SEE 2082 Lumbini Province — Science Past Paper

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

1. Q1.

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

   • (a) Which of the following activities involves a digital signal? (i) Talking with each other (ii) Chatting on the internet (iii) Watching antenna-connected TV (iv) Speaking through a loudspeaker
   • (b) Which of the following groups belongs to the Plant Kingdom? (i) Fungi (ii) Protista (iii) Algae (iv) Monera
   • (c) Which blood vessel carries deoxygenated blood from the heart to the lungs? (i) Vena cava (ii) Pulmonary artery (iii) Pulmonary vein (iv) Aorta
   • (d) Which of the following reptiles is NOT included in the list of protected animals of Nepal? (i) Gharial crocodile (ii) Python (iii) Golden monitor lizard (iv) Turtle
   • (e) What will be the weight of an object on a planet having acceleration due to gravity 2.5 m/s², if the object weighs 700 N on the Earth? (i) 240 N (ii) 1750 N (iii) 175 N (iv) 700 N
   • (f) Why does an empty plastic bottle forcefully pushed into water come up when it is released? (i) Due to up-thrust exerted by the bottle on water (ii) Due to up-thrust exerted by the water on the plastic bottle (iii) Due to pressure of water on the plastic bottle (iv) Due to pressure of the plastic bottle on water
   • (g) Study the given figure and identify the colour of x and y. (i) x – red, y – yellow (ii) x – violet, y – red (iii) x – green, y – violet (iv) x – red, y – violet (Refer to the diagram in the original question paper.)
   • (h) Which theory is closely related to Hubble's study? (i) Heliocentric theory (ii) Geocentric theory (iii) Big-bang theory (iv) Hubble's theory
   • (i) Which of the following is the alkyne having 5 carbon atoms? (i) Pentane (ii) Pentene (iii) Pentyne (iv) Pentyl
   • (j) Which of the following is a group of rodenticides? (i) Malathion, aldrin, benzene hexachloride (ii) DDT, sodium chloride, aldrin (iii) Potassium chloride, aldrin, malathion (iv) Bromadiolan, cumatetralyl, zinc phosphide
2. Q2.

   Write very short answers to the following questions.

   • (a) Which is the dependent variable in an experiment where the solubility of sugar is measured at different temperatures?
   • (b) Arrange the following animals in the order of evolution: Cockroach, earthworm, fish, frog.
   • (c) What is high systolic pressure?
   • (d) State the law of pressure that can be verified by the given figure. (Refer to the diagram in the original question paper.)
   • (e) If the power of a lens is +4 D, find its focal length.
   • (f) Draw a ray diagram of the image formed by a lens of focal length 2.5 cm when the object is kept 6 cm away. (Refer to the diagram in the original question paper.)
   • (g) What is meant by “the frequency of alternating current in our country is 50 Hz”?
   • (h) In the given graph of the future of the universe, what type of universe does “B” represent? (Refer to the diagram in the original question paper.)
   • (i) Write the balanced chemical equation for the reaction when the dust (ash) formed by burning magnesium ribbon is added to water.
3. Q3.

   Test the validity of s = ut + ½at² by unit-wise (dimensional) analysis.

4. Q4.

   Write any two characteristics of the division to which Marchantia belongs.

5. Q5.

   Though males have both X and Y sex chromosomes, some of them have only sons and some have only daughters. Explain why.

6. Q6.
   • (a) What type of cell division takes place during the formation of gametes?
   • (b) What type of cell division takes place after the formation of the zygote?
7. Q7.

   Write one function each performed by a worker bee during days 1–3 and during days 18–20 of its life.

8. Q8.

   Your friend needs a strength-enhancing medicinal herb. Which herb would you advise your friend to use? Also write any one method of conserving this medicinal herb.

9. Q9.

   Between the top of a mountain and its base, where will an object weigh more? Write with reason.

10. Q10.

    What is the gravitational force of attraction between the two heavenly bodies shown? In which condition is this gravitational force equal to the gravitational constant?

11. Q11.

    A charger has a transformer that reduces the supply voltage from 220 V to 5 V. Calculate the ratio of the number of turns in the primary coil to that in the secondary coil.

12. Q12.

    Write any two ways to increase the induced current produced by a dynamo.

13. Q13.

    Write any one balanced chemical equation of a reaction that uses a catalyst.

14. Q14.

    The given circuit is used for the electro-refining of a metal extracted from argentite ore. Identify the two main errors in this circuit. (Refer to the diagram in the original question paper.)

15. Q15.

    Write the difference between an alkane and an alkyne on the basis of the number of bonds and the general molecular formula.

16. Q16.

    “It is good to use traditional and chemical-free methods to ripen fruits.” Give any two arguments to support this statement.

17. Q17.

    Nowadays, Facebook Messenger is used for talking with friends through social media.

    • (a) Name two other applications that do what Messenger does.
    • (b) How can students use these applications as support material for their studies? Give any two points.
18. Q18.

    Some information about blood cells is given in the table below:

    • (a) Among them, deficiency of which blood cell causes anaemia?
    • (b) Among them, which blood cell develops immunity in the body?
    • (c) Among them, the excess presence of which blood cell in the blood shows the possibility of risk of a heart attack?
    • (d) Among X, Y and Z, which blood cell will be less in the blood of a person suffering from AIDS?
19. Q19.

    The heat energy required to heat 2000 g of three different liquids by 20°C is shown in the table:

    • (a) Which liquid in the table is appropriate for cooling the hot engine of vehicles? Give reason.
    • (b) At the same temperature condition, what would be the mass of substance C needed to consume 18,400 J?
20. Q20.
    • (a) Draw a labelled diagram of the strands of the cell that carry hereditary characters, showing the nitrogen bases. (Refer to the diagram in the original question paper.)
    • (b) Explain in-vitro fertilisation with a diagram.
21. Q21.

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

    • (a) Which defect of vision of the eye is shown in the figure?
    • (b) Draw the ray diagram showing the correction of this defect.
    • (c) If the image is formed at P, spectacles of which lens would have been used?
22. Q22.

    A part of the modern periodic table is given below. The symbols given in the table are not the real symbols of the elements.

    • (a) Write the symbols of the most reactive metal and the most reactive non-metal given in the table.
    • (b) Write the valency of the element represented by Z.
    • (c) Write the molecular formula of the compound formed by the reaction between elements C and Y.
23. Q23.

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

    • (a) Which gas is prepared by this process?
    • (b) Which chemicals are reacted to produce the gas?
    • (c) Write the balanced chemical equation of the process by which green plants prepare food using this gas.
    • (d) To which colour does this gas change litmus paper?

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