CBSE Class 9 Science Sample Paper Set 16

SECTION-A

1. Lysosomes are known as the suicide bags of the cell Give reason.

2. The rate of evaporation of a liquid increases on heating. Explains.

3. Name the physical quantity whose unit is:

i) kg m/s ii) N m²kg^-2

4. Explain how during the burning of a candle, both physical and chemical changes take place.

5. It is difficult to balance our body when we accidentally slip on a peel of Banana. Explain why? 

6. What are the advantages of rearing dairy animals?

7. Give any three distinguishing characters of collenchyma and parenchyma.

8. Differentiate between homogeneous and heterogeneous mixture with the help of two examples.

9. With the help of a labelled diagram, describe in brief the process of sublimation.

10. Cough syrup is a common medicine used in cold and cough. It contains alcohol (ethanol) as one of its constituents. Some of the people use it as an alternative of wine.

(i)What should the government do’ to prevent the misuse of such medicines? 

(ii)Which is the most common method for expressing the concentration of a solution?

(iii) 25 g of salt is dissolved in 100 g of water at 293K. What is the concentration of solution at this temperature?

11.There are three beakers A, B and C having salt in water, milk in water and sand in water respectively. Categorize these as colloids ,suspension and true solution. Differentiate these three in terms of particle size, Tyndall effect and stability.

12. Starting from a stationary position, Rehan paddles his bicycle to attain a velocity of 6 m/s in 30 s. Then he applies brakes such that the velocity of the bicycle comes down to 4m/s in the next 5 s. Calculate the acceleration of the bicycle in both the cases.

13. A car acquires a velocity of 72 km/hr in 10 seconds starting from rest. Find

a) The acceleration

b) The distance travelled in this time and c) The average velocity

14. State and derive the Jaw of conservation of momentum.

15. According to Newton's law of gravitation, the apple and the Earth experience equal and opposite forces due to gravitation. However, it is the apple which falls.towards the Earth and not vice versa. Why?

16. Describe any three functions of the ER.

17. Name the following:

i. Epithelial tissue containing thin, flat, irregular cells·

ii. Epithelial tissue found in the ducts of salivary glands

iii. Epithelial tissue present in glands such as the thyroid and pituitary glands

18. What are the management practices required to be taken in a livestock farm to ensure a healthy and productive livestock population?

19. (a) Name the appropriate methods to separate the following:

(i) Nitrogen from air ,

ii) Dye from blue ink

(iii) Cream from milk

(iv) Ammonium chloride from common salt

(b) Crystallization is a better technique than simple evaporation. Give one reason to justify the statement.

(c) Draw a labelled diagram to show the process of separation of immiscible liquids.

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