A glass full of hot milk is poured on the table. It begins to cool gradually. Which of the following is correct?
(a) The rate of cooling is constant till milk attains the temperature of the surrounding
(b) The temperature of milk falls off exponentially with time
(c) While cooling, there is a flow of heat from milk to the surrounding as well as from surrounding to the milk but the net flow of heat is from milk to the surrounding and that is why it cools
(d) All three phenomenon, conduction, convection and radiation are responsible for the loss of heat from milk to the surroundings
A glass full of hot milk is poured on the table. It begins to cool gradually. Which of the following is correct?
(a) The rate of cooling is constant till milk attains the temperature of the surrounding
(b) The temperature of milk falls off exponentially with time
(c) While cooling, there is a flow of heat from milk to the surrounding as well as from surrounding to the milk but the net flow of heat is from milk to the surrounding and that is why it cools
(d) All three phenomenon, conduction, convection and radiation are responsible for the loss of heat from milk to the surroundings
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1 Answer
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This is a multiple choice answer as classified in NCERT Exemplar
(b), (c), (d) When the hot milk in the table is transferred to the surroundings by conduction, convection and radiation.
According to newton's law of cooling temperature of the milk falls of exponentially. Heat also will be transferred from surroundings to the milk but will be lesser than that of transferred from milk to surroundings. So option b, c, d satisfy.
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This is a multiple choice answer as classified in NCERT Exemplar
(a), (d) During the process AB temperature of the system is 00C . hence it represents phase change that is transformation of ice into water while temperature remains 00C.
BC represents rise in temperature of water from 00C to 1000C. now water starts converting into steam which is represented by CD.
Which is only represents by a, d options
This is a multiple choice answer as classified in NCERT Exemplar
(b), (c) Smaller gulab jamun having least surface area hence they will be heated first. As in case of smaller gulab jamun heat radiates will be less.
Similarly smaller pizzas are heated before bigger ones because of smaller surface area.
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