XI Biology Note

Opt Sci. 9 2

Model Question 2

Class :- 9 Subject: OPT Science F. M. 75

Time :- 2:15 hrs

 

Group 'A' 15×1=15

1. Write Short answer of the following questions.

a)     What is simple pendulum?

b)    Write any two applications of pascals law.

c)     Define the term Alternative sources of energy.

d)    Write the name of each colour serially which are obtained after refraction of light.

e)     Define Neutral point.

f)     What is an ideal gas?

g)    Write the name of positive and negative catalyst.

h)    Write the name of electrolyte used in copper plating.

i)      Define prokaryotic cell.

j)      Who is called the father of genetics?

k)    Give an example of mutualism.

l)      Give one adaptational feature of Fossorial animals.

m)   Define Ecotourism.

n)    What is metallurgy?

o)    The earth is called blue planet, Why?

 

Group 'B' 13×2=26

2. The weight of an iron ball in air, water and salt solution is given in the table below. Study the table and answer the following questions.

Medium	Weight
A	15N
B	20N
C	25N

i)               Indentify the medium A,B and C

ii)             Find the up thrust in salt solution.

 

 

 

3. In context of Nepal. Hydroelectricity is the best alternative source of energy, Explain.
4. The volume of solid sphere of iron at 20⁰c is 2.5×10^-3m³ Find the increase in volume of sphere when it is heated up to 100⁰c? (Linear expansivity of iron = 12×10^-6k^-1.)
5. Write the ohm's law.
6. Differentiate between Cations and anions.
7. What is electrolysis of water? Show that the electrolysis of water in ionic form .
8. Write the IUPAC Name of following compounds.

i)               CH₃-C = CH ii) CH₃-CH₂-CH₃

9. Write the name of Iron and silver ore.
10. Write two points to support the relations of biology with physics.
11. Differentiate between Aerobic and anaerobic respiration.
12. Give scientific reason, Why air sacs present in aerial animals?
13. What is the main purpose of cow farming?
14. All ores are minerals but all minerals are not ores, justify this statement.

 

Group 'C' 6×3=18

15. A bus moving with speed 45 km/ hr is stopped by applying brakes within 5 sec. Calculate the retardation and distance travelled by the bus before stop.
16. What is fibre optics? Write two uses of it.
17. Describe Rutherford's alpha-particle scattering experiment with the help of diagram.
18. State the Graham's law of diffusion. Also prove it's mathematical expression.
19. Study the given figure and answer the following questions.

i)               Write the name of parts A,B and C

ii)             Name the diagram given alongside.

iii)           Write one function of A.

 

 

 

 

20. Define variation. What are the major roles of DNA in our body?

 

Group 'D' 4×4=16

21. Show that the neutral points formed when a magnet is kept vertically by facing magnetic north pole towards geographical north and magnetic south pole towards geographical south with diagram.
22. What do you mean by hydrolysis reaction? What information can be obtained from balanced chemical equation, Write any three points.
23. What do you understand by protozoology? Explain the cellular structure of a paramecium with the help of labelled diagram.
24. Name the hypothesis about the origin of solar system and describe in brief about any two.

The End

Opt Sci. Model 1

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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