Question

Sample paper of biology class IX for SA 2

Answer 1

these are some questions based on class 9th SA2 SYLLABUS

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 1.Give one example where kinetic energy is transferred from one object to other.
2. A battery lights a bulb. Suggest the possible energy changes involved in thelighting process.
3. What are the different states in which water is found during the water cycle?
4. List any two human activities that lead to an increase in the carbon dioxidecontent of air.
5. Flash and thunder are produced simultaneously. But thunder is heard a fewseconds after the flash is seen, why? How does the speed of sound in air vary withrise in density of the medium?
6. The volume of 50 g of a substance is 20 cm. If the density of water is 1g/cm, willthe substance float or sink?
7. What are polyatomic ions? Give any two examples.
8. Archimedes could find the purity of a king’s crown using buoyancy. How?
9. a. If an element M has mass number 27 and atomic number 13, how manyneutrons does its atom contain?b. Define Avogadro’s constant. Give its value.
10. (a) Name any two green house gases.(b) What causes global warming?
11. Give two examples each of biodegradable and non-biodegradable pollutants.
12. Write two points of difference between gymnosperms and angiosperms.
13. List any two characteristics of division Pteridophyta that shows they are the mostadvanced cryptogams.
14. a. Draw a diagram depicting low pitched sound and high pitched sound.b. When a person uses deodorant spray, the other person standing at a distancewould hear the sound of spraying first and the fragrance of spray would reach himlater. Why so?
15.(a) How do you define mechanical work?(b) Name and define SI unit of work?(c) What do you mean by positive and negative work? Give example.
16. Explain the working and application of a SONAR.
17. State any three postulates of Dalton’s atomic theory.
18. Calculate the number of molecules of sulphur present in 16 g of solid sulphur.
19. Give two examples of each of the following:a. Diseases which spread through air.b. Diseases which spread through water.c. Diseases which spread through insect.
20. What precautions can you take in your school to reduce the incidence ofinfectious diseases? Mention any three points.
21. List any two benefits of classification.Why bryophytes and pteridophytes grow in moist and shady places?
22. Explain, how HIV-AIDS virus affects and damages our body? What is anantibiotic?23. (a) State the law of conservation of energy.(b) Name the type of energy possessed by the following:(i) stretched slinky (ii) a speeding car(iii) flowing water (iv) stretched rubber band.(c ) An object of mass 50 kg is raised to a height of 600 cm above the ground. Whatis its potential energy? (g = 10 m/s)Or(a) Define kinetic energy. Give examples.(b) Obtain an expression for the kinetic energy of an object of mass ‘m’ andpossessing a velocity ‘v’
.24. (a) Chlorine occurs in nature in two isotopic forms with masses 35 u and 37 u inthe ratio of 3:1. Calculate the average atomic mass of chlorine atom on the basis ofthis data.(b) Give any three uses of three isotopes.Or(a) Write three points of difference between isotopes and isobars.(b) Describe Bohr’s model of the atom?
25. a) Describe with diagram the oxygen cycle operating in nature.b) How depletion of ozone layer takes place?

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