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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 4 (43 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. ..... is defined as the magnetic moment associated with an electron due to its orbital motion in the first orbit of hydrogen atom. A) Bohr moment. B) Bohr magneton. C) Bohr moment. D) Bohr magnetism. Show Answer Correct Answer: B) Bohr magneton. 2. The permanent magnetic material is characterised by:- A) Narrow hysteresis loop. B) Broad hysteresis loop. C) High mechanically hardness, all over. D) Mechanically hard surface. Show Answer Correct Answer: B) Broad hysteresis loop. 3. The Earth's magnetic field acts in the direction of: A) Geographic meridian. B) Magnetic equator. C) Magnetic meridian. D) Geographic equator. Show Answer Correct Answer: D) Geographic equator. 4. At the same place, the horizontal component of earth's magnetic field is 0.40G and the angle of dip is 30$^\circ$. What is the resultant magnetic field? A) 0.12G. B) 0.36G. C) 0.14G. D) 0.46G. Show Answer Correct Answer: D) 0.46G. 5. Capacitor is a device use to store energy. Therefore a solar cell is a type of capacitor. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 6. Which of the following is most suitable for the core of an electro magnet? A) Soft iron. B) Copper. C) Steel. D) Alnico. Show Answer Correct Answer: A) Soft iron. 7. In a permanent magnet at room temperature [NCERT Exemplar](a) magnetic moment of each molecule is zero.(b) the individual molecules have non-zero magnetic moment which are all perfectly aligned.(c) domains are partially aligned.(d) domains are all perfectly aligned. Explaination:At room temperature, the permanent magnet retains ferromagnetic property for a long period of time. A) B. B) D. C) C. D) A. Show Answer Correct Answer: C) C. 8. The ratio of magnetic fields due to a small bar magnet in the end on position to the broad side on position is A) 1:1. B) 1:2. C) 2:1. D) 1:4. Show Answer Correct Answer: B) 1:2. 9. The magnetic lines of force inside a bar magnet: A) Do not exist. B) Depends on area of cross-section of bar magnet. C) Are from N-pole to S-pole of the magnet. D) Are from S-pole to N-pole of the magnet. Show Answer Correct Answer: C) Are from N-pole to S-pole of the magnet. 10. The direction of magnetic dipole moment is always from A) North pole to south pole. B) Away from North pole outside magnet. C) South pole to North Pole. D) All of the above. Show Answer Correct Answer: A) North pole to south pole. 11. Electric current passing through a wire produces ..... A) Magnetic field around wire. B) Geographic poles. C) Permanent magnet. D) Compass. Show Answer Correct Answer: A) Magnetic field around wire. 12. What is an example of a permanent magnet? A) Refrigerator magnet. B) Paperclip. C) Iron. D) A nail. Show Answer Correct Answer: A) Refrigerator magnet. 13. At present, north magnetic pole is located at a: A) Latitude of 79.74$^\circ$ N and a longitude of 71.8$^\circ$ W. B) Latitude of 71.8$^\circ$ N and a longitude of 79.74$^\circ$ W. C) Latitude of 79.74$^\circ$ S and a longitude of 108.22$^\circ$ E. D) Latitude of 108.22$^\circ$ S and a longitude of 79.74$^\circ$ E. Show Answer Correct Answer: A) Latitude of 79.74$^\circ$ N and a longitude of 71.8$^\circ$ W. 14. What is the significance of the Curie temperature? A) The Curie temperature is the point where a material becomes superconductive. B) The Curie temperature signifies the transition point where a ferromagnetic material becomes paramagnetic. C) The Curie temperature is the temperature at which all materials become ferromagnetic. D) The Curie temperature indicates the maximum temperature for magnetic storage devices. Show Answer Correct Answer: B) The Curie temperature signifies the transition point where a ferromagnetic material becomes paramagnetic. 15. A bar magnet AB with magnetic moment M is cut into two equal parts perpendicular to its axis. One part is kept over the another so that B is exactly over A. What will me the magnetic moment of the combination so formed? A) Zero. B) M. C) 3M/4. D) M/4. Show Answer Correct Answer: B) M. 16. The larger the number of field lines crossing per unit area, the Weaker is the magnitude of the magnetic field. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 17. A proton moves 10 cm on a path in the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the proton by the electrical field? A) Zero. B) -4.8 x 10$^{-20}$ J. C) .6 x 10$^{-20}$ J. D) 4.8 x 10$^{-20}$ J. Show Answer Correct Answer: D) 4.8 x 10$^{-20}$ J. 18. Hysteresis loss is minimized by using A) Alloy of steel. B) Shell type of core. C) Thick wire which has low resistance. D) Metal. Show Answer Correct Answer: D) Metal. 19. The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is: A) Equal to that of earth. B) Less than that of earth. C) Zero. D) More than that of earth. Show Answer Correct Answer: C) Zero. 20. A charged capacitor act like A) A DC open. B) A momentary open. C) A inverse voltage. D) A current source. Show Answer Correct Answer: A) A DC open. 21. Which of the following cannot be magnetised by a magnet? A) Iron nail. B) Steel nail. C) Copper nail. D) None of the above. Show Answer Correct Answer: C) Copper nail. 22. MAGNETIC MOMENT FOR BOHR MAGNETRON IS A) QVR. B) QVR/8. C) QVR/2. D) QVR/4. Show Answer Correct Answer: C) QVR/2. 23. The pole strength of a magnet depends on its: A) Cross-section. B) Nature. C) State of magnetization. D) All of the above. Show Answer Correct Answer: D) All of the above. 24. Dimensional formula of magnetic permeability A) ML$^{-1}$TA$^{-1}$. B) MLTA$^{-1}$. C) MLT$^{-1}$. D) MLT$^{-2}$A$^{-2}$. Show Answer Correct Answer: D) MLT$^{-2}$A$^{-2}$. 25. If a diamagnetic material is placed in a magnetic field, the magnetic field inside the material compared to that outside will be A) Slightly more. B) Very high. C) Same. D) Slightly less. Show Answer Correct Answer: D) Slightly less. 26. S is the surface of a lump of magnetic material.(a) Lines of B are not necessarily continuous across S.(b) Some lines of B must be discontinuous across S.(c) Lines of H are necessarily continuous across S.(d) Lines of H cannot all be continuous across S. A) D. B) B. C) A. D) C. Show Answer Correct Answer: A) D. 27. Susceptibility is positive and large for a A) Paramagnetic substance. B) Ferromagnetic substance. C) Diamagnetic substance. D) None of the above. Show Answer Correct Answer: B) Ferromagnetic substance. 28. Q2 What is unit of H? A) A/m$^{2}$. B) A. C) A/m. D) Am. Show Answer Correct Answer: C) A/m. 29. In what layer of Earth is the magnetic field generated? A) Inner Core. B) Outer Core. C) Biosphere. D) Magnetosphere. Show Answer Correct Answer: B) Outer Core. 30. What is a reversible change in matter? Give an example. A) A change that happens quickly, like exploding. B) A change that can be reversed, like melting ice into water. C) A change that happens slowly, like eroding rocks. D) A change that cannot be reversed, like burning paper. Show Answer Correct Answer: B) A change that can be reversed, like melting ice into water. 31. How do magnetic fields influence the behavior of electrons in atoms? A) Magnetic fields only influence protons, not electrons. B) Magnetic fields have no effect on electron behavior. C) Magnetic fields influence electrons by altering their trajectories and energy levels, affecting their spins and leading to phenomena like Zeeman splitting. D) Electrons are repelled by magnetic fields, causing them to scatter. Show Answer Correct Answer: C) Magnetic fields influence electrons by altering their trajectories and energy levels, affecting their spins and leading to phenomena like Zeeman splitting. 32. Gauss law for magnetism is A) The net magnetic flux through any closed surface is B. $\Delta$. B) The net magnetic flux through any closed surface is E. $\Delta$. C) The net magnetic flux through any closed surface is zero. D) Both a and c. Show Answer Correct Answer: C) The net magnetic flux through any closed surface is zero. 33. Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator(a) is always zero.(b) can be zero at specific points.(c) cannot be positive or negative.(d) is not bounded.Explaination:As the angle of dip at a point on the geographical equator is bounded in a range from positive to negative value. A) A. B) B. C) D. D) C. Show Answer Correct Answer: B) B. 34. What is an irreversible change? Give an example. A) A change that happens in nature, like rusting. B) A change that happens under pressure, like melting. C) A change that cannot be reversed, like burning paper. D) A change that can be reversed, like freezing water. Show Answer Correct Answer: C) A change that cannot be reversed, like burning paper. 35. How do magnetic fields affect charged particles? A) Magnetic fields attract charged particles to a single point. B) Magnetic fields cause charged particles to move in circular or helical paths. C) Magnetic fields have no effect on the motion of charged particles. D) Magnetic fields cause charged particles to move in straight lines. Show Answer Correct Answer: B) Magnetic fields cause charged particles to move in circular or helical paths. 36. The value of dip angle at a place where the horizontal component of earth's magnetic field is $\sqrt{3}$ A) 45 degree. B) 60 degree. C) 30 degree. D) $\tan^{-1}\left(\sqrt{3}\right)$. Show Answer Correct Answer: C) 30 degree. 37. The primary origin of magnetism lies in A) Atomic current and intrinsic spin of electrons. B) Polar and nonpolar nature of molecules. C) Pauli exclusion principle. D) Electronegative nature of materials. Show Answer Correct Answer: A) Atomic current and intrinsic spin of electrons. 38. Why does the compass needle move when a magnet is brought near? A) The magnet creates a magnetic field that interacts with the needle. B) The magnet is too heavy. C) The compass is broken. D) The needle is made of plastic. Show Answer Correct Answer: A) The magnet creates a magnetic field that interacts with the needle. 39. Which of the following is an example of diamagnetic substance? A) Nickel. B) Copper. C) Aluminum. D) Iron. Show Answer Correct Answer: C) Aluminum. 40. If a transformer increases voltage, it is called a ..... transformer. A) Step left. B) Step down. C) Step up. D) Step right. Show Answer Correct Answer: C) Step up. 41. What is the principle behind magnetic levitation? A) Magnetic levitation relies on thermal expansion to lift objects. B) Magnetic levitation is achieved through the use of electric currents only. C) Magnetic levitation works by creating a vacuum around the object. D) Magnetic levitation is based on the principle of magnetic forces counteracting gravity. Show Answer Correct Answer: D) Magnetic levitation is based on the principle of magnetic forces counteracting gravity. 42. Magnetism is generated by moving A) Electrons. B) Protons. C) Elements. D) Neutrons. Show Answer Correct Answer: A) Electrons. 43. For a magnet, the strength of the magnetic field: A) Zero at the poles. B) Maximum at the centre. C) Minimum at the poles. D) Maximum at the poles. Show Answer Correct Answer: D) Maximum at the poles. ← PreviousRelated QuizzesScience QuizzesClass 12 QuizzesClass 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 1Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 2Class 12 Physics (Part I) Chapter 5 Magnetism And Matter 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 4 Moving Charges And Magnetism QuizClass 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books