PART - 2 CH - 10 Thermal Properties of Matter — Physics STD 11 Science — Question

Write Joule's law.

Why strain has no units?

Write two characteristics of a medium which determine the speed of sound waves in the medium.

What is the range of inter-molecular forces?

A body of mass 2kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1. Compute the: Work done by the net force on the body in 10s.

Read statement below carefully, and state, with reasons, if it is true or false: The instantaneous acceleration of the point of contact during rolling is zero.

Two light sources of intensities 8cd and 12cd are placed on the same side of a photometer screen at a distance of 40cm from it. Where should a 80cd source be placed to balance the illuminance?

Why can an engine working under isothermal conditions produce no useful work?

Textbooks on science may give you a wrong impression that studying science is dry and all too serious and that scientists are absent-minded introverts who never laugh or grin. This image of science and scientists is patently false. Scientists, like any other group of humans, have their share of humorists, and many have led their lives with a great sense of fun and adventure, even as they seriously pursued their scientific work. Two great physicists of this genre are Gamow and Feynman. You will enjoy reading their books listed in the Bibliography.

Is it possible to boil water at room temperature, say 30°C? If we touch a flask containing water boiling at this temperature, will it be hot?