English Medium Class 9 - CBSE Question Bank Solutions for Science

Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?

Why does our palm feel cold when we put some acetone (or perfume) on it ?

How will you demonstrate that water vapour is present in air ?

How can the evaporation of a liquid be made faster ?

What is evaporation ? State the various  factors which affect evaporation.

Why does evaporation cool a liquid ?

Which of the following are also considered to be the states of matter ?

1. Plasma
2. Platelets
3. BEC
4. BHC

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :

The evaporation of water increases under the following conditions :

Give four important functions of epithelial tissue. Name one specific place in the body where each function is carried out.

List One Function of the Following : 3.Goblet Cell

The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.

1. Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
2. Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
3. Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
4. Name the most common substance belonging to state A.
5. Which state of matter makes the sun and other stars to glow ?

Name the Following : (B) Epithelium Which Lines Lung Alveoli.

Describe the structure and functions of epithelium.

What is difference between bilateral symmetry and radial symmetry?

Write down four characteristics of Ctenophora and give two examples.

Write down four main characters of Platyhelminthes. Give two examples.

Main characteristics of Nematoda:

Write down four main characters of Annelida.

Define the term hermaphrodite. Give two examples.