SEE 2081 Gandaki Province — Science Past Paper

Full marks: 75 · Time: 180 · With step-by-step model answers in Nepali & English.

1. Q1.

   Choose the best alternative to the following questions and write the answer in the answer-sheet.

   • (a) Which one of the following is the correct relation between nibble and byte? (i) 1 nibble = 4 byte (ii) 2 nibble = 1 byte (iii) 4 nibble = 1 byte (iv) 8 nibble = 1 byte
   • (b) Identify the characteristic of the animal that belongs to phylum Coelenterata. (i) Its body has numerous pores. (ii) It is found on land. (iii) It moves with the help of tentacles. (iv) It is unicellular.
   • (c) Which one of the given genetic codes represents the body of a male human? (i) 22 + y (ii) 44 + xy (iii) 44 + xx (iv) 22 + x
   • (d) What is the relationship between weight of an object (w) and acceleration due to gravity (g)? (i) W = g (ii) W ∝ g (iii) W ∝ 1/g (iv) W = 2g
   • (e) What could be the gravitational force produced between object A (4 kg) and object B (10 kg) placed 2 m apart? (i) 6.67×10⁻¹⁰ N (ii) 6.67×10⁻¹¹ N (iii) 6.67×10⁻¹² N (iv) 6.67×10⁻¹³ N (Refer to the diagram in the original question paper.)
   • (f) Which one of the following statements is correct about an electromagnetic wave? (i) Wavelength and frequency of violet ray are the highest. (ii) Wavelength of violet ray is less and frequency is high. (iii) Wavelength and frequency of violet ray are the lowest. (iv) Wavelength of violet ray is maximum and frequency is less.
   • (g) As shown in the figure, if the magnet is inserted into the solenoid, the needle of the galvanometer is deflected. What could be the reason for this? (i) Motor effect (ii) Electromagnetic induction (iii) Mutual induction (iv) Magnetic effect of current (Refer to the diagram in the original question paper.)
   • (h) A metal element has one electron in its valence shell. When this element reacts with a halogen of the third period, which compound is produced? (i) MgCl2 (ii) CaCl2 (iii) KCl (iv) NaBr
   • (i) Why is it important to know a person's blood type before blood transfusion? (i) To know the person's overall health (ii) To identify possible genetic disorder (iii) To prevent the possible fatal risk of the person (iv) To determine the person's blood pressure
   • (j) Which of the following groups is a chemical insecticide? (i) DDT, BHC, aldrin (ii) Potassium chloride, benzene, benzoic acid (iii) Methoxy chloride, benzene, benzoic acid (iv) Potassium chloride, sodium lauryl sulphate, di-aldrin
2. Q2.

   Write very short answers to the following questions.

   • (a) Write a precaution to be taken for digital well being.
   • (b) Write Archimedes' principle.
   • (c) Write a reason for using water as a cooling agent.
   • (d) Draw a ray diagram to show total internal reflection when a ray of light passes from water to air.
   • (e) Write any one way to increase the amount of induced electricity in a dynamo.
   • (f) Write a use of the organic compound given in the figure.
   • (g) Draw a time-current graph of alternating current.
   • (h) Write the general molecular formula of an alkyne.
   • (i) Write a difference between ethane and ethene.
3. Q3.

   Test the validity of the equation v² = u² + 2as by unit-wise analysis.

4. Q4.

   In which division are moss and banana kept?

5. Q5.

   Write the phylum of an animal whose body is bilaterally symmetrical and covered by chitin, and also write the name of an organism of this phylum.

6. Q6.

   Write one function each that worker bees do during days 7-11 and during days 18-20.

7. Q7.

   Identify the following figures and write any two differences between them.

8. Q8.

   Climate change is one cause of the extinction of animals. Give two other possible causes.

9. Q9.

   "There are plenty of possibilities of medicinal plants in Nepal. It is essential to make local people aware in order to protect and use such medicinal plants." Give any two arguments to support this statement.

10. Q10.

    What is free fall? Write the value of acceleration due to gravity when a body falls freely towards the surface of the Earth.

11. Q11.

    Write any two differences between a closed universe and an open universe.

12. Q12.

    Write the valency of the most reactive metal and the most reactive non-metal from the given table (Na, Mg, Al, Si, P, S, Cl, Ar).

13. Q13.

    Draw a necessary diagram of obtaining pure silver metal from impure silver by the electro-refining method and label any one part of it. (Refer to the diagram in the original question paper.)

14. Q14.

    Study the given diagram and answer the questions below. (Refer to the diagram in the original question paper.)

    • (i) How much upthrust is experienced by the stone?
    • (ii) What is the mass of the stone if its weight in air is 7.35 N?
15. Q15.

    To avoid the negative effect of chemicals like calcium carbide on health, write two methods of ripening bananas grown on a farm using materials available at home.

16. Q16.

    If the number of primary turns is 300, calculate the number of turns in the secondary coil in the given figure.

17. Q17.

    Write any four advantages of using digital communication in daily life.

18. Q18.

    Write any two causes of high blood pressure and two preventive measures of it.

19. Q19.

    According to Mendel's experiment, when a red-flowered (RR) pea plant is cross-pollinated with a white-flowered (rr) pea plant, make a chart to show the offspring formed up to the F2 generation, and also state the phenotypic and genotypic ratio.

20. Q20.

    Study the given graph.

    • (i) Which special character of water is shown in the graph?
    • (ii) How are the density and volume of water affected when it is heated from 0 degrees C to 10 degrees C?
    • (iii) How are aquatic animals benefited from this phenomenon?
21. Q21.

    Two chemical equations are given. (i) 2KClO3 → (MnO2/heat) 2KCl + 3O2 (ii) 2Na + Cl2 → (sunlight/heat) 2NaCl

    • (a) Write any two differences between equation (i) and equation (ii).
    • (b) What are the factors that affect the rate of a chemical reaction in the given chemical equations?
22. Q22.

    One person saw water on the road while walking on a coal-tarred road in extremely high temperature, but he did not find water when he reached the place.

    • (i) What is this condition called?
    • (ii) What is the main cause of this condition?
    • (iii) Write any two conditions required for this process to occur.
23. Q23.

    Observe the given figure and answer the following questions. (Refer to the diagram in the original question paper.)

    • (i) Which gas is collected in the gas jar?
    • (ii) Write a use of the gas formed in this process.
    • (iii) Why is CaO used while preparing this gas?
    • (iv) If a wet red litmus paper is inserted inside the gas jar, what change will be seen in the litmus paper?

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