SEE 2081 Bagmati 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) What is the number of chromosomes in a human skin cell? (i) 40 (ii) 42 (iii) 44 (iv) 46
   • (b) Which is the correct formula to find the focal length of a lens? (i) v = M/u (ii) M = I/o (iii) P = 1/f (iv) f = v/u
   • (c) Which valve controls the blood flow from the right ventricle to the right auricle? (i) Aortic valve (ii) Bicuspid valve (iii) Pulmonic valve (iv) Tricuspid valve
   • (d) Which medicinal plant has the antimicrobial property that can activate the digestive process? (i) Neem (ii) Heart-leaved moonseed (Gurjo) (iii) Asiatic pennywort (iv) Holy basil
   • (e) Which of the following is a di-hydric alcohol? (i) Ethanol (ii) Ethylene glycol (iii) Methanol (iv) Glycerol
   • (f) If the Earth could be squeezed to the size of the Moon, what would be the effect on the value of acceleration due to gravity of the Earth? (i) Increases (ii) Decreases (iii) Becomes zero (iv) Remains the same
   • (g) Which of the following facts is correct? (i) Electric motor changes electrical energy into kinetic energy. (ii) Electric generator changes electrical energy into mechanical energy. (iii) Both electric motor and generator work on the same principle. (iv) Both electric motor and generator change mechanical energy into electrical energy.
   • (h) On which of the following factors does specific heat capacity depend? (i) Mass of matter (ii) Volume of matter (iii) Temperature of matter (iv) Nature of matter
   • (i) Which of the following groups of fundamental units represents the derived unit of energy, Joule (J)? (i) kg ms⁻² (ii) kg ms⁻¹ (iii) kg m²s⁻² (iv) kg ms⁻³
   • (j) If a 500 N force is applied on piston A (area 200 cm²), how much force is produced on piston B? (i) 875 N (ii) 975 N (iii) 1075 N (iv) 1175 N
2. Q2.

   Write very short answers to the following questions.

   • (a) What is the name of the blood vessel that carries blood from the heart to different parts of the body?
   • (b) Write the name of the compound which is formed when ammonia dissolves in water.
   • (c) Why is carbon dioxide gas collected in an erect (upward) gas jar?
   • (d) Write a precaution to be taken by a good netizen.
   • (e) What change does a negative catalyst make to the rate of a chemical reaction?
   • (f) Why is detergent considered less eco-friendly than soap? Give one reason.
   • (g) When a black (Bb) and a brown (bb) dog are crossed, what is the genotypic ratio in the second filial (F2) generation?
   • (h) A student has difficulty reading letters on the board from the last bench due to a defect of vision. Draw a ray diagram of the remedy of the problem of that person.
   • (i) Calculate the refractive index of water, if the speed of light in water is 2.25×10⁵ m/s and in air is 3×10⁸ m/s.
3. Q3.

   Write any two characteristics of a worker bee.

4. Q4.

   Mention any two effects of climate change.

5. Q5.

   Write two differences between an independent variable and a dependent variable.

6. Q6.

   Write the class of a sparrow and the division of a fern.

7. Q7.

   What difficulties would Mendel have faced if he had used the apple plant instead of pea for his experiment? Write in two points.

8. Q8.

   In the given figure, what does 16 N represent? What should be the weight of the object to float on the water? (Refer to the diagram in the original question paper.)

9. Q9.

   Differentiate between the flat universe and the closed universe in two points.

10. Q10.

    Answer the questions on the basis of the given chemical equations. Reaction A: MgO + H2O → Mg(OH)2 Reaction B: Zn + dil H2SO4 → ZnSO4 + H2

    • (i) Out of these two chemical equations, which one is the combination reaction?
    • (ii) What happens when concentrated H2SO4 is used instead of dilute H2SO4 in chemical reaction B?
11. Q11.

    Draw a neat and clean diagram of the laboratory preparation of carbon dioxide gas. Write the name of the salt used in this process.

12. Q12.

    Although the use of pesticides is considered a major concern for agriculture, write two reasons why its use continues.

13. Q13.

    Among the animals peacock, crocodile, snake, whale and sea-horse, which is the mammal and which is the least developed animal?

14. Q14.

    How much heat energy is required to raise the temperature of 700 g of water from 5°C to 40°C?

15. Q15.

    You are using the process shown in the figure to obtain pure silver from impure silver. (Refer to the diagram in the original question paper.)

    • (i) Between A and B, in which part will you put the impure silver?
    • (ii) What is the role of 'C' in obtaining pure silver?
16. Q16.

    Write the structural formula of the saturated hydrocarbon having molecular mass 44 amu. Write the IUPAC name of the compound obtained by removing two hydrogen atoms from adjacent carbons.

17. Q17.

    Write any two characteristics of each of the s-block and p-block elements of the modern periodic table.

18. Q18.

    Find the independent and dependent variables in the following events:

    • (i) More growth of a plant in sunlight.
    • (ii) Measuring the stretch of a catapult and the distance covered by the stone thrown by it.
19. Q19.

    Draw a diagram to show the dispersion of white light as it passes through a prism. Write two causes of the dispersion of light.

20. Q20.

    The report of WBC, RBC and platelet counts of a person is shown in the following table:

    • (i) Which of the blood cells is in normal condition?
    • (ii) Write a problem that arises due to the number of X blood cells.
    • (iii) If the count of cell Y decreases and reaches 1,50,000, what would be the problem in the person?
    • (iv) Name the blood cell W.
21. Q21.

    Questions about a transformer.

    • (i) When 240 V is passed in the primary coil of a transformer, 480 V is induced in the secondary coil. If there are 300 turns in the primary coil, how many turns will be in the secondary coil?
    • (ii) Why is the core of a transformer laminated?
    • (iii) Can a transformer be used in a DC circuit? Give one reason.
22. Q22.

    Nowadays, sperms are collected from a male animal by artificial methods and fertilization is done by inserting the sperms mechanically into the uterus of a female.

    • (i) Write any two advantages of this technology.
    • (ii) Write two points to be considered while performing this technology.
23. Q23.

    In the given figure, the masses of A and B are 6×10²⁴ kg and 400 kg respectively, and the radius of A is 6400 km. (Refer to the diagram in the original question paper.)

    • (i) Calculate the gravitational force between the objects A and B (B rests on the surface of A).
    • (ii) To what height should object B be taken from the surface of object A so that the value of acceleration due to gravity becomes 6 m/s²?

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