Calorimetry HC Verma Solutions of Que for Short Ans Ch-25 Vol-2

Calorimetry HC Verma Solutions of Que for Short Ans Vol-2 Ch-25 Concept of Physics. Step by Step Solution of Questions for short answer of Ch-25 Calorimetry HC Verma Question of Bharti Bhawan Publishers . Visit official Website CISCE for detail information about ISC Board Class-12 Physics.

Calorimetry HC Verma Solutions of Que for Short Ans Ch-25 Vol-2

Board ISC and other board
Publications Bharti Bhawan Publishers
Ch-25 Calorimetry 
Class 12
Vol  2nd
writer H C Verma
Book Name Concept of Physics
Topics Solutions of Question for Short Answer
Page-Number 46

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Ques for Short Ans

Objective-I

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Exercise


Calorimetry Que for Short Ans

HC Verma Solutions of Ch-25  Vol-2 Concept of Physics for Class-12

(Page-46)

Question 1 :-

Is heat a conserved quantity?

Answer 1 :-

Yes, heat is a conserved quantity. Suppose two bodies A and B are at different temperatures, wherein A is higher and B is lower. When they are brought in contact, the heat given by A is equal to the heat gained by B. Thus, the heat is conserved in the system.

Here, we have ignored the heat exchanged with the surroundings. If we consider the surroundings, the heat of the system will be conserved.

Question 2 :-

The calorie is defined as 1 cal = 4.186 joule. Why not as 1 cal = 4 J to make the conversions easy?

Answer 2 :-

One calorie is defined as the heat required to raise the temperature of 1 g of water from 14.5o C to 15.5o C. Also, exactly 4.186 J of work is to be done on heating 1 g of water from 14.5o C to 15.5o C. So, we cannot round-off 4.186 J to 4 J as it will give significant difference in work done required to raise the temperature and heat required to raise the temperature.

Since work and heat are equivalent here, so on taking 1 calorie = 4 J, the validity of the equivalence of work and heat will get defied. Thus, just to make conversion easy, 1 calorie cannot be taken equal to 4 J.

Question 3 :-  (Calorimetry HC Verma Solutions )

A calorimeter is kept in a wooden box to insulate it thermally from the surroundings. Why is it necessary?

Answer 3 :-

A calorimeter is kept in a wooden box to insulate it thermally from the surroundings because in order to determine the specific heat capacity, the total heat transferred must be known. Heat must not be exchanged with the surroundings, otherwise the principle of calorimeter would not stand valid.

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