CBSE Class 9 Science Sample Paper Set 12

SECTION - A 

Q.1 Name the cells which transmit the stimulus very rapidly from one place to another within the body. (1)

Q.2 What is the SI unit of the universal gravitation constant (G)? (1)

Q.3 Under what condition will the magnitude of displacement be equal to the distance travelled by an object ? (1)

Q.4 What do you understand by diffusion? State the factors on which diffusion depends. (2)

Q.5 Why are plants and animals made up of different tissues ? (2)

Q.6 Account for the following :

(a) Karate player breaks a slab of tiles in a single blow.

(b) An athelete after a long jump falls on a cushion bed. (2)

Q.7 List two differences between a pure substance and a mixture. Give one example of each. (3)

Q.8 Define evaporation. Explain any two factors affecting its rate. (3)

Q.9 With the help of a flow diagram, show the process of obtaining different gases from air.

If the boiling points of Oxygen. Argon and Nitrogen are -183°C, -186°C and -196°C, which gas gets liquified first as the air is cooled ? (3)

Q.10 What are living organisms made up of? Why are they called structural and functional unit of life?(3)

Q.11 Differentiate between bone and cartilage with respect to structure, function and location. (3)

Q.12 On what factors do the magnitudes of the following physical quantities depend?

(i) Momentum (ii) Force (iii) Inertia. (3)

Q.13 (i) If the force of gravity on Mars is 3.8 ms^-2, then what would be the weight of an object on mars which has a mass of 10kgs on earth?

(ii) What would be its weight on earth?

(iii) From the above data, analyse what will be the percentage difference of your weight on earth and on mars? (3)

Q.14 A man travels a distance of 1.5 m towards East, then 2.0 m towards South and finally 4.5 m towards east.

(i) Calculate the total distance travelled.

(ii) Calculate the resultant displacement.  (3)

Q.15 What is meant by uniform velocity and variable velocity ? Explain giving an example of each.  (3)

Q.16 Explain reason for the following :

(i) When a ball is dropped from a height, its speed increases gradually.

(ii) A moving bicycle slows when we stop pedalling it.

(iii) When a tree is shaken, its fruits and leaves fall down.  (3)

Q.17 Ashok lives in such a village of Bengal where the main occupation of villagers is fish production. He suggested them to keep five or six fish species in a pond. The villagers were surprised to see this increased the fish yield from the pond. They thanked Ashok and asked him to help them get pure fish seed for the other two ponds in the village.

(i) What name is given to this intensive fish farming ?

(ii) Write the basis on which the different fish species are selected ?

(iii) Ashok’s initiative is worth praising. Give two reasons.  (3)

Q.18 Give two examples of each case :

(a) Exotic breeds of cow

(b) Indigenous breeds of cow

(c) Indigenous and exotic breeds of poultry birds. (3)

Q.19 Define the term – solution. Identify the solute and solvent in the following solutions –

(i) Tincture of iodine (ii) Polluted air

(iii) soda water (iv) Dilute Hydrochloric acid  (5)

Q.20 Give reasons for the following observations :

(a) The smell of lighted incense stick reaches several metres away.

(b) A liquid has fixed volume but not fixed shape.

(c) Ice floats on water

(d) A wooden door is called a solid at room temperature.

(e) Sponge is a solid yet it can be compressed. (5)

Q.21 Explain the significance of the following : -

(a) Hair like, structures on epidermal cells. 

(b) Epidermis has a thick waxy coating of cutin in desert plants. (5)

(c) Small pores in epidermis of leaf.

(d) Numerous layers of epidermis in cactus.

(e) Presence of a chemical suberin in cork cells.

Q.22 Write the three equations (showing relation between initial velocity, final velocity, acceleration, time and distance covered) for the uniformly accelerated motion. Also derive the relation between (a, u, t and s) and (v, u, a and s) by graphical method. (5)

Q.23 Write three points of difference between mass and weight? How much would a 70 kg astronaut weigh on the moon? What would be his mass on the earth and on the moon? (5)

Q.24 Excessive use of fertilizers and chemical pesticides is harmful – justify the statement.

How can this problem be solved ? (5)

SECTION – B

Q.25 Samples of Coriander powder, mustard seeds, tea leaves and arhar dal were taken in four different test tubes. A few drops of conc hydrochloric acid were added in each of the test tube. You will observe pink colour in the sample of :

(a) Coriander powder (b) mustard seeds

(c) tea leaves (d) arhar dal (1)

Q.26 Two students A and B were given two samples of yellow dal (Arhar) in two different test-tubes, out of which the sample given to A was adulterated with metanil yellow and the one given to B was unadulterated. They were asked to test both the samples with conc. HCl. Both of them added 10 mL of water to their samples and then added few drops of conc. HCl in it. The respective observation A and B regarding colour of the solution will be :

(a) pink, no change (b) pink, pink

(c) no change, pink (d) no change, no change (1)

Q.27 Carbon disulphide should be kept away from the flame as :

(a) It is a toxic liquid. (b) It is a supporter of combustion.

(c) It is a combustible liquid. (d) It is corrosive. (1)

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