Name the mode of heat transfer in each of the following cases :following cases:
(a) In a vessel of boiling water.
(b) Heat energy teaching us from the sun.
(c) A vessel kept on a hot stove becomes hot.
(d) Warm breeze from the land flows towards the sea.
(e) A spoon kept in a hot tea cup becomes warm.

What are the signs of DeltaS for the system and for the surrounding in each of the following processes? (a) Water boils in a teakettle on a hot stove. (b) Ice in an ice cube tray, left an a table melts. (c) A cup of coffee is reheated in a microwave oven.

In which of the following process, convection does not take place primarily? (a) Sea and land breeze (b)Boiling of water (c) Warming of glass of bulb due ot filament (d) Heating air around a furnace

Which of the following conditions lead to the blowing of sea-breeze in coastal areas ? A. Land cool and sea warm B. Land hot and sea cool C. Day time D. Night time

Imran and Rohan are best friends. They study in different schools in Srianagar in Kashmir. Imran has just entered class IX whereas Rohan is a student of class X. This year, winter is very severe in Kashmir, So, imran Rohan were discussing the central heating systens, which could be used to heat their homes during severe cold in this winter season. Imran said that they can use boiling hot water in hot water radiators for the central heating of their homes in water. Rohan, however, did not agree with Imran. Rohan said that he, however, does not know the practical implications of his recommendation. (a) What is the temperature of boiling water under normal conditions ? (b) What is the temperature of steam formed from boiling water under normal conditions ? (c) Out of boiling water and steam, which causes more severe burns on the skin and why ? (d) State whether boiling water or steam is better for central heating in homes during extreme water. Give your choice. (f) What values are displayed by Rohan in this episode ?

Name the process associated with the following (a) Dry ice is kept at room temperature and at one atmospheric pressure. (b) A drop of link placed on the surface of water contained in a glass spreads throughout the water. (c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring. (d) A acetone bottle is left open and the bottle becomes empty. (e) Milk is churned to separate cream from it. (f) Settling of sand when a mixture of sand and water is left undisturbed for some time. (g) Fine beam of light entering through a small hole in a dark room. Illuminates the particles in its paths.