Carbon and its Compounds — Science STD 10 — Question

Mention two uses of ethanoic acid.

What is meant by breathing? What happens to the rate of breathing during vigorous exercise and why?

Explain with the help of a diagram, why the convex lens is also called a converging lens.

Calculate the ratio of the equivalent resistance of the above two wires in parallel combination to that in series combination.

State the importance of chromosomal difference between sperms and eggs of humans.

How do Mendel’s experiments show that traits may be dominant or recessive?

Arrange the terms in correct sequence:
Glomerulus, renal vein, efferent arterioles, renal artery, afferent arterioles, secondary capillaries.

Non-metals do not evolve hydrogen gas when react with water, steam or dilute acids. Why?

Graphite is a covalent molecule but a good conductor of electricity. Why?

State reasons for the following observations:
Metal sulphides occur mainly in rocks but metal halides occur mostly in sea and lake waters.