Heat and Temperature Obj-2 HC Verma Solutions Vol-2 Chapter-23

Heat and Temperature Obj-2 HC Verma (MCQ-2) Solutions Vol-2 Chapter-23 Concept of Physics for Class-12. Step by Step Solutions of Objective -2 (MCQ-2) Questions of Chapter-23 Heat and Temperature (Concept of Physics) .Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

Heat and Temperature Obj-2 (MCQ-2) HC Verma Solutions Vol-2 Chapter-23 Concept of Physics

Board ISC and other board
Publications Bharti Bhawan Publishers
Chapter-23 Heat and Temperature
Class 12
Vol  2nd
writer HC Verma
Book Name Concept of Physics
Topics Solution of Objective-2 (MCQ-2) Questions
Page-Number 12

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Question for Short Answer


Objective-II (Currently Open)

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Heat and Temperature Obj-2 (MCQ-2) HC Verma

HC Verma Solutions of Ch-23  Vol-II Concept of Physics for Class-12


Question-1 :-

A spinning wheel is brought in contact with an identical wheel spinning at identical speed. The wheels slow down under the action of friction. Which of the following energies of the first wheel decreases?

(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal

Answer-1 :-

The options,  (a) and (c)  are correct


The kinetic energy of a body depends on its speed. Since when a spinning wheel is slowed down, its speed decreases leading to reduction in its kinetic energy. The mechanical energy of a body is defined as the sum of its potential and kinetic energies. Since the kinetic energy of the wheel has been decreased, it’ll lead to decrease in its mechanical energy. When the wheel slows down due to friction, its mechanical energy gets converted into heat energy, leading to increase in internal energy, which increases with increase in temperature.

Question-2 :-

A spinning wheel A is brought in contact with another wheel B, initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which of the following energies of the wheel B increases?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal

Answer-2 :-

The all options,  (a), (b), (c) and (d) are correct


When the wheel B starts spinning because of the friction at contact, it will gain kinetic energy and, hence, mechanical energy (kinetic + potential energies). Also, internal energy will increase, which increases with rise in temperature. Along with it, the generation of heat energy due to friction will lead to increase in the net sum of all the energies, i.e. total energy.

Question-3 :-

A body A is placed on a railway platform and an identical body B in a moving train. Which of the following energies of B are greater than those of A, as seen from the ground?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal

Answer-3 :-

The options,  (a), (b), and (c)  are correct


As body A is at rest on the ground, it possesses only potential energy, whereas body B, being placed inside a moving train, possesses kinetic energy due to its motion along with the train. Therefore, body B will have greater kinetic, mechanical (energy possessed by the body by virtue of its position and motion = kinetic energy+potential energy) energy and, hence, total (sum of all the energies) energy. No information is given about the temperature of the body so we can not say whether body B s internal energy will be or will not be greater than that of body A.

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