SEE 2081 Lumbini Province — Science Past Paper

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

1. Q1.

   Group 'A' (Multiple Choice Questions) Choose the best alternative to the following questions and write it in the answer sheet. [10 x 1 = 10]

   • (a) Which of the following is an audio file format? (i) SVI (ii) WAV (iii) MOV (iv) 3GP
   • (b) Which nitrogen base is found only in the given figure? (i) Adenine (ii) Guanine (iii) Cytosine (iv) Thymine
   • (c) Which of the following is a feature of Aves (birds)? (i) Respire through gills (ii) Poikilothermic (iii) Viviparous (iv) Have a beak and feathers
   • (d) In the given figure, what is the up-thrust exerted by the liquid on the immersed body? (Weight in air = 50 N, weight when immersed = 15 N) (i) 65 N (ii) 50 N (iii) 35 N (iv) 15 N
   • (e) What is the speed of light in diamond? (i) 2.5 x 10^8 m/s (ii) 1.24 x 10^8 m/s (iii) 2.5 x 10^8 m/s (iv) 3 x 10^8 m/s
   • (f) For how long does a stone remain in the air when it is thrown upward with an initial velocity of 20 m/s? (i) 2 s (ii) 4 s (iii) 10 s (iv) 20 s
   • (g) If equal amounts of heat are supplied to equal masses of water and kerosene, which of the following facts is correct? (i) Kerosene has a higher temperature than water (ii) Both of them have the same temperature (iii) Kerosene has a lower temperature than water (iv) Heat does not affect the temperature
   • (h) If a current-carrying conductor is placed in a permanent magnetic field, the conductor vibrates. What is this effect called? (i) Magnetic effect (ii) Effect of electromagnetic induction (iii) Mutual induction effect (iv) Motor effect
   • (i) Which of the following is an ore of copper? (i) Chalcopyrite (CuFeS2) (ii) Argentite (Ag2S) (iii) Hematite (Fe2O3) (iv) Bauxite (Al2O3)
   • (j) A statement and two arguments are given below. Statement: An insecticide that accumulates in the environment is a type of insecticide. Argument 1: The insecticide does not degrade quickly in the environment. Argument 2: It degrades gradually when it comes in contact with air and water. (i) The statement and argument 2 are correct, but argument 1 is incorrect (ii) The statement and argument 2 are incorrect, but argument 1 is correct (iii) The statement and both arguments are correct (iv) The statement and both arguments are incorrect
2. Q2.

   Group 'B' Write very short answers to the following questions. [9 x 1 = 9]

   • (a) Write the fundamental units included in the unit of force.
   • (b) Write a similarity between aves and mammals.
   • (c) Which hybrid animal is produced by the cross between a zebra and a horse?
   • (d) Mention any one suggestion to preserve endangered animals.
   • (e) Write the name of an instrument based on Pascal's law.
   • (f) Mention one benefit of the anomalous expansion of water.
   • (g) Write the balanced chemical equation for the formation of the white powder produced when a magnesium ribbon is burnt.
   • (h) Write a difference between roasting and calcination.
   • (i) Write the IUPAC name of the given structural formula.
3. Q3.

   Group 'C' Write short answers to the following questions. [14 x 2 = 28] 3. What are the dependent variable and the independent variable involved when a piece of paper is thrown using a stretched rubber band?

4. Q4.

   Write any two differences between a rat and a snake on the basis of the structure of the heart and reproduction.

5. Q5.

   "The honey bee is a useful insect." Justify this statement with two points.

6. Q6.

   What type of offspring are produced by crossing a hybrid tall (Tt) plant with a pure tall (TT) plant? Show by a chart.

7. Q7.

   Write any two examples of non-granular leucocytes.

8. Q8.

   Mention any two suggestions for making maximum use of medicinal herbs at the local level.

9. Q9.

   What mass can be lifted by a person on the Moon if he can lift 100 kg on the Earth? Calculate.

10. Q10.

    Write any two effects of gravity.

11. Q11.

    Find the amount of heat needed to raise the temperature of 8 kg of water from 30 degree C to 48 degree C. (The specific heat capacity of water is 4200 J/kg degree C.)

12. Q12.

    Write any two conditions for total internal reflection of light.

13. Q13.

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

14. Q14.

    Write the chemical reaction that occurs between ammonium chloride and calcium hydroxide and balance it.

15. Q15.

    Write the IUPAC name and structural formula of the compound formed by substituting one hydrogen atom from each of the two carbon atoms of ethane with an -OH group.

16. Q16.

    Write any two precautions that should be taken while using pesticides on a farm.

17. Q17.

    Group 'D' Write long answers to the following questions. [7 x 4 = 28] 17. Write any two positive and two negative impacts of digital technology.

18. Q18.

    Study the electronic configurations of two elements A and B and answer the questions that follow. Element A = 1s2, 2s2 2p6, 3s2 3p6, 4s1 Element B = 1s2, 2s2 2p6, 3s2 3p5

    • (i) Which one of the given elements is a metal?
    • (ii) Write the period of element B on the basis of the modern periodic table.
    • (iii) Write the balanced chemical equation that occurs when element A combines with element B.
19. Q19.

    A student prepared a gas by using egg shells, because calcium carbonate was not available in the laboratory. Answer the following questions about that gas. (Egg shells are made of calcium carbonate.)

    • (i) Write the balanced chemical equation of the reaction when this gas is passed into lime water.
    • (ii) Write an application of this gas in the medical field.
    • (iii) Write the molecular formula of the compound formed when this gas reacts with a gas having a molecular mass of 17 a.m.u.
    • (iv) How is this gas tested?
20. Q20.

    A couple have only four sons. In such a case, does it mean the X chromosome is absent in the man's semen? Describe, with a chart, the role of chromosomes in the determination of sex in humans.

21. Q21.

    The lens used by a student has a power of -8 D. Find its focal length and its type, and mention two causes of this defect of vision.

22. Q22.

    Sketch a diagram of the internal structure of the heart and name the pulmonary valve and the bicuspid valve.

23. Q23.

    In a transformer the number of turns in the secondary coil is 10 times that in the primary coil. If the transformer is connected to a 230 V main line, how much secondary voltage is obtained? What type of transformer is this? Write one use of such a transformer.

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