Questions

Black  surfaces are good emitters of heat ( They are also good absorbers of heat). If the black surface is rough too, the emitting will be better. So (b) is the correct answer. Shining surfaces reflect back radiation. So if the black surface is also shining the effectiveness of emitting heat is lessened.

According to the Mercer’s 19th annual Quality of Living survey released Hyderabad emerged as the best city in terms of living standards among Indian cities for the third year in a row.

Photography is a word derived from Greek words Photo means light and graphe means drawing.'Hence it literally means light drawing.

G.V. Iyer

SI Bhyrappa

The main purpose of balancing chemical equations is to make the mass of reactants is equal to mass of products obtained after the reaction. Hence, to make law of conservation of mass is purpose of balancing chemica equations.