Model Question 1
Grade: Nine Full Marks: 75
Subject: Optional Science Time: 2:15 hrs.
Candidates are required to write their answers according to the instructions given
Attempt all the questions.;a} k|Zgx¿sf] pQ/ lbg'xf];\ .
Group 'A' 15 × 1 = 15
1. Define linear momentum.
2. State Pascal's Law.
3. What is the average amount of solar energy that falls per square meter on the earth's surface?
4. Define superficial expansion of solid.
5. How many electrons are present in one coulomb charge?
6. State Boyle's law.
7. Which gas is formed at Anode and Cathode during electrolysis of water?
8. Define catenation property of carbon.
9. Write the electronic configuration of copper.
10. Define Anatomy.
11. What is the function of capsule or slime layer in Bacteria?
12. Define vaccine.
13. Write the scientific name of plant, which was used by Mendel for his experiment.
14. Name any two improved and cross breeds of cow found in Nepal.
15. Define heliocentric model of solar system.
;d"x …vÚ Group 'B' 13 × 2 = 26
16. Differentiate between nuclear fission and nuclear fusion reaction.
17. Water pipes often burst in cold countries in winter. Why?
18. Glass- slab cannot split a ray of light into its constituent rays. Why ?
19. What is resistance? What are the factors that affect resistance?
20. Write any two limitations of Rutherford's atomic model.
21. What happens when silver bromide is exposed to sunlight? Write with balanced chemical equation.
22. Differentiate between metallic conductors and Electrolytic conductors.
23. Draw the structural formula of Glycerol and write its one use.
24. Differentiate between Prokaryotic cell and Eukaryotic cell.
25. Write any two criticism of Darwinism.
26. The whole body of hydrophytes is covered with waxy substances. Why?
27. Ecotourism promotes the conservation of biodiversity. Justify this statement.
28. Give any two evidences to support the existence of black hole in the Universe.
;d"x…uÚ Group 'C' 6 × 3 = 18
29. The weights of a brick in air, water and salt solution are given in table below. Study the table and answer the questions.
|
Medium |
Weight of brick |
|
X |
25 N |
|
Y |
32N |
|
Z |
20N |
i) Name the media X,Y & Z.
ii) What is the up thrust in water and salt solution?
iii) Calculate the mass of water displaced.
30. A compass needle doesnot show any fixed direction at neutral point. Why? Calculate the resistance of the wire connected to 14v supply through which 11A of current is flowing?
31. If 10 gram of KOH reacts with H2SO4, find to form K2SO4, find the mass of K2SO4 formed.
32. Define electroplating? Draw a well labeled diagram of Gold plating on silver.
33. Describe asexual reproduction in Paramecium.
34. Define Osmosis. Why mitochondria are called power house of a cell?
;d"x …3Ú Group 'D' 4 × 4 = 16
35. What is meant by linear expansion of solids? Derive the relation.
36. What is combined gas law? Derive an expression for combined gas equation/
37. Describe different types of chromosomes based on location of centromere, with diagram.
38. What is a fossil? Explain the process of fossil formation in brief.
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