Case Study Questions for Class 11 Physics Chapter 11 Thermal Properties of Matter
Case Study Questions:
Question 1:
Specific Heat Capacity
Heat capacity of a substance is defined as
where ΔQ is the amount of heat supplied to the substance to change its temperature from T to T + ΔT.
Specific heat capacity is the amount of heat per unit mass absorbed or given off to change its temperature by one unit.
It depends on the nature of substance and its temperature.
1. Which one of the following substances has highest specific heat capacity at room temperature and atmospheric pressure?
(a) Water
(b) Ice
(c) Aluminium
(d) Mercury
2. Heat capacity of a substance is infinite. It means
(a) heat is given out.
(b) heat is taken in.
(c) no change in temperature whether heat is taken in or given out.
(d) all of these.
3. Water is used as a coolant because
(a) it has lower density.
(b) it has low specific heat.
(c) it has high specific heat.
(d) it is easily available.
4. Calorie is defined as the amount of heat required to raise the temperature of 1 g of water by 1°C and it is defined under which of the following conditions?
(a) From 14.5°C to 15.5°C at 760 mm of Hg
(b) From 98.5°C to 99.5°C at 760 mm of Hg
(c) From 13.5°C to 14.5°C at 76 mm of Hg
(d) From 3.5°C to 4.5°C at 76 mm of Hg
5. Find the thermal capacity of 40 g of aluminum. (s = 0.2 cal/g K)
(a) 168 J/°C
(b) 672 J/°C
(c) 840 J/°C
(d) 33.6 J/°C
Answer
➤ Show Answer
Answer:1. (a)
2. (c) : Infinite thermal capacity implies that there would be practically no change in temperature whether heat is taken in or given out.
3. (c) : Owing to its high specific heat, water is used as a coolant in automobile radiators as well as a heater in hot water bags.
4. (a) : 1 calorie is the amount of heat required to raise the temperature of 1 g of water from 14.5°C to 15.5°C at 760 mm of Hg.
5. (d)
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