## THERMAL PROPERTIES OF MATTER QUIZ-2

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.

Q11. 2 kg of ice at -20℃ is mixed with 5 kg of water at 20℃ in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg/℃ and 0.5 kcal/kg/℃ while the latent heat of fusion of ice is 80 kcal kg(-1)
•  7 kg
•  6 kg
•  4 kg
•  2 kg
Solution

Q12. A ball of thermal capacity 10 cal/°C is heated to the temperature of furnace. It is then transferred into a vessel containing water. The water equivalent of vessel and the contents is 200 g. The temperature of the vessel and its contents rises from 10°C to 40°C. What is the temperature of furnace?
•  640°C
•  64°C
•  600°C
•  100°C
• Solution

Q13. Two liquids A and B are at 32°C and 24°C. When mixed in equal masses the temperature of the mixture is found to be 28°C. Their specific heats are in the ratio of
•   3:2
•  2:3
•  1:1
•  4:3
Solution

Q14. A system receives heat continuously at the rate of 10 W. The temperature of the system becomes constant at 70°C when the temperature of the surroundings is 30°C. After the heater is switched off, the system cools from 50℃ to 49.9°C in 1 min. The heat capacity of the system is
•  1000 J/°C
•  1500 J/°C
•  3000 J/°C
•  None of these
Solution

Q15. Water at 0°C, contained in a closed vessel, is abruptly opened in an evacuated chamber. If the specific latent heats of fusion and vapourization at 0°C are in the ratio Î»:1, the fraction of water evaporated will be
•  Î»/1
•  Î»/(Î»+1)
•  (1-Î»)/Î»
•  (Î»-1)/(Î»+1)
Solution

Q16. The rectangular surface of area 8 cm × 4 cm of a black body at a temperature of 127°C emits energy at the rate of E per second. If the length and breadth of the surface are each reduced to half of the initial value and the temperature is raised to 327°C, the rate of emission of energy will become
•  3/8 E
•  81/16 E
• 9/16 E
•  81/64 E
Solution

Q17. A piece of ice (heat capacity=2100JKg(-1)(-1) and latent heat=〖3.36×10〗5 Jkg(-1)) of mass m gram is at -5℃ at atmospheric pressure. It is given 420 J of heat so that the ice starts melting. Finally when the ice-water mixture is in equilibrium, it is found that 1 g of ice has melted. Assuming there is no other heat exchange in the process, the value of m is
•  8
•  6
•  4
•  8.5
Solution

Q18. An aluminium measuring rod, which is correct at 5℃ measures the length of a line as 80 cm at 45° C. If thermal coefficient of linear expansion of aluminium is 2.50×10(-5)/°C, the correct length of the line is:
•  80.08 cm
•  79.92 cm
•  81.12 cm
•  79.62 cm
Solution

Q19. When the temperature of a black body increases, it is observed that the wavelength corresponding to maximum energy changes from 0.26 Î¼m to 0.13 Î¼m. The ratio of the emissive powers of the body at the respective temperatures is
•  16/1
•  4/1
•  1/4
•  1/16
Solution

Q20. A piece of metal weighs 46 g in air. When immersed in a liquid of specific gravity 1.24 at 27°C it weights 30 g. When the temperature of liquid is raised to 42°C the metal piece weight 30.5 g. Specific gravity of liquid at 42° C is 1.20. Calculate the coefficient of linear expansion of metal:
•  2.23×10(-5)/°C
•  6.7×10(-5)/°C
•  4.46×10(-5)/°C
• None of these
Solution

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Thermal Properties of Matter-Quiz-2