SEE 2082 Koshi Province — Science Past Paper

Full marks: 75 · Time: 3 hours · With step-by-step model answers in Nepali & English.

1. Q1.
   • (a) If an experiment is done to find how various amounts of fertilizers affect the height of a tomato plant, what is the independent variable in this experiment? (i) Height of tomato plant (टमाटरको उचाइ) (ii) Amount of fertilizer (मलको मात्रा) (iii) Amount of water (पानीको मात्रा) (iv) Type of soil (माटोको प्रकार)
   • (b) Which of the following statements is true about baseband transmission? (i) Digital signals are converted to analog signals and sent to the channel. (ii) Separate channels are used for sending and receiving signals. (iii) Sending and receiving signals are done in the same channel simultaneously. (iv) Generally, it is used for long distance communication.
   • (c) How does plantation of trees help reduce the effect of climate change? (i) By increasing oxygen level in the atmosphere (ii) By reducing the amount of carbon dioxide through photosynthesis (iii) By lowering the temperature of the environment (iv) By making a lot of rainfall
   • (d) If the weight of an object on the surface of the Moon is 66 N, what might be the weight of the object on Earth? (Acceleration due to gravity of Moon is 1.62 m/s²) (i) 396 N (ii) 66 N (iii) 11 N (iv) 6.6 N
   • (e) How much force is produced in piston Q in the given figure? (i) 80 N (ii) 100 N (iii) 400 N (iv) 500 N
   • (f) What is called the effect of heat on the volume of an object? (i) Thermal expansion (थर्मल प्रसार) (ii) Thermal conduction (थर्मल प्रवाह) (iii) Thermal equilibrium (थर्मल सन्तुलन) (iv) Thermal radiation (थर्मल विकिरण)
   • (g) If a transformer has more turns in the secondary winding than in the primary winding, which of the following statements is correct? (i) It does not change A.C. voltage. (ii) It decreases A.C. voltage. (iii) It increases A.C. voltage. (iv) It increases A.C. voltage according to the situation.
   • (h) Which of the following shows the correct order of the atomic radii of the elements nitrogen, oxygen and fluorine? (i) O < R < N (ii) N < F < O (iii) O < N < F (iv) F < O < N
   • (i) Which is the correct order of metal processing for their purification? (i) Concentration, Oxidation, Refining, Reduction (ii) Concentration, Reduction, Oxidation, Refining (iii) Concentration, Reduction, Refining, Oxidation (iv) Concentration, Oxidation, Reduction, Refining
   • (j) Which of the following is a fungicide? (i) Cypermethrin (साइपरमेथ्रिन) (ii) Carbendazim (कार्बेन्डाजिम) (iii) Butachlor (ब्युट्याक्लोर) (iv) Zinc Phosphide (जिन्क फोस्फाइड)
2. Q2.
   • (a) Write any one difference between rare and endangered species.
   • (b) Write one medicinal use of the organism shown in the figure.
   • (c) Write the principle which explains why a ship floats in water.
   • (d) To which special property of water is the given graph related?
   • (e) What is the relationship between thickness and focal length of a lens?
   • (f) Give any one reason for elements in the same group having the same valency despite differences in atomic size.
   • (g) Write the balanced chemical equation that takes place while heating calcium carbonate.
   • (h) Show the diagram of purification of impure copper by the electro-refining method.
   • (i) A saturated hydrocarbon has a molecular mass of 58 amu. Write its IUPAC name.
3. Q3.

   Check the validity of the equation v = u + at² by its unit-wise analysis.

4. Q4.

   Write the difference between the given organisms (Figure A = horse, Figure B = sea-horse) based on respiration and reproduction.

5. Q5.

   Fern does not bear flowers, pine bears flower but no fruit, banana bears flower as well as fruits. However, all these plants are kept in the same division. Give two reasons for this.

6. Q6.

   Study the given concept map and write the name of P and Q bees, where P and Q are formed by different processes.

7. Q7.

   Write any two differences between mitosis and meiosis cell division.

8. Q8.

   Draw a labelled chart showing the sex determination in human beings.

9. Q9.

   Study the table about the blood test of person X . (a) What type of blood group does person X have? (b) If person X needs blood, which antigen must not be present in the donor's blood?

10. Q10.

    Calculate the amount of heat energy required to raise the temperature of 500 g of water from 30°C to 90°C.

11. Q11.

    Copy these figures in the answer sheet and complete the ray diagrams.

12. Q12.

    How does the conclusion of Hubble's study support the Big Bang theory? Mention any two points.

13. Q13.

    Study the electronic configuration of element X (1s², 2s² 2p⁴) and Y (1s², 2s² 2p⁶, 3s² 3p⁶, 4s¹). (a) In which group of the periodic table does element X lie? (b) Write the chemical nature of element Y.

14. Q14.

    When a student stored dilute hydrochloric acid in a zinc bottle, he found that the wall of the bottle got thinner. Justify, with a balanced chemical equation, the cause of this observation.

15. Q15.

    Study the structure of the given organic compound. (a) Write the general molecular formula of the compound. (b) In which group of organic compounds does this compound belong?

16. Q16.

    When a person forgot to close the jar of pickle, it got spoiled within a few days. Apply your knowledge of food preservation to explain why the pickle got spoiled and what should be done to prevent it.

17. Q17.

    Write any two negative impacts of digital technology in our society. How do you use ICT to be a good digital citizen? Mention any two points.

18. Q18.

    (a) State Mendel's law of dominance. (b) Draw a chart showing both phenotype and genotype of offspring produced from dogs of black (BB) and white (bb) colour in the first and second filial generation according to Mendel's experiment. Also write the ratio of phenotype and genotype of the second filial generation.

19. Q19.

    Study the given figure. (a) Name the parts A and C. (b) Write the name of any one type of protein found in D. (c) What happens if the number of B cells in the blood of a person increases abnormally?

20. Q20.

    (a) Why is it not possible to land safely on the Moon using a parachute? (b) The masses of two heavenly bodies are 2x10^30 kg and 1.9x10^27 kg, distance between centres 1.8x10^8 km. Calculate the gravitational force between them. What would be the force if the distance is made 3.6x10^8 km?

21. Q21.

    (a) A convex lens has focal length 4 cm. Draw a ray diagram for the image formed when an object is kept at 8.5 cm in front of the lens. Also calculate its power. (b) Which lens is used to remedy short-sightedness? Show with a ray diagram.

22. Q22.

    (a) Write any two differences between direct current and alternating current. (b) Write any two ways of increasing the electricity (current/voltage) produced from a dynamo.

23. Q23.

    Study the figure and answer. (a) Which gas is being produced in the given figure (HCl on limestone)? Write the balanced chemical equation that occurs. (b) Write the molecular formula of the compound formed when the gas is dissolved in water. (c) Write a method to test the gas in the laboratory.

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