Calorimetry Obj-2 HC Verma Solutions Ch-25 Class-12 Vol-2

Calorimetry Obj-2 HC Verma Solutions Ch-25 Class-12 Vol-2 Concept of Physics for Class-12. Step by Step Solutions of Objective -2 (MCQ-2) Questions of Chapter-25 Calorimetry (Concept of Physics) .Visit official Website CISCE for detail information about ISC Board Class-12 Physics.

Calorimetry Obj-2 (MCQ-2) HC Verma Solutions Ch-25 Vol-2 Concept of Physics for Class-12

Board ISC and other board
Publications Bharti Bhawan Publishers
Chapter-25 Calorimetry 
Class 12
Vol 2nd
writer HC Verma
Book Name Concept of Physics
Topics Solution of Objective-2 (MCQ-2) Questions
Page-Number 46

-: Select Topics :-

Question for Short Answer

Objective-I

Objective-II

Exercise


Calorimetry Obj-2 (MCQ-2)

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

(Page-46)

Question-1 :-

The heat capacity of a body depends on

(a) the heat given

(b) the temperature raised

(c) the mass of the body

(d) the material of the body

Answer-1 :-

The options (c) and (d) are correct

Explanation:

The bigger the body, the larger is its capacity to absorb heat. Therefore, the heat capacity of a body depends on the mass of the body. Also, different bodies have different heat capacities due to their material properties, i.e. due to their molecular structure, the heat capacity of a body depends on the material of the body.

Here,

M = Molar mass related to number of moles

m = Mass

As the value of M is different for different bodies of different composition, the ratio cannot be a universal constant.

Also, the ratio is independent of the mass of the body.
The ratio of the specific heat and molar heat capacity depends on the molecular weight of the body.

Clearly, the unit of molecular weight is kg/mole. So, the ratio that depends only on the molecular weight cannot be dimensionless.

Question-3 :-

If heat is supplied to a solid, its temperature

(a) must increase

(b) may increase

(c) may remain constant

(d) may decrease

Answer-3 :-

The options (b) and (c) are correct

Explanation:

When heat is supplied to a solid, it is used up either to increase the temperature of the body or to change its state from one form to another by breaking the bonds between the molecules (without raising the temperature).

When heat is supplied to the solid, the internal energy of the solid increases, so the temperature does not decrease.

Question-4 :-

The temperature of a solid object is observed to be constant during a period. In this period

(a) heat may have been supplied to the body

(b) heat may have been extracted from the body

(c) no heat is supplied to the body

(d) no heat is extracted from the body

Answer-4 :-

The options (a) and (b) are correct

Explanation:

If there is no temperature change in a solid object, there is a possibility that the heat might have been supplied to the body that was used up in breaking the bond of the molecules, changing the state of the solid. This is why the temperature of the solid remains constant. Similar is the case when the heat is extracted from the body to change its state.

Since there is a possibility of supplying or extracting heat from the solid, we cannot say that heat is not supplied to the solid or is not extracted from the solid.

Question-5 :-

The temperature of an object is observed to rise in a period. In this period

(a) heat is certainly supplied to it

(b) heat is certainly not supplied to it

(c) heat may have been supplied to it

(d) work may have been done on it

Answer-5 :-

The options (c) and (d) are correct

Explanation:

If the temperature of an object rises in a period, then there are two possibilities. The heat may have been supplied to it, leading to an increase of the internal energy of the object. That will increase the temperature of the body.

The second possibility is that some work may have been done on it, again leading to an increase of the internal energy of the body. That will also increase the temperature of the body.

Question-6 :-

Heat and work are equivalent. This means,

(a) when we supply heat to a body we do work on it

(b) when we do work on a body we supply heat to it

(c) the temperature of a body can be increased by doing work on it

(d) a body kept at rest may be set into motion along a line by supplying heat to it

Answer-6 :-

The option (c) is correct

Explanation:

According to the statement “heat and work are equivalent”, heat supplied to the body increases its temperature. Similarly, work done on the body also increases its temperature.

For example: If work is done on rubbing the hands against each other, the temperature of the hands increases. So, we can say that heat and work are equivalent.

When heat is supplied to a body, we do not do work on it. When we are doing work on a body, it does not mean we are supplying heat to the body. Also, a body at rest cannot be set in motion along a line by supplying heat to it. So, these statements do not justify the equivalence of heat and work.

—: End of Calorimetry Obj-2 (mcq-2) HC Verma Solutions Vol-2 Chapter-25 :–


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