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THERMAL PROPERTIES OF MATTER QUIZ-5

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JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q41. The molar heat capacity of a certain substance varies with temperature according to the given equation C=27.2+(4×10(-3) )T The heat necessary to change the temperature of 2 mol of the substance from 300 K to 700 K is
  •  3.46×104 J
  •  2.33×103 J
  •  3.46×103 J
  •  2.33×104 J
Solution


42. An iron rod of length 50 cm is joined at an end to an aluminium rod of length 100 cm. All measurements refer to 20°C. The coefficients of linear expansion of iron and aluminium are 12×10^(-6)/°C and 24×10^(-6)/°C, respectively. The average coefficient of composite system is
  •  36×10(-6)/°C
  •  12×10(-6)/°C
  •  20×10(-6)/°C
  •  48×10(-6)/°C
Solution


Q43. Two rods of same length and material transfer a given amount of heat in 12 s, when they are joined end to end. But when they are joined lengthwise, they will transfer same heat in same conditions in
  •   24 s
  •  3 s
  •  1.5 s
  •  48 s
Solution

Q44. A black body at 200 K is found to emit maximum energy at a wavelength of 14 μm. When its temperature is raised to 1000 K, the wavelength at which maximum energy is emitted is
  •  14 μm
  •  70 μm
  •  2.8 μm
  •  -2.8 μm
Solution


Q45. A cup of tea cools from 80°C in 1 min. The ambient temperature is 30°C. In cooling from 60°C to 50°C it will take
  •  30 s
  •  60 s
  •  90 s
  •  48 s
Solution
 


Q46. Heat is required to change 1 kg of ice at -20°C into steam. Q_1is the heat needed to warm then ice from -20°C to 0°C,Q_2 is the heat needed to melt the ice, Q_3 is the heat needed to warm the water from 0°C to 100℃ and Q_4 is the heat needed to vapourize the water. Then
  •  Q_4>Q_3>Q_2>Q_1
  •  Q_4>Q_3>Q_1>Q_2
  • Q_4>Q_2>Q_3>Q_1
  •  Q_4>Q_2>Q_1>Q_3
Solution


Q47. The coefficient of linear expansion expansion of crystal in one direction is α_1 and that in every direction perpendicular to it is α_2. The coefficient of cubical expansion is
  •  α_1+α_2
  •  2α_1+α_2
  •  α_1+2α_2
  •  None of these
Solution


Q48. Water of volume 2 L in a container is heated with a coil of 1 kW at 27℃ . The lid of the container is open and energy dissipates at rate of 160 Js(-1). In how much time temperature will rise from 27℃ to 77℃ [Given specific heat of water is 4.2 kJ kg(-1)]
  •  8 min 20 s
  •  6 min 2 s
  •  7 min
  •  14 min
Solution


Q49. The coefficient of apparent expansion of a liquid in a copper vessel is C and in a silver vessel S. The coefficient of volume expansion of copper is γ_c. What is the coefficient of linear expansion of silver
  •  (C+γ_C+S)/3
  •  (C-γ_C+S)/3
  •  (C+γ_C-S)/3
  •  (C-γ_C-S)/3
Solution


Q50. Certain substance emits only the wavelengths λ_1,λ_2,λ_3 and λ_4 when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelength
  •  λ_1
  •  λ_2
  •  λ_1and λ_2/span>
  • λ_1and λ_2
Solution

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