CBSE Class 9 Science Sample Paper Set 51

SECTION – A

1. A substance has a definite volume but no definite shape. State whether this substance is a solid, liquid or a gas.

2. What is the resultant force of a number of balanced forces acting on body? 

3. Name the plastids which have chlorophyll . 

4. State the difference between homogeneous & heterogeneous mixture . Give one example of each.

5. What is the relation between the mass and the weight of the body ? What are the differences between the two ?

6. State two differences between a mitochondria and plastid. 

7. Mention the significance of meristems in plants. 

8. Give reasons :

   a) A sponge can be pressed easily; still it is called a solid.

   b) Water vapours have more energy than water at same temperature.

   c) Naphthalene balls disappear with time without leaving any solid.

9. What is meant by concentration of a solution. Calculate the concentration of a solution which contains 12 g of urea in 160 g of solution

10. Which of the following has more inertia & Why ?

   a) A rubber ball and a stone of the same size .

   b) A bicycle and a train.

11. Two similar trucks are moving with a same velocity on a road. One of them is loaded while the other is empty. Which of the two will require a larger force to stop it?

12. Consider two bodies A and B. The body B is heavier than A. Which of the bodies is attracted with a greater force by earth? Which of the two will fall with greater acceleration? Explain.

13. Show that if a body is taken to a height H above the earth’s surface acceleration due to gravity is decreased by the factor R2 /(R+H)2 ,Where R is the radius of the earth.

14. State the ways in which phloem is functionally different from Xylem. 

15. Draw a neat diagram of a section of Phloem and label four parts. 

16. Give one important functional difference amongst the muscle tissues and draw a labeled diagram of the muscle tissue which never shows fatigue.

17. Which cell organelle would you associate with elimination of old and worn out cells & Why?

18. Which two factors bring about loss of food grains during storage? Give one example each. State any two control measures to be taken before grains are stored.