Important Questions for Class 11 Physics Chapter 10 Thermal Properties of Matter

Important Questions for Class 11 Physics Chapter 10: Chapter 10 of Class 11 Physics, Thermal Properties of Matter , deals with the concepts of heat, temperature, and the behavior of matter under thermal conditions. Key topics include the laws of thermodynamics, specific heat capacity, and calorimetry. The chapter explores how heat affects different substances, the concept of latent heat, and the mechanisms of heat transfer (conduction, convection, and radiation).

Important Questions for Class 11 Physics Chapter 10 Overview

Important Questions for Class 11 Physics Chapter 10 PDF

Important Questions for Class 11 Physics Chapter 10 PDF

Important Questions for Class 11 Physics Chapter 10 Thermal Properties of Matter

3 Mark Questions

4 Marks Questions

4.Explain why:

(a) a body with large reflectivity is a poor emitter

(b) a brass tumbler feels much colder than a wooden tray on a chilly day

(c) an optical pyrometer (for measuring high temperatures) calibrated for an ideal black body radiation gives too low a value for the temperature of a red hot iron piece in the open, but gives a correct value for the temperature when the same piece is in the furnace

(d) the earth without its atmosphere would be inhospitably cold

(e) heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water

Ans: (a) A body with a high reflectivity absorbs light radiations poorly. A poor radiation absorber will also be a poor radiation emitter. As a result, a body with a high reflectivity is an inefficient emitter.

(b) Brass is an excellent heat conductor. When a person touches a brass tumbler, heat is easily transferred from the body to the tumbler. As a result, the body's temperature drops to a lower level, and one feels cooler.

Wood is a poor heat conductor. When one touches a wooden tray, just a small amount of heat is transferred from the body to the tray. As a result, there is only a minor reduction in body temperature, and one does not feel cool. On a cool day, a metal tumbler seems colder than a wooden tray.

(c) The temperature of a red hot iron piece maintained in the open is measured incorrectly by an optical pyrometer calibrated for perfect black body radiation. The equation for black-body radiation is:

As a result, increasing the temperature of open space lowers the amount of energy radiated. When the same piece of iron is heated in a furnace, the amount of radiation energy produced is the same.

(d) Earth would be inhospitably cold without its atmosphere. There will be no additional heat trapped in the absence of air gases. The heat would be reflected back to the surface of the earth.

(e) A heating system that circulates steam rather than hot water is more efficient in warming a building. This is due to the fact that steam includes latent heat, which is surplus heat.

Benefits of Using Important Questions for Class 11 Physics Chapter 10

Focused Preparation : It helps students focus on the most frequently asked and important topics, ensuring efficient study time.

Better Understanding : By solving these questions, students can deepen their understanding of key concepts like heat transfer, specific heat, and thermodynamic processes.

Enhanced Problem-Solving Skills : Practicing important questions sharpens analytical and problem-solving abilities, crucial for both exams and practical applications.

Exam Readiness : It boosts confidence by familiarizing students with the exam pattern and types of questions likely to appear.

Self-Assessment : Students can evaluate their grasp of the subject and identify areas that need further attention.