Magnetic Effects of Electric Current — Science STD 10 — Question

Give any two differences between the properties of diamond and graphite. What causes these differences?

Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive.

1. Yellow seed.
2. Round seed.

What is meant by rainwater harvesting? Name some of the ancient structures used for rainwater harvesting by the rural people.

How does the valency of elements vary (i) in going down a group, and (ii) in going from left to right in a period of the periodic table?

When a person breathes in air, the air enters into his body through an organ Ahaving two holes B in it. The air then passes through pharynx and larynx and enters into a tube C. The tube C divides into two smaller tubes D at its lower end. The two smaller tubes are attached to two respiratory organs E. Each smaller tube divides inside the organs E to form a large number of still smaller tubes called F. The smallest tubes F have air-sacs G at their ends in which gaseous exchange takes place in the body of the person. What are A, B, C, D, E, F and G?

An object is placed at a distance of 6cm from a convex mirror of focal length 12cm. Find the position and nature of the image.

Name the various organs of the human excretory system.

State and explain the laws of refraction of light with the help of a labelled diagram.

Explain why, iron sheets are coated with zinc.

When a light ray passes obliquely through the atmosphere in an upward direction how does its path generally change?