Here is a model question paper for class 9 science unit test.

Time: 1 Hour

Total marks: 25

Physics (9 marks)

1. Under what conditions is the magnitude of average velocity of an object equal to its average speed? (1 mark)

2. What is acceleration? What is its SI unit? (1 mark)

3. Distinguish between speed and velocity. (2 marks)

4. An athlete completes one round of a circular track of diameter 200m in 40s. What will be the distance travelled and displacement at the end of 2 minutes 20s? (2 marks)

5. When do we calculate average speed? A car travels 30km at a uniform speed of 40 km/h and the next 30km at a uniform speed of 20km/h. Find its average speed. (3 marks)

Chemistry (8 marks)

1. The melting points of four solids A, B, C and D are: 78 degree C, 262 degree C, 100 degree C and 168 degree C. Arrange them  in increasing order of their interparticle forces of attraction.

2. Give reasons

(a) Oxygen is a gas at room temperature.

(b) Gases exert pressure on the walls of the container.

3. Compare in tabular form the properties of solids, liquids and gases with respect to

(a) Compressibility

(b) Movement of particles

(c) Shape and volume

4. (a) Define latent heat of vaporization

(b) Convert the following temperatures to the Kelvin Scale

(i) 250 degree Celsius

(ii) 460 degree Celsius

Biology (8 marks)

One mark questions

1. Name the scientists who made the following discoveries.

(a) Discovered the free living cells in the pond water

(b) Coined the term protoplasm

2. How can fungi and bacteria withstand much greater changes in the surrounding medium than animal cells?

Two mark questions

3. What will happen if:

(a) A fully turgid plant cell is placed in a hypertonic solution? Name the phenomenon.

(b) A muscle cell is kept in distilled water for one day

4. Define the following.

(i) Endocytosis

(ii) Osmosis

(iii) Eukaryotes

(iv) Chromatin material

5. Draw a neat diagram of a cell and label the following parts with their appropriate term.

(a) Undefined nuclear region

(b) Source of protein synthesis

(c) Outer layer

(d) Inner layer