential difference? A) 2K. B) 1/2 K. C) 1/4 K. D) K. E) 4K. Show Answer Correct Answer: A) 2K. 10. Non-magnetic materials can be can acquire magnetism when placed inside magnetic field A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 11. The continuous flow of electric charges is called A) Static electricity. B) Current electricity. C) All the above. D) None of the above. Show Answer Correct Answer: B) Current electricity. 12. SI unit of magnetic field intensity at a place is Wb / $m^2$ A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 13. What areas of a magnet have the strongest magnetic effect? A) The sides. B) The middle. C) The magnetic field lines. D) The poles. Show Answer Correct Answer: D) The poles. 14. Assertion:The poles of magnet can not be separated by breaking into two pieces. Reason:The magnetic moment will be reduced to half when a magnet is broken into two equal pieces. A) Assertion is correct, reason is correct; reason is not a correct explanation for assertion. B) Assertion is incorrect, reason is correct. C) Assertion is correct, reason is incorrect. D) Assertion is correct, reason is correct; reason is a correct explanation for assertion. Show Answer Correct Answer: A) Assertion is correct, reason is correct; reason is not a correct explanation for assertion. 15. Three needles N1 N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet, when brought close to them, will A) Attract N1 strongly, but repel N2 and N3 weakly. B) Attract all three of them. C) Attract N1 and N2 strongly but repel N3. D) Attract N1 strongly, N2 weakly and repel N3 weakly. Show Answer Correct Answer: D) Attract N1 strongly, N2 weakly and repel N3 weakly. 16. The angle between Magnetic meridian and the geographic meridian is known as A) Angle of magnetism. B) Angle of dip. C) Magnetic field declination. D) Magnetic field inclination. Show Answer Correct Answer: C) Magnetic field declination. 17. At the magnetic north pole of the earth, the value of the horizontal component of earth's magnetic field and angle of dip are respectively- A) Maximum, maximum. B) Minimum, minimum. C) Zero, maximum. D) Maximum, minimum. Show Answer Correct Answer: C) Zero, maximum. 18. What are non-magnetic materials? Provide two examples. A) Materials that contain iron; examples include steel and nickel. B) Materials that do not contain iron; examples include aluminum and wood. C) Materials that are very heavy; examples include lead and gold. D) Materials that are very light; examples include paper and plastic. Show Answer Correct Answer: B) Materials that do not contain iron; examples include aluminum and wood. 19. The nature of magnetic field inside a moving coil galvanometer is radical. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 20. Magnetic poles are always found in pairs A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. Which of the following is weakly repelled by a magnet field A) Iron. B) Copper. C) Cobalt. D) Steel. Show Answer Correct Answer: B) Copper. 22. A ferro magnetic substance is heated above its curie temperature . Which of the statements is correct? A) Ferro magnetic domains get perfectly arranged. B) Ferromagnetic domains get randomly arranged. C) Ferromagnetic domains are not at all influenced. D) Ferromagnetic materials transforms into diamagnetic substance. Show Answer Correct Answer: B) Ferromagnetic domains get randomly arranged. 23. Very large capacitors have been considered as a means for storing electrical energy. If we constructed a very large parallel-plate capacitor of plate area 1.0 m$^{2}$ using paper (k = 3.7) of thickness 1.0 mm as a dielectric, how much electrical energy would it store at a plate voltage of 5 000 V? A) 90 J. B) 45 000 J. C) 9 000 J. D) 0.41 J. Show Answer Correct Answer: D) 0.41 J. 24. An electron moving around the nucleus with an angular momentum l has a magnetic moment. A) E / 2m l. B) E l / m. C) E l / 2m. D) 2e l / m. Show Answer Correct Answer: C) E l / 2m. 25. What happens when like poles of two magnets are brought together? A) They create sparks. B) They attract each other. C) They get warmer. D) They repel each other. Show Answer Correct Answer: D) They repel each other. 26. The magnetic needle kept in a non-uniform magnetic field can experience A) Only torque. B) Only force. C) Both force and torque. D) Neither force nor torque. Show Answer Correct Answer: C) Both force and torque. 27. The magnetic field of earth is due to: A) Induction effect of the sun. B) The presence of a large magnet at the centre of the earth. C) Interaction of cosmic rays with the current of earth. D) Motion and distribution of some material in and outside the earth. Show Answer Correct Answer: D) Motion and distribution of some material in and outside the earth. 28. The domain formation is a necessary feature of A) Diamagnetism. B) Paramagnetism. C) Ferromagnetism. D) All of these. Show Answer Correct Answer: C) Ferromagnetism. 29. The outer core is in which state of matter? A) Solid. B) Liquid. C) Gas. D) None of the above. Show Answer Correct Answer: B) Liquid. 30. Which of the following properties shows the property of ferromagnetic substances? A) At low temperature ferromagnet becomes a paramagnet. B) The ferromagnetic property depends on temperature. C) At high enough temperature ferromagnet becomes a diamagnet. D) The ferromagnetic property does not depend on temperature. Show Answer Correct Answer: B) The ferromagnetic property depends on temperature. 31. BOHR MAGNETON IS GIVEN BY A) 9.27 * 10$^{-24 }$Am-2. B) 9.27 * 10$^{-22 }$Am-1. C) 9.72* 10$^{-27 }$Am-2. D) 9.24* 10$^{-27 }$Am-2. Show Answer Correct Answer: A) 9.27 * 10$^{-24 }$Am-2. 32. Magnetic moment of an electron is A) $\frac{eh2}{2\pi m}$. B) $\frac{eh}{2\pi m}$. C) $\frac{eh}{4\pi m}$. D) $\frac{eh2}{4\pi m}$. Show Answer Correct Answer: C) $\frac{eh}{4\pi m}$. 33. A magnetic bar of M magnetic moment is placed in the field of magnetic strength B, the torque acting on it is: A) $\vec{M}\cdot \vec{B}$. B) $\vec{M} \times \vec{B}$. C) $-\vec{M}\cdot \vec{B}$. D) $\vec{B} \times \vec{M}$. Show Answer Correct Answer: B) $\vec{M} \times \vec{B}$. 34. Which magnetic materials have negative susceptibility? A) Diamagnetic materials. B) Paramagnetic materials. C) Ferromagnetic materials. D) None of the above. Show Answer Correct Answer: A) Diamagnetic materials. 35. The winding of wire around a core which is connected to a source of energy is called the ..... coil. A) Primary. B) Secondary. C) Tertiary. D) None of the above. Show Answer Correct Answer: A) Primary. 36. A small magnet is pivoted to move freely in the magnetic meridian. At what place on the surface of the earth will the magnet be vertical? A) At pole. B) At the place where angle of dip is 45$^\circ$. C) At Equator. D) None of these. Show Answer Correct Answer: A) At pole. 37. A capacitor is charged by a constant current of 4.0 mA for 0.80 s. If the potential difference across the capacitor is 320 V, what is the capacitance of the capacitor? A) 32 $\mu F$. B) 5.0 $\mu F$. C) 10 $\mu F$. D) 13 $\mu F$. Show Answer Correct Answer: C) 10 $\mu F$. 38. A stationary magnet doesn't interact with A) Stationary charge. B) Moving charge. C) Magnet. D) Iron rod. Show Answer Correct Answer: A) Stationary charge. 39. Hard magnets have A) High retentivity and high coercivity. B) Low retentivity and high coercivity. C) Low retentivity and low coercivity. D) High retentivity and low coercivity. Show Answer Correct Answer: A) High retentivity and high coercivity. 40. The susceptibility of a diamagnetic material does not depend on temperature A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 41. Two unlike magnetic poles of strength 10 A-m each are held in air at a distance of 0.10 m from each other. What is the magnetic force of attraction between them? A) 3x10$^{-5}$N. B) 1x10$^{-5}$N. C) 1.5x10$^{-5}$N. D) 2.5x10$^{-5}$N. Show Answer Correct Answer: B) 1x10$^{-5}$N. 42. The time period of a thin bar magnet in earth's magnetic field is T. If the magnet is cut into two equal parts perpendicular to its length, the time period of each part in the same field will be A) T/2. B) T. C) 1.414T. D) None of the above. Show Answer Correct Answer: B) T. 43. Can iron filings stick to a magnet? A) Only if they are wet. B) Yes. C) No. D) Only if they are heated. Show Answer Correct Answer: B) Yes. 44. When freely suspended, a magnet comes to rest in the direction: A) East-West. B) North-South. C) South-East. D) South-West. Show Answer Correct Answer: B) North-South. 45. Earth's magnetic field inside a closed iron box, as compared to outside is A) More. B) Zero. C) Same. D) Less. Show Answer Correct Answer: D) Less. 46. A parallel-plate capacitor of cross-sectional area A is connected across a battery of potential difference V. A dielectric is then inserted into the capacitor. If the relative permittivity of the dielectric is 2.5 and the distance of separation between the plates is 0.050 mm, calculate the ratio of charge on the capacitor without the dielectric to the charge on the capacitor with dielectric. A) 1:4. B) 2:5. C) 1:2. D) 5:2. Show Answer Correct Answer: B) 2:5. 47. A rod of L, along east-west direction is dropped from a height H. If B be the magnetic field due to the earth at that place and angle of dip is $\theta$ A) BLH cos $\theta$. B) BL cos $\theta$. C) BL cos $\theta$. D) None of the above. Show Answer Correct Answer: B) BL cos $\theta$. 48. How can magnetic fields be used in medical imaging? A) Magnetic fields are utilized to heat tissues for faster recovery. B) Magnetic fields are used in MRI to create detailed images of the body's internal structures. C) Magnetic fields can replace X-rays in all medical procedures. D) Magnetic fields are used to generate sound waves for imaging. Show Answer Correct Answer: B) Magnetic fields are used in MRI to create detailed images of the body's internal structures. 49. A sensitive magnetic instrument can be shielded very effectively from outside fields by placing it inside a box of A) Teak wood. B) Soft iron of high permeability. C) A metal of high conductivity. D) Plastic materials. Show Answer Correct Answer: B) Soft iron of high permeability. 50. Lines of force, due to earth's horizontal magnetic field, are A) Elliptical. B) Curved lines. C) Concentric circles. D) Parallel and straight. Show Answer Correct Answer: D) Parallel and straight. 51. Gemma is trying to separate a mixture of sand and rocks. What statement is true about separating this mixture? A) She can use a sieve to separate the mixture-to prove it is a physical change. B) The mixture cannot be separated or reversed-it is a chemical change. C) Gemma can use a magnet to separate the mixture-to prove it is a chemical changge. D) She can use a filter to separate the mixture-to prove it is a physical change. Show Answer Correct Answer: A) She can use a sieve to separate the mixture-to prove it is a physical change. 52. If susceptibility is negative, then nature of material is A) Paramagnetic. B) Ferromagnetic. C) Diamagnetic. D) None of above. Show Answer Correct Answer: C) Diamagnetic. 53. Where on the surface of Earth is the vertical component of Earth's magnetic field zero? A) At north pole. B) At South pole. C) At Equator. D) None of these. Show Answer Correct Answer: C) At Equator. 54. A magnetic needle suspended parallel to a magnetic field requires root 3 J of work to turn it through 60$^\circ$. The torque needed to maintain the needle in this position will be A) 4J. B) 3J. C) 2J. D) 1 J. Show Answer Correct Answer: B) 3J. 55. What happens to a magnet's magnetic field if you cut the magnet in half? A) It disappears. B) Each half becomes a new magnet with its own North and South poles. C) The magnetic field doubles. D) The magnet becomes non-magnetic. Show Answer Correct Answer: B) Each half becomes a new magnet with its own North and South poles. 56. A paramagnetic sample shows a net magnetisation of 8 Am-1 when placed in an external magnetic field of 0.6 T at a temperature of 4K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16 K, the magnetisation will be [NCERT Exemplar](a) 32/3 Am-1(b) 2/3 Am-1(c) 6 Am-1(d) 2.4 Am-1 A) D. B) C. C) B. D) A. Show Answer Correct Answer: C) B. 57. When does a magnetic dipole possess maximum potential energy inside a magnetic field? A) Magnetic moment and magnetic field are antiparallel. B) Magnetic moment and magnetic field are parallel. C) The magnetic moment is zero. D) The magnetic field is zero. Show Answer Correct Answer: A) Magnetic moment and magnetic field are antiparallel. 58. A magnetic needle is kept in a non-uniform magnetic field. It experiences A) A torque but not a force. B) Neither a force nor a torque. C) A force and a torque. D) A force but not a torque. Show Answer Correct Answer: C) A force and a torque. 59. How can you visualize a magnetic field? A) Use iron filings or a magnetic field sensor to visualize a magnetic field. B) Observe the color of the sky during a storm. C) Look for changes in the wind direction. D) Use a compass to measure temperature changes. Show Answer Correct Answer: A) Use iron filings or a magnetic field sensor to visualize a magnetic field. 60. Which of the following is not a basic property of magnets. A) Magnet exists as a monopole. B) Attractive property. C) Directive property. D) Like poles repel and unlike poles attract. Show Answer Correct Answer: A) Magnet exists as a monopole. 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