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CBSE Class 9 Pre Board 2019 : Science (St Xavier's Sr. Sec. School, Delhi)

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Annual Examination in SCIENCE Std. 9 19-2-2019 Time : 3 hrs. Max. Marks : 80 General Instructions: i) The question paper comprises of five sections A, B, C, D and E. You are to attempt all the sections. ii) All questions are compulsory. iii) Internal choice is given in sections B, C, D and E. iv) Question numbers 1 and 2 in Section-A are one mark questions. They are to be answered in one word or in one sentence. v) Question numbers 3 to 5 in Section- B are two marks questions. These are to be answered in about 30 words each. vi) Question numbers 6 to 15 in Section-C are three marks questions. These are to be answered in about 50 words each. vii) Question numbers 16 to 21 in Section-D are 5 marks questions. These are to be answered in about 70 words each. viii) Question numbers 22 to 27 in Section- E are based on practical skills. Each question is a two marks question. These are to be answered in brief. SECTION A 1. 2. Define displacement. Give an example where inspite of non-zero distance, displacement is zero. (1) Define : a) Atomicity b) Molecule (1) SECTION B 3. Draw a neat and well labeled diagram only to explain the observations of Rutherford s alpha ray scattering experiment. (2) 4. Differentiate between compost and vermicompost. (2) 5. Explain the following: a) Capture Fishery b) Apiculture (OR) What is animal husbandry? Differentiate between layers and broiler. (2) SECTION C 6. 7. 8. 9. a) b) What does slope of distance-time graph represent. Derive graphically, 2as=v2 - u2. Differentiate beetween g & G. A stone is released from top of tower 19.6 m. Calculate its final velocity just before touching the ground and time taken to reach the ground. (g = 9.8 m/s2) (OR) Differentiate between Thrust & Pressure. The volume of 50g of substance is 30 cm3. If density of water is 1 g/cm3. Calculate will the substance float or sink. (3) (3) a) b) c) What happens when acetone is poured on the palm? Explain. Suggest a method to liquefy gases. When 50g of sugar is dissolved in 100ml of water there is no increase in volume. Which characteristic of particles of matter is illustrated by this observation? (3) a) b) Differentiate between colloidal solution and suspension. (2 points) Which of the following materials fall in the category of a pure substance? i) Milk ii) Iron iii) Calcium Oxide To make a saturated solution 36g of common salt is dissolved in 100g of water at 293K. Find the concentration of the solution at this temperature. (OR) Differentiate between elements and compounds. Explain chemical change with the help of an example. Name the separation technique that you will apply for the following: i) Oil from water ii) Pigments from flowers (3) c) a) b) c) Std. 9 10. -2a) SCIENCE b) On the basis of nucleus and number of chromosomes, differentiate prokaryotes and eukaryotes. Draw a well-labelled diagram of prokaryotic cell. (3) 11. a) b) Name any two processes in which oxygen is used. What are the two ways by which CO2 is returned back into atmosphere? (3) 12. Define frequency. Draw diagrams to differentiate a low pitch sound from high pitch sound. Find depth of ocean if ultrasound waves send by ship returns after 3 sec. Given speed of sound of sound waves in water is 1500 m/s. (3) 13. Give reasons: a) Sound waves are longitudinal waves. b) Walls & Roof of auditorium are covered with sound absorbent material. c) Two astronauts cannot talk on the surface of moon as they can do on the surface of Earth. (3) 14. Differentiate between: a) Acute and Chronic disease. b) Infectious and Non-infectious disease. c) Healthy and disease free. 15. Draw a well-labelled nitrogen cycle. (OR) (3) Draw a well-labelled carbon cycle. (3) SECTION D 16. a) b) 17. a) b) c) a) b) c) 18. a) b) c) d) e) a) b) c) d) e) 19. a) b) State Newton s second law of motion and hence derive the relation between force and acceleration. A girl of mass 40 Kg jumps with a horizontal velocity of 5m/s onto a stationary cart with frictionless wheels. If mass of cart is 5 Kg, then find the velocity of girl as the cart starts moving. (5) Explain with example when work done is zero in spite of non-zero force and displacement. Define Kinetic energy and derive an expression for K.E. A boy of mass 50 kg runs up a staircase of 40 steps in 10 seconds. If height of each step is 15 cm. Find his power. (OR) In a game of tug of war if team A wins over team B then explain the concept of positive and negative work. Define Potential Energy. Derive an expression for P.E. If a ball of mass 500g is thrown up with a velocity of 40 m/s. Calculate P.E. at the top & K.E. at the mid-way. (5) State the law of constant composition. Give an example to illustrate the law. Write the chemical formulae of the following: i) Sodium Carbonate ii) Aluminium Oxide What is the mass percentage of oxygen in H2SO4 molecule? (Atomic masses: H = 1, S = 32, O = 16) How many moles are present in 4g of NaOH? (Atomic masses: Na = 23, O = 16, H = 1) Calculate the number of particles present in 16g of O2 molecules. (Atomic mass O = 16) (OR) Name the atom used as a reference for calculating average atomic masses of other elements. Calculate the molar mass of Fe2(SO4)3. (Atomic masses Fe = 56, S = 32, O = 16) Write the names of the following chemical compounds: i) K2SO4 ii) CaCl2 25 What will be the mass of 3.011 x 10 atoms of N? (Atomic mass: N = 14) How many moles are present in 68g of ammonia (NH3)? (Atomic mass: N = 14, H = 1) (5) Give two applications of isotopes. If Chlorine atom is available in nature in the form of two isotopes, 35Cl (75%) and 37Cl (25%), calculate the average atomic mass of Chlorine atom. Std. 9 -3c) SCIENCE Consider the following table and answer the following questions: ELEMENT A B C D i) ii) iii) iv) ATOMIC NUMBER 8 18 8 20 NUMBER OF ELECTRONS 8 18 20 NUMBER OF NEUTRONS 10 22 8 20 What is the mass number of A? Write the electronic configuration of C. Identify the pair of isotopes from the above elements. What is the valency of B? (5) 20. a) b) Write any two important features that are present in all chordates. Name the largest group of animal. Write any four salient features of this group. (5) 21. a) b) Write the function of xylem tissue. Give one word for the following: i) The process of taking up a permanent shape, size and function. ii) Animal tissue connecting muscles to bone. iii) Long and unbranched extension of a neuron. iv) Connecting tissue with a fluid matrix. Draw a neat diagram of leaf epidermal peel showing stomata. Label any two parts. (OR) What is tissue? Name the tissue in the plant which makes a plant to bend easily without breaking. Where is it located? Write any two differences between : i) Bones and cartilage. ii) The muscles present in the heart and the limbs. (5) c) a) b) c) SECTION E 22. State Archimedes principle. Calculate density of a solid of mass 60gm when dipped in water if the level of water rises from 10ml to 22ml. 23. a) b) 24. 25. 26. 27. Differentiate: Longitudinal & Transverse wave. What is loudness of sound? On what factor does it depend on? (OR) State laws of reflection of sound waves. In what ways experiment of reflection of sound wave is different from experiment of light waves. a) b) Define sublimation. Draw a neat and well labeled diagram to show the separation of common salt and ammonium chloride. (2) (2) (2) A student added zinc granules to a test tube containing sulphuric acid. He observed bubbles of a colourless and odourless gas. a) Name the gas. Give a test to confirm the gas. b) Write the chemical equation involved. (OR) A mixture of iron fillings and sulphur was heated in a china dish. a) Give the formula of the product and the reaction involved. b) Give the reaction of the product with dil. HCl. (2) Give adaptive features of bony fish towards its aquatic habitat. (OR) Feathers are an adaptive feature of birds. How are they helpful to them? (2) a) b) The cells which are elongated and have much thickened cell walls, less lumen with pointed ends are i) Fibres ii) sclereids iii) companion cells iv) none of these The cell body of a nerve cell is called the i) Axon ii) Cyton iii) Dendron iv) none of these -x-x-x-x-x-x-x-x- (2)

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