Calorimetry Class-10 Goyal Brothers ICSE Physics Solutions Ch-4

Calorimetry Class-10 Goyal Brothers  ICSE Physics Solutions Chapter-4 Calorimetry . We Provide Step by Step Answer of Exercise, MCQs, Numericals Practice Problem Questions of Exercise-1 Calorimetry ICSE Class-10 . Visit official Website CISCE  for detail information about ICSE Board Class-10 Physics.

Calorimetry Class-10 Goyal Brothers ICSE Physics Solutions Ch-4


-: Select Topics :-

Exercise-1

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 MCQ -1

Numericals Practice Problems-1

Exercise-2

 MCQ -2

Numericals Practice Problems-2

 


Exe-1 Calorimetry Class-10 Goyal Brothers ICSE Physics Solutions Ch-4

Page-54,55

Question 1.
Define calorie.
Answer 1:
CALORIE : “Is the amount of heat energy required to raise the temperature of 1 g of water from 14.5 °C to 15.5°C”.

Question 2.
State the modern unit of heat energy. How is this unit related to calorie ?
Answer 2:
Modern unit of heat energy is joule
Relation of joule with calorie :
1 J = 2.4 calorie
or 1 calorie = 4 .186 J = 4.2 J (approx)

Question 3.
What do you understand by the term thermal capacity ? State its unit is SI system.
Answer 3:
Thermal capacity : “The amount of heat energy required to raise the temperature of a given mass of substance through 1°C (1k) is called thermal capacity”.

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Question 4.
Define specific heat capacity and state its SI and CGS units.
Answer 4:
Specific heat capacity : “Is the amount of heat energy required to raise the temperature of unit mass of a substance through 1°C or 1K is called specific heat capacity.”
A New Approach to ICSE Physics Part 2 Class 10 Solutions Calorimetry 3

Question 5.
Is the specific heat capacity of ice greater, equal to or less than water ?
Answer 5:
Specific heat capacity of ice is less than specific heat capacity of water.

Question 6.
Explain the following :

(a) Water is used in hot water bottles for fomentation purposes.
Answer 6:
Water provides heat energy for longer time and does not cool quickly as specific heat capacity of water is large.

(b) Water is used as a coolant in motor car radiators.
Answer:
When water is circulated in the pipes, it absorbs more amount of heat from surroundings (removes heat) without much rise in its temperature because of its high specific heat capacity.

(c) A wise farmer always waters his fields in the evening, if there is a forecast for frost.
Answer:
To save the crops on such cold nights farmers fill their fields with water as water has high sp. heat capacity. So water does not allow the temp, in the surrounding area of plants to fall upto 0°C. Other wise when temp, falls below 0°C water in the fine capillaries of plants will freeze, so the veins will burst due to increase in volume of water on freezing.

(d) Wet soil does not get as hot as dry soil in the sun.
Answer:
Water has high sp. heat capacity as compared to soil (dry) and absorbs heat from surrounding for longer time and takes longer time to set as compared to dry soil.

(e) Water is sprinkled on the roads in the evening during hot summer.
Answer:
Water has high sp. heat capacity and removes heat from the hot soil and decreases its temperature during hot summer evening.

(f) Water is used for internal heating in cold countries.
Answer:
In cold countries water is used for internal heating as it can carry large amount of heat energy from the furnace to the rooms at a fairly moderate temperature.

(g) Cold water is poured on the burns caused on the skin by some hot object.
Answer:
Water has high sp. heat capacity and can remove more heat from the bums caused on the skin by hot object and releives of the pain.

(h) Water rubs are kept in warehouses storing fruits and vegetables in cold countries during winter.
Answer:
Water has high sp. heat capacity and water kept in tubs lose heat for a longer time and keep the surrounding hot for longer time and save the vegetables from busting due to increase in volume at low temp, of water present vegetables.

Question 7.
Explain how is land breeze caused ?
Answer 7:
Land breeze : Blowing of cold air from land towards sea. During night temp, of land falls more rapidly as compared to water. Since water has high sp. heat capacity Pressure over sea water decrease and hence air blows from land (high pressure) towards sea (low pressure)

Question 8.
Explain the formation of sea breeze.
Answer 8:
Sea breeze : Blowing of cool air from sea towards land. During day time land gets heated up rapidly due to low sp. heat of land as compared to water. Pressure at land decreases. Hence air blows from sea (high pressure) towards land (low pressure).

Question 9.
Why is the weather in coastal regions moderate ?
Answer 9:
The climate near coastal regions moderate : The sp. heat capacity of water is very high or sp. heat capacity of land is much low as compared to water. As such land (or sand) gets cooled more rapidly as compared to water under similar conditions. Thus, a large difference in temperature is developed between the land and the sea, due to which cold air blows from land towards sea during night (i.e. land breeze) and during the day cold air blows from sea towards land (i.e. sand breeze). These make the climate near coastal region moderate.


 Multiple Choice Questions-1

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Calorimetry Class-10 Goyal Brothers  ICSE Physics Solutions

1. The specific heat capacity of a substance :
(a) changes with the mass of given substance.
(b) changes with the area or volume of substance.
(c) changes with rise or fall in temperature.
(d) is a constant quantity for a given substance.
Answer:
(d) is a constant quantity for a given substance.

2. Land and sea breezes are formed in coastal regions because :
(a) water has very high specific heat capacity than the land.
(b) land has very high specific heat capacity than the water.
(c) sea water cools the cooler regions. .
(d) all the above.
Answer:
(a) water has very high specific heat capacity than the land.

3. The base of cooking pans is made thicker and heavy because:
(a) it lowers the heat capacity of pan
(b) it increases the heat capacity of pan
(c) the food does not get charred and keeps hot for long time
(d) both (a) and (c)
Answer:
(d) both (a) and (c)

4. The S.I. unit of specific heat capacity is :
(a) JKg-1
(b) JK-1
(c) JKg-1 K-1
(d) kJkg-1 K-1
Answer:
(b) Jk-1

5. The specific heat capacity of water in S.I. system is :
(a) 4.2 Jkg-1 K-1
(b) 42 JKg-1 K-1
(c) 4200 JKg-1 k-1
(d) 420 JKg-1 K-1
Answer:
(c) 4200 JKg-1 K-1

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