11: Calorimetry : Icse-x-physics

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Qstn #1
Define the term heat.
Ans : 1 The kinetic energy due to random motion of the molecules of a substance is known as its heat energy.

Qstn #2
Name the S.I. unit of heat.
Ans : 2 S.I. unit of heat is joule (symbol J).

Qstn #3
Define the term calorie. How is it related to joule?
Ans : 3 One calorie of heat is the heat energy required to raise the temperature of 1 g of water from 14.5°C to 15.5 °C.
1 calorie = 4.186 J

Qstn #4
Define one kilo-calorie of heat.
Ans : 4 One kilo-calorie of heat is the heat energy required to raise the temperature of 1 kg of water from 14.5°C to 15.5°C.

Qstn #5
Define temperature and name its S.I. unit.
Ans : 5 The quantity which determines the direction of flow of heat between two bodies kept in contact is called temperature.
S.I. unit kelvin (K).

Differentiate between heat and temperature.

Ans : 6

Heat	Temperature
The kinetic energy due to random motion of the molecules of a substance is known as its heat energy.	The quantity which determines the direction of flow of heat between two bodies kept in contact is called temperature.
S.I. unit joule (J).	S.I. unit kelvin (K)
It is measured by the principle of calorimetry.	It is measured by a thermometer.

Qstn #7
Define calorimetry
Ans : 7 The measurement of the quantity of heat is called calorimetry.

Qstn #8
Define the term heat capacity and state its S.I. unit.
Ans : 8 The heat capacity of a body is the amount of heat energy required to raise its temperature by 1°C or 1K.
S.I. unit is joule per kelvin (JK^-1).

Qstn #9
Define the term specific heat capacity and state its S.I. unit.
Ans : 9 The specific heat capacity of a substance is the amount of heat energy required to raise the temperature of unit mass of that substance through by 1°C (or 1K). S.I. unit is joule per kilogram per kelvin (Jkg^-1K^-1).

Qstn #10
How is heat capacity of a body related to specific heat capacity of its substance?
Ans : 10 Heat capacity = Mass x specific heat capacity

Qstn #11
Differentiate between heat capacity and specific heat capacity.
Ans : 11 Heat capacity of the body is the amount of heat required to raise the temperature of (whole) body by 1°C whereas specific heat capacity is the amount of heat required to raise the temperature of unit mass of the body by 1°C.
Heat capacity of a substance depends upon the material and mass of the body. Specific heat capacity of a substance does not depend on the mass of the body.
S.I. unit of heat capacity is JK and S.I. unit of specific heat capacity is Jkg^-1K^-1

Qstn #12
Name a liquid which has the highest specific heat capacity.
Ans : 12 Water has the highest specific heat capacity.

Qstn #13
Write the approximate value of specific heat capacity of water in S.I. unit.
Ans : 13 Specific heat capacity of water = 4200 J kg^-1K^-1