51. The heat required to change a liquid into a gas at its boiling point is called latent heat of
Answer: D. vaporisation
Physics Class 10 Unit 11: Thermal Expansion and Change of State MCQs
67 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 2 of 2.
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52. The formula for heat required for a change of state (melting) is
Answer: B. ΔQ = mLf
53. The latent heat of fusion of ice is
Answer: C. 3.33×105 J kg-1
54. The latent heat of vaporisation of water is
Answer: A. 2.26×106 J kg-1
55. During melting of ice at 0 °C, the heat absorbed is used to
Answer: D. weaken the attractive forces between particles
56. On the temperature-heat graph of ice, the flat portion at 0 °C represents
Answer: B. latent heat of fusion
57. On the temperature-heat graph of water, the flat portion at 100 °C represents
Answer: C. latent heat of vaporisation
58. How much heat is required to change 15 kg of ice into water at its melting point (Lf = 3.3×105 J kg-1)?
Answer: A. 4.95×106 J
59. How much heat is required to change 7 kg of water into steam at its boiling point (Lv = 2.26×106 J kg-1)?
Answer: D. 1.58×107 J
60. If the latent heat of fusion of a material is 336 J/g, the heat required to melt 10 g of it at its melting point is
Answer: B. 3360 J
61. When the temperature of a gas in a fixed volume increases, its pressure
Answer: D. increases
62. When the volume of a gas is decreased at constant temperature, its pressure
Answer: A. increases
63. The pressure of a gas is inversely proportional to its volume at constant temperature according to
Answer: B. Boyle's law
64. Superconductors are materials through which current flows
Answer: C. without resistance
65. The temperature at and below which resistivity becomes zero is called the
Answer: D. critical temperature
66. Superconductivity was discovered in 1911 by
Answer: B. Heike Kamerlingh Onnes
67. The critical temperature of aluminium is
Answer: C. 1.18 K
About Physics Class 10 Unit 11 MCQs (Federal Board)
These 67 Physics MCQs cover Class 10 Unit 11: Thermal Expansion and Change of State of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 2 pages of 50. You can also read the Thermal Expansion and Change of State notes for this chapter. Download the Thermal Expansion and Change of State MCQs as a PDF using the button at the top of this page.