Jagranjosh.com, India’s leading education portal, presents CBSE Class 9 Science Practice Paper for Sumamtive Assessment-II, 2017. This practice paper is specially prepared by the subject experts after the brief analysis of previous year question papers. It consists of the important questions framed as per the latest cbse exam pattern. This paper will surely help the students in understanding the depth with which a topic should be studied in order to prepare in a more effective way to get the desired results.
General Instructions for CBSE Class 9 Science Practice Paper are:
Total Time Allowed: 3 Hrs Maximum Marks: 90
(i) The question paper comprises of two Sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence.
(iv) Question numbers 4 to 6 in Sections-A are two marks questions. These are to be answered in about 30 words each.
(v) Question numbers 7 to 18 in Section-A are three marks questions. These are to be answered in about 50 words each.
(vi) Question numbers 19 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each.
(vii) Question numbers 25 to 33 in Section-B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you. Questions 34 to 36 are short answer questions (2 marks) based On practical skills.
1. Give an example where kinetic energy is transferred from one object to another.
2. Why is the skin of amphibians moist?
3. Name the uncharged particle present inside the nucleus.
4. Explain the term variable valency with the help of two examples.
5. Give an example of each of the following:
(a) A body having potential energy due to change of shape.
(b) A body having potential energy due to its position
6. On a cloudy day, the sound of thunder was heard 10 seconds after the flash of lightning Find the distance of the clouds. Take, speed of the sound in air was 342 ms-1.
7. Give reason for the following:
(a) Nucleus of an atom is charged
(b) Noble gases show low reactivity.
(c) An atom is electrically neutral.
8. Define work. State the conditions under which work is said to be done by a force on an object?
9. A car is moving on a levelled road and gets its velocity doubled. In this process
(a) How would the potential energy of the car change
(b) How would the kinetic energy of the car change
(c) How will its momentum change? Give reasons for your answer.
10. (a) Calculate the mass of 0.2 moles of oxygen molecules.
(b) Convert 12g of oxygen gas into mole.
11. Tabulate three differences between acute and chronic diseases.
12. A ball is thrown vertically upwards and returns to the thrower after 12 sec (g = 9.8 m/s2). Find:
(i) The velocity with which It was thrown up
(ii) The maximum height it reaches.
(iii) Its position after 8 sec.
13. (a) List any two benefits of classification.
(b) Why bryophytes and pteridophytes grow in moist and shady places?
14. Presence of certain features provides the basis for classifying an organism as a chordate. Mention any four features. Name a protochordate.
15. Give reasons for the following:
(a) Bryophytes are called amphibians of the plant kingdom.
(b) Bacteria and tapeworms are very different in their body design.
(c) Fungi are called saprophytes.
16. What is reverberation? How can it be reduced? Give two applications of reflection of sound wave.
17. The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why? State the law of conservation of energy.
18. Agriculture is the occupation in India with three fourth of its total population being engaged in agriculture. Even though financial conditions or some farmers do allow them to take higher level farming practices and improved agriculture technology, yet they are hesitant to use or HYV seeds with traits such as resistance to disease and, high quality that would result finally in higher yield. The Governments’ Kisan channel solved all their apprehensions.
(i) What is meant by genetically modified crops?
(ii) What are the desired agronomic characters for fodder and cereal crops?
(iii) In your opinion what should be done so that the modern agriculture technology is adopted by most of the farmers?
19. Draw a labeled diagram of auditory parts or the human ear and explain how the human ear works.
20. (a) Briefly explain why some objects sink but others float when immersed in a liquid.
(b) When a boat is partially immersed in water, it displaces 500 kg of water. How much is the buoyant force acting on a boat in Newton (g = 10 m/s2)
21. (a) Defne work. Give SI unit of work. Write an expression for positive work done.
(b) Calculate the work done in pushing a box through a distance of 50 m against the force of friction equal to 250 N. Also state the type of work done.
(c) What will be the work done, if displacement of the object is perpendicular to the direction of force?
(d) When an object moves on a circular path, what will be the work done?
22. (a) Explain why are root nodules useful for the plants ?
(b) List and explain any three causes of ‘water Pollution'.
23. List two differences between thrust and pressure. What is meant by 1 Pascal and 1 Newton? How will the pressure change if area of contact is doubled?
24. How is soil formed? What is soil erosion? Elucidate the causes of soil erosion.
25. (a) What are the conditions required by an object to float on water?
(b) Give reason for the following:
(i) A ship made of iron floats while a piece or nail sinks.
(ii) Solid form of water (ice) floats on water.
26. When sodium sulphate solution reacts with barium chloride solution the substance which will appear as precipitate is:
(a) Barnum chloride (b) Barium sulphate
(c) Sodium sulphate (d) Sodium chloride
27. ln the experiment for verification of reflection of sound, the incident sound is directed along:
(a) The axis of the tube.
(b) The normal to the axis or the tube.
(c) An angle of 30o from the axis of the tube.
(d) An angle of 45o from the axis of the tube.
28. A microphone converts:
(a) Sound energy into mechanical energy in stereo system
(b) Sound energy into electrical energy in public address system
(c) Electrical energy into sound energy in ordinary telephone
(d) Microwave energy into sound energy in a mobile phone
29. Which of the following is an example of pulse:
(a) Shock waves caused by the supersonic plane.
(b) Sound waves produced by the clapping of hands
(c) Formation of water waves when a stone is dropped into it.
(d) Giving a jerk to a string tied at one end.
30. Paramecium has tiny hair like projections all around the outside of their cell that give the paramecium locomotion and help the food to move in its oral cavity.
Can you choose the correct name for these locomotory organelles?
(a) Villi (b) Cilia (c) Oral groove (d) Cytopyge
31. The main symptoms of the HIV-AIDS infection are due to the fact that patient’s body can no longer fight off many minor infections and hence becomes the reason of the patient’s ultimate death.
This happens because:
(a) HIV virus alone causes all the infections
(b) HIV virus releases a poison in the body
(c) HIV virus damages the immune system of the body
(d) HIV virus directly attacks the human nervous system
32. What do the parts labelled A, B, C and D indicate?
(a) A - stamen, B - sepal, C- carpel, D - petal
(b) A - sepal, H - stamen, C- petal, D - carpel
(c) A - sepal, B - petal. C- stamen, D - carpel
(d) A - carpel, B - stamen, C- sepal, D - petal
33. Aquatic organisms are used to a certain range of temperature in the water bodies where they live. A sudden marked change in this temperature can affect:
(a) Breeding of animals
(b) More growth of the aquatic plants
(c) Process of digestion in animals
(d) Availability of nutrients
34. State two factors on which buoyant force acting on an object immersed in a fluid depends?
35. A spring balance calibrated in Newton reads 19.6 N. Calculate its mass in grams.
36. When a body hanging with the hook of a spring balance is immersed in a liquid, state the factor due to which the reading of spring balance decreases. Define the factor.