CBSE Class 9 Science Sample Paper Set 7

SECTION-A

1. Is it possible that the train in which you are sitting appears to move while it is at rest?

2. At what temperature does solid ice and liquid water co-exist together? 

3. Which cell organelle controls most of the activities of the cell? 

4. A naughty boy standing at the top of a steep hillock drops a stone. The stone reaches the ground after 5 s. What is the height of the hill? With what velocity will it strike the ground? (Take g = 9.8 ms^–2) 

5. A sample of water boils at 101°C at normal temperature and pressure. Is the given sample of water pure? Will this water freeze at 0°C? 

6. Why do plant cells possess large sized vacuole? 

7. Write one function each of the following :

    (a) Tendon

    (b) Ligament 

8. (i) How does the rate of diffusion of the following change?

    (a) Diffusion of a solid in a liquid on heating.

    (b) Diffusion of a gas in a liquid on heating.

    (ii) Gases diffuse faster than liquids and solids. Explain.

    (iii) Name the process due to which water kept in an earthen pot oozes out of its pores. 

9. How is meristematic tissue classified on the basis of its location? Draw a well labelled diagram to show the location of meristematic tissue in a plant body. 

10. What are the advantages of inter-cropping and crop rotation? 

11. Name the type of colloids in each in which dispersed phase and the dispersing medium are respectively : 

     (a) liquid and gas.

     (b) liquid and liquid.

     (c) liquid and solid.

Give one example of each.

12. The velocity-time graph shows the motion of a cyclist. Find (i) its acceleration (ii) its velocity and (iii) the distance covered by the cyclist in 15 seconds.

13. Draw diagrams to show the difference between the structures of the three types of muscles fibres. 

14. What is plant breeding? Write about one technique of plant breeding. 

15. A bullet of mass 20 g is horizontally fired from a pistol of mass 2 kg with a horizontal velocity of 150 m/s. Calculate the recoil velocity of the pistol. 

16. A motor-car of mass 1200 kg is moving along a straight line with uniform velocity of 90 kmh^–1. Its velocity is slowed down to 18 kmh^–1 in 4 s, by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of force required. 

17. Why is the cell called the structural and functional unit of life? 

18. A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upward from the ground with a velocity of 25 ms^–1. Calculate, when and where the two stones will meet. [Take g = 10 ms^–2].