SEE 2082 Gandaki Province — Science Past Paper

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

1. Q1.
   • (a) Why is sea-urchin kept in phylum Echinodermata? (i) Because their bodies are externally covered by hard calcareous spines. (ii) Because they have muscular feet to help in swimming in water and gliding on the surface. (iii) Because their body is soft. (iv) Because it has tentacles on the head.
   • (b) Which of the following statements is correct about a queen bee? (i) Queen bee feeds honey and bread to larvae. (ii) Queen bee makes the hive warm. (iii) A hive has a large number of queen bees. (iv) In a hive the queen bee lives the longest.
   • (c) Which of the following plants has antioxidant, antimicrobial property as well as the capacity to relieve stress, depression and anxiety? (i) Turmeric (वेसार) (ii) Asiatic pennywort (घोडटाप्रे) (iii) Gurjo (गुर्जो) (iv) Neem (निम)
   • (d) What will be the weight of a man on the Moon, if his weight on the Earth is 750 N? (Acceleration due to gravity of the Moon = 1.63 m/s²) (i) 124.7 N (ii) 125 N (iii) 126.8 N (iv) 127.8 N
   • (e) Which of the following phenomena is based on the high specific heat capacity of water? (i) The temperature of water in the ocean does not vary much between day and night. (ii) Even when the surface of a mountain lake freezes in winter, fish don't die. (iii) Water pipes burst in winter. (iv) Temperature of water remains constant while boiling.
   • (f) Which of the following correctly describes the properties of an image formed by a convex lens when the object is placed between 'f' and '2f'? (i) Virtual, erect and diminished (ii) Virtual, inverted and magnified (iii) Real, inverted and magnified (iv) Real, erect and magnified
   • (g) A transformer has 6,000 turns in the primary coil and 1,000 turns in the secondary coil. Calculate the secondary voltage if the primary voltage is 210 V. (i) 25 V (ii) 35 V (iii) 45 V (iv) 55 V
   • (h) Which substance is the product 'Z' in the given chemical reaction? CO2 + H2O -> Z (i) HCO (ii) H2CO2 (iii) H2CO3 (iv) COOH
   • (i) Which of the following represents an alkene? (i) CnH2n+2 (ii) CnH2n-2 (iii) CnH2n-1 (iv) CnH2n
   • (j) Which of the following compounds is used to ripen fruits? (i) Sodium carbonate (सोडियम कार्बोनेट) (ii) Calcium carbonate (क्यालसियम कार्बोनेट) (iii) Calcium carbide (क्यालसियम कार्बाइड) (iv) Sodium sulphate (सोडियम सल्फेट)
2. Q2.
   • (a) Certain variables should be controlled in a scientific experiment, why?
   • (b) Write an application of QR code.
   • (c) Write a characteristic of the given organism on the basis of respiration.
   • (d) Write a function of a worker bee after 21 days.
   • (e) Why can't a digital clinical thermometer be used to measure the temperature of boiling water?
   • (f) Write any one difference between the following figures on the basis of their working principles. (Figure A and Figure B)
   • (g) Draw a current-time graph of alternating current.
   • (h) Draw a well labelled diagram of the electro-refining process of purification of impure silver.
   • (i) An ore contains a mixture of iron dust and zinc sulphide. Which method can be used to separate them?
3. Q3.

   Write the example of other two types of variable involved in a scientific experiment, except the controlled variable.

4. Q4.

   Write any two differences between frog and fish based on the habitat and the structure of heart.

5. Q5.

   Study the given figures and write any two differences between them. (Figure A and Figure B)

6. Q6.

   Which process is represented by the given chart? According to this process, what is the main difference between the organism with (44, xx) and (44, xy)?

7. Q7.

   Identify the health problem which has symptoms like sweating, feeling tiredness, difficulty in respiration, feeling intolerable pain due to stress in chest etc. Write a preventive measure of this problem.

8. Q8.

   A student used the sap of the leaves of the plant shown in the figure when her/his skin was burnt by steam. For what other two purposes can this plant be used?

9. Q9.

   Why does a stone sink when dropped in water? Explain on the basis of the law of floatation.

10. Q10.

    When a magnet is introduced into a coil, what happens to the needle of the galvanometer? If the magnet is held at rest inside the coil, what will happen to the needle?

11. Q11.

    If hot water of mass 10 kg at 90°C is mixed with 20 kg of cold water at 20°C, what is the final temperature of the water? (Specific heat capacity of the mixture is 4200 J/kg°C.)

12. Q12.

    Define the process which is shown in the figure and write any one application of it.

13. Q13.

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

14. Q14.

    A student mixed 10 ml ammonium hydroxide with 10 ml hydrochloric acid in a beaker. (a) What type of chemical reaction takes place in the beaker? (b) Write the balanced chemical equation of the reaction.

15. Q15.

    A colourless viscous liquid hydrocarbon is used as a sweetening agent in confectionery. (a) Write the IUPAC name of this compound. (b) Write the structural formula of the compound formed by replacing all -OH by H.

16. Q16.

    Give an example of the insecticides on the basis of the targeted organism of the following: (a) Herbicides (b) Fungicides

17. Q17.

    The use of digital devices and technologies such as mobile phones and laptops is increasing in our daily lives. In this scenario, write two positive and two negative impacts of digital technology.

18. Q18.

    Black-eyed offspring were born from a black-eyed father and a brown-eyed mother. Why did the offspring have black eyes but not brown in the first generation? Show the filial chart of this process up to the second generation. Write down the genotypic ratio of the second generation.

19. Q19.

    External structure of the heart is shown in the given diagram: (a) In which part of the heart shown in the figure is the stent kept during angioplasty? (b) Which part carries blood from the heart to the lungs? (c) Which valve remains closed while part 'C' contracts? (d) Write the function of part 'E'.

20. Q20.

    (a) A stone is dropped from a tall tower that reaches the ground after 4 s. Calculate the velocity with which the stone lands on the ground. (b) Calculate the force of gravitational attraction between the two bodies shown in the diagram (4,500 kg and 2,000 kg, 500 km apart).

21. Q21.

    A student sitting at the back of his class has difficulty in reading the letters on the whiteboard placed on the front wall of the classroom, but he can read his book easily. (a) What type of defect of vision is he suffering from? (b) Draw ray diagrams to show the defect of his vision and the remedy of the problem. (c) Write one cause of this defect of vision.

22. Q22.

    Study the part of the periodic table given below and answer the following questions: (a) Write the very active metal and non-metal from the table. (b) Which one is more active between A and B, and why? (c) Among the elements shown in the table, write down the balanced chemical equation of the reaction between the very active metal and very active non-metal.

23. Q23.

    Study the given diagram and answer the following questions. (a) Which gas is collected in the gas jar? (b) Why is the gas jar kept erect? (c) Write down the balanced chemical equation of the reaction that takes place when a burning magnesium ribbon is kept inside the gas jar. (d) Write the balanced chemical equation of the process of formation of urea from the gas collected in the gas jar.

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