Structure of the Atom — Science STD 9 — Question

Identify the following fishes:

1. Fish with 5 to 7 pairs of gills.
2. Fish with air bladder.

What happens to the passengers travelling in a bus when the bus takes a sharp turn? Give reasons for your answer.

What is the main function of each of the following organelles?

1. Ribosome.
2. Cell wall.

What is the importance of tissues?

Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.

Name the following:

1. Organism in which external ear (pinna) is present.
2. Organism in which nictitating membrane is present.

What is a physical change? Give two examples of physical changes.

State any three changes that a force brings about on a body with one example each.

How much water should be mixed with 12ml of alcohol so as to obtain 12% alcohol solution?

The values of g at six distances A, B, C, D, E and F from the surface of the earth are found to be 3.08m/s², 9.2.3m/s², 0.57m/s², 7.34m/s², 0.30m/s² and 1.49m/s², respectively.

1. Arrange these values of g according to the increasing distances from the surface of the earth (keeping the value of g nearest to the surface of the earth first).
2. If the value of distance F be 10000km from the surface of the earth, state whether this distance is deep inside the earth or high up in the sky. Give reason for your answer.