SEE 2081 Madhesh 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) In which of the following activities is a digital signal used? (i) Speaking through a loudspeaker (ii) Face-to-face chatting together (iii) Chatting on the internet (iv) Watching antenna TV
   • (b) Which of the following plants belongs to the division algae? (i) Pea (ii) Moss (iii) Spirogyra (iv) Cycas
   • (c) Which of the following groups of kingdoms have a cell wall in their cells? (i) Monera, Fungi, Animalia (ii) Plantae, Protista, Animalia (iii) Fungi, Plantae, Animalia (iv) Fungi, Plantae, Monera
   • (d) These days, agricultural production has been affected by too little rainfall at some times and too much rainfall at other times. Which of the following is the main reason for this? (i) Volcanic eruption (ii) Flood and landslide (iii) Climate change (iv) Decrease in endangered animals
   • (e) If the mass and the radius of a heavenly body are each four times greater than those of the Earth, what is the value of the acceleration due to gravity on that body? (i) 1.22 m/s^2 (ii) 2.45 m/s^2 (iii) 4.9 m/s^2 (iv) 9.8 m/s^2
   • (f) A piece of aluminium foil floats when placed flat on water in a beaker, but the same foil sinks when it is squeezed into a ball. What is the reason for this? (i) The surface area decreases, so the up-thrust decreases and it sinks (ii) The weight increases and it sinks (iii) The surface area increases and it sinks (iv) The density of the foil increases and it sinks
   • (g) In the formation of a rainbow, the speeds of the green, violet and red coloured rays of light are represented by V1, V2 and V3 respectively. Which of the following is the correct order of these speeds? (i) V1 > V2 > V3 (ii) V1 > V2 < V3 (iii) V1 < V3 < V2 (iv) V1 > V3 < V2
   • (h) Under what condition can a closed universe be hypothesized? (i) When the average density is greater than the critical density (ii) When the average density is less than the critical density (iii) When the average density and the critical density are equal (iv) When the average density and the critical density are not comparable
   • (i) Which of the following is the effect of heat on the rate of a chemical reaction? (i) When heat increases, the kinetic energy of the particles increases and the particles come into contact faster (ii) When heat increases, the chemical reactivity decreases (iii) There is no relationship between heat and chemical reactivity (iv) When heat increases, the concentration of matter increases, so the rate of reaction increases
   • (j) A statement and two arguments are given below. Statement: Detergent is called a soapless soap. Argument 1: It cleans things like soap, but its chemical properties are different. Argument 2: Soap does not cause chemical pollution, but detergent does. (i) The statement and argument 1 are correct, but argument 2 is incorrect (ii) The statement and argument 1 are incorrect, but argument 2 is correct (iii) The statement and argument 2 are incorrect, but argument 1 is correct (iv) The statement and argument 2 are correct, but argument 1 is incorrect
2. Q2.

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

   • (a) What is the dependent variable in the process of throwing a stone with a stretched rubber band?
   • (b) Define one pascal of pressure.
   • (c) Draw a diagram that shows refraction of light.
   • (d) According to Hubble's law, on what factor does the speed of a star (galaxy) depend?
   • (e) Complete the given ray diagram.
   • (f) Write a difference between roasting and calcination.
   • (g) Arrange the metals sodium, aluminium and magnesium in ascending order of their reactivity.
   • (h) Write one application of the given hydrocarbon in daily life.
   • (i) Draw a graph to show the relationship between alternating current and time.
3. Q3.

   Group 'C' Write short answers to the following questions. [14 x 2 = 28] 3. Prove that the fundamental unit of power is kg.m^2/s^3.

4. Q4.

   Write any two main features of aves.

5. Q5.

   Study the given concept map and write the function of Y and Z.

6. Q6.

   Write any two differences between mitosis and meiosis cell division.

7. Q7.

   Show in a chart the result of a cross between pure long-winged (LL) drosophila and pure short-winged (ll) drosophila up to the second filial generation.

8. Q8.

   How is open-heart surgery done? Describe in brief.

9. Q9.

   These days the snow of the Himalayan region is melting and the mountains are turning into bare black rock. How can this process be controlled? Write any two ways.

10. Q10.

    Write any two conditions for an object to be weightless.

11. Q11.

    Calculate the gravitational force of attraction between objects A and B shown in the given figure. (A = 2000 kg, B = 4000 kg, distance between them = 80 km; refer to the original figure.)

12. Q12.

    Draw a neat diagram of the laboratory preparation of ammonia gas.

13. Q13.

    Write a formula (chemical) equation of a reaction that takes place in the presence of light, and balance the equation.

14. Q14.

    Write the name of the member of the alkyne series that contains an equal number of carbon and hydrogen atoms, and write its structural formula.

15. Q15.

    The excessive use of chemical insecticides has begun to cause serious problems for human health. Write any two suggestions to reduce such problems.

16. Q16.

    Write the balanced chemical equation for the reaction between two gases having molecular masses of 17 a.m.u. and 44 a.m.u.

17. Q17.

    Group 'D' Write long answers to the following questions. [7 x 4 = 28] 17. Mention any four ways of achieving digital well-being.

18. Q18.

    Write any two advantages and two disadvantages of artificial fertilisation.

19. Q19.

    The results of the blood-group test of two students are shown in the table. Identify the blood group of student A and student B. Also state which blood is called A-positive and which is called O-negative.

20. Q20.

    Three liquids X, Y and Z of equal mass are kept in identical containers and placed in the sun for an equal time. The rise in their temperature is given below. Study it and answer the following questions. Liquid X: temperature rise = 30 degree C Liquid Y: temperature rise = 35 degree C Liquid Z: temperature rise = 28 degree C

    • (i) Among them, which liquid has the highest specific heat capacity? Why?
    • (ii) If equal masses of all three liquids, at the same temperature, are cooled, which one will cool down faster? Why?
21. Q21.

    Study the given diagram of and answer the following questions.

    • (a) Write any two causes of this defect of vision.
    • (b) What type of lens is used to remove the defect of vision shown in the figure? Why?
22. Q22.

    A transformer in a power house has its primary and secondary coils in the ratio 1 : 80. If 400 V is supplied to the primary coil, what voltage is produced in the secondary coil? Can this transformer be used in a domestic circuit? Give one reason.

23. Q23.

    A part of the periodic table is shown below, in which some real elements are represented by hypothetical symbols. Study it and answer the following questions.

    • (i) Write the electronic configuration of element 'a' on the basis of sub-shells.
    • (ii) Element 'c' is more reactive than element 'b'. Why?
    • (iii) The atomic size of element 'a' is greater than that of element 'd'. Why?

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