PART - 3 CH - 9 Light-Reflection and Eefraction — Science STD 10 — Question

Write the Joule's law of heating. State the factors on which heat generated in a conductor due to electric current depends.

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

Why should a magnesium ribbon be cleaned before burning in air?

What would be the consequences of a deficiency of haemoglobin in our bodies?

What is caused by damage or malfunction of any part of our visual system ?

At one of the blind ends of a road in a colony, lot of accidents used to take place. One day, Shalini moved into a house near the blind end. On a certain day, she saw an accident taking place at the blind end.
She, at once rushed to the spot and helped the victims with the first-aid. She then telephoned for an ambulance. Later on she met the president of the welfare committee of the colony and requested him to install huge convex mirrors at both the ends of the blind end. After the installation of the mirrors the accident rate suddenly dropped.
(1) Why did Shalini advise the installation of huge convex mirrors at both ends of the blind end?
(2) What according to you are the values displayed by Shalini?
(3) What according to you are the values displayed by president of the welfare committee of the colony?

How is oxygen and carbon dioxide transported in human beings?

What are the problems caused by the non-biodegradable wastes that we generate?

Name the three types of wires used in household circuits with their respective colours of insulation.