SEE 2081 Science Madesh Province Solution
Complete solutions for the Madesh Province Science Exam (RE-1041'MP')
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Section A: Multiple Choice Questions
Choose the best alternative to the following questions and write in the answer sheet: 10×1=10
1(a) In which of the following activities uses digital signal?
(i) speaking through a loudspeaker
(ii) face to face chatting together
(iii) chatting in internet
(iv) watching antenna TV
Answer: chatting in internet
1(b) Which of the following plants belongs to the division algae?
(i) Pea
(ii) Moss
(iii) Spirogyra
(iv) Cycas
Answer: Spirogyra
1(c) Which of the following kingdoms have cell walls in cells?
(i) Monera, Fungi, Animalia
(ii) Plantae, Protista, Animalia
(iii) Fungi, Plantae
(iv) Monera, Plantae, Protista
Answer: Fungi, Plantae
1(d) Nowadays, agricultural production has been affected by low rainfall at times and heavy 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
Answer: climate change
1(e) If the mass and radius of a heavenly object are four times greater than that of the earth, what is the value of acceleration due to gravity of that object?
(i) 1.22 m/s²
(ii) 2.45 m/s²
(iii) 4.9 m/s²
(iv) 9.8 m/s²
Answer: 2.45 m/s²
1(f) When aluminum foil is placed on water in a beaker, it floats. When the same piece of foil is squeezed into a spherical shape, it sinks. What could be the reason for this?
(i) The surface area decreases, upthrust decreases and sinks.
(ii) Weight increases and sinks.
(iii) Surface area increases and sinks.
(iv) Density of foil increases and sinks.
Answer: The surface area decreases, upthrust decreases and sinks.
1(g) In the process of formation of a rainbow, which of the following is the correct order of speed of light? The speed of green, violet, and red colored rays of light is represented by V₁, V₂, and V₃ respectively.
(i) V₁ > V₂ > V₃
(ii) V₁ > V₂ < V₃
(iii) V₁ < V₃ < V₂
(iv) V₁ > V₃ < V₂
Answer: V₁ > V₂ > V₃
1(h) Under what condition can a closed-universe be hypothesized?
(i) When average density is greater than the critical density.
(ii) When average density is less than the critical density.
(iii) When average density and critical density are equal.
(iv) When average density and critical density are not comparable.
Answer: When average density is greater than the critical density.
1(i) Which of the following is the effect of heat on the rate of chemical reaction?
(i) The kinetic energy of particles increases when heat increases and particles come in contact faster.
(ii) The chemical reactivity decreases when heat increases.
(iii) There is no relationship between heat and chemical reactivity.
(iv) Rate of chemical reaction increases because the concentration of matter increases when heat increases.
Answer: The kinetic energy of particles increases when heat increases and particles come in contact faster.
1(j) A statement and two arguments are given below.
Statement: Detergent is called a soapless soap.
Argument 1: It has cleaning properties like soap but chemical properties are different.
Argument 2: Soap does not cause chemical pollution but detergent does.
(i) Statement and argument 1 are correct but argument 2 is incorrect.
(ii) Statement and argument 1 are incorrect but argument 2 is correct.
(iii) Statement and argument 2 are incorrect but argument 1 is correct.
(iv) Statement and argument 2 are correct but argument 1 is incorrect.
Answer: Statement and argument 1 are correct but argument 2 is incorrect.
Section B: Very Short Answer Questions
Write very short answers to the following questions: 9×1=9
2(a) What is a dependent variable in a process of throwing a stone with a stretched rubber band?
2(b) Define one Pascal pressure.
2(c) Draw a diagram that shows refraction of light.
2(d) According to Hubble's law, on what factor does the speed of a star depend?
2(e) Complete the given ray diagram.
[Diagram: 2F F]
2(f) Write a difference between roasting and calcination.
2(g) Arrange the metals sodium, aluminium, and magnesium in ascending order of their reactivity.
2(h) Write an application of hydrocarbon in daily life.
[Given: OH OH OH H H H]
2(i) Draw a graph to show the relationship of alternating current and time.
Section C: Short Answer Questions
Write short answers to the following questions: 14×2=28
3. Prove that the fundamental units of power are kgm²/s².
4. Write any two main features of aves.
5. Study the concept map and write the function of Y and Z.
[X → Parthenogenesis → Bee → Fertilization → Fertile, Sterile → Y, Z]
6. Write any two differences between mitosis and meiosis cell division.
7. Show in a chart the result of a cross between pure long (LL) winged drosophila and pure short (ll) winged drosophila up to the second filial generation.
8. How is open heart surgery done? Describe in brief.
9. Nowadays, mountains are turning into black rock due to the melting of snow. How can we control this process? Write any two ways.
10. Write any two conditions for an object to be weightless.
11. Calculate the gravitational force of attraction between objects A and B as shown in the given figure.
[Diagram: 2,000 Kg (A) --- 80 Km --- 4,000 Kg (B)]
12. Draw a neat diagram of the laboratory preparation of ammonia gas.
13. Write a formula equation of a chemical reaction that takes place in the presence of light, and balance the equation.
14. Write the name of the member of alkyne that contains an equal number of hydrogen and carbon. Write its structural formula.
15. Excessive use of insecticides has started causing serious problems in human health. Give two suggestions to mitigate such problems.
16. Write a balanced chemical equation of the reaction of two gases having molecular weights of 17 a.m.u. and 44 a.m.u.
Section D: Long Answer Questions
Write long answers to the following questions: 7×4=28
17. Mention any four ways of gaining digital well-being.
18. Write any two advantages and two disadvantages of artificial fertilization.
19. 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. What type of blood group is called A-positive, and what type is called O-negative blood group?
| Student | Antigen | Blood Clot |
|---|---|---|
| A | A | Seen |
| B | Unseen | |
| D | Seen | |
| B | A | Unseen |
| B | Seen | |
| D | Seen |
20. Three liquids 'X', 'Y', and 'Z' of equal mass are kept in the same type of container and placed in the sun for an equal time. The increase in temperature is given in the table.
| Liquid | Increase in Temperature |
|---|---|
| X | 30°C |
| Y | 35°C |
| Z | 28°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. Study the given diagram and answer the following questions:
[Diagram: Retina with defect]
a) Write any two causes of such a defect.
b) What type of lens is used to remove the defect of the vision shown in the given figure? Why?
22. A transformer in a powerhouse has a 1:80 ratio of primary and secondary coils. If 400 V is passed into the primary coil, what could be the voltage produced in the secondary coil? Can this transformer be used in a domestic circuit? Give one reason.
23. A part of the periodic table is shown below in which some hypothetical symbols are used to represent real elements. Study the table and answer the following questions:
| Period | IA | IIA | IIIA | IVA | VA | VIA | VIIA | 0 |
|---|---|---|---|---|---|---|---|---|
| n=2 | c | b | Ne | |||||
| n=3 | a | d |
i) Write the electronic configuration of element 'a' on the basis of sub-shell.
ii) Element 'c' is more reactive than 'b', why?
iii) Atomic size of 'a' is greater than element 'd', why?
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