SEE 2079 Bagmati Province — Science Past Paper
- Q1.
Group 'A' Write short answers to the following questions. [15 x 1 = 15]
- (a) Among bio-fuel, geothermal energy, tidal energy and fossil fuel, which one is a non-renewable source of energy?
- (b) Why do mountaineers use an alcohol thermometer?
- (c) What is the electrical device called that converts kinetic energy into electrical energy?
- (d) Write the name of a chief ore of iron.
- (e) Write the name of the chemical fertilizer formed by the reaction between carbon dioxide and ammonia gas.
- (f) What are the raw materials used to manufacture cement?
- (g) How many times does a silkworm moult?
- (h) Which gland controls the functions of the other glands?
- (i) Among neutrophil, eosinophil, basophil and lymphocyte, which one is a non-granular leucocyte?
- (j) What is the number of pairs of diploid chromosomes in human beings?
- (k) If 'm' is mass and 'w' is weight, write down the relation between 'm' and 'w'.
- (l) Define the power of a lens.
- (m) Write the IUPAC name of C2H5OH.
- (n) Why do living beings reproduce?
- (o) Define meteorite.
- Q2.
Group 'B' 2. Write any two differences between the universal gravitational constant and the acceleration due to gravity.
- Q3.
Identify the source of energy that can be obtained from the fast-moving air in a hilly region. Write a use of this source of energy to minimise the energy crisis.
- Q4.
The specific heat capacities of some substances are given in the table. Substance X: 129 J/kg degree C Substance Y: 400 J/kg degree C Substance Z: 910 J/kg degree C
- (a) What does it indicate that the specific heat capacity of substance 'Y' is 400 J/kg degree C?
- (b) If equal heat is given to all the substances of equal mass, which one will have the lowest temperature?
- Q5.
Copy the given diagram into your answer sheet and complete it. Write any one nature of the image formed.
- Q6.
H2CO3 and H2SO4 are both acids, and each molecule has two hydrogen atoms. To prepare hydrogen gas by reaction with zinc, it is better to use dilute H2SO4 than dilute H2CO3. Why? Also write the chemical equation.
- Q7.
Study the given figure and answer the following questions.
- (a) Show, by a balanced chemical equation, the reaction that takes place when Ca(HCO3)2 is used instead of limestone.
- (b) How can we demonstrate that the gas formed in this reaction contains carbon?
- Q8.
The structural formulae of some compounds are given below.
- (a) Which one of them is an unsaturated hydrocarbon?
- (b) Write one use of 'C'.
- Q9.
Write the raw materials needed to prepare the following industrial chemicals.
- (a) The plastic used to make the handle of a pressure cooker.
- (b) The glass used to make lenses.
- Q10.
Write any two differences between a hormone and an enzyme.
- Q11.
Which blood cell is responsible for clotting blood? What is the number of this blood cell in a normal adult? Which disease is caused by its deficiency?
- Q12.
"Vegetative propagation is advantageous for gardens." Justify this statement with two points.
- Q13.
Sketch the life cycle of a honey bee and label its different stages. (Refer to the original diagram.)
- Q14.
Write any two differences between the Mesozoic Era and the Cenozoic Era.
- Q15.
Group 'C' 15. A solid object is fully immersed, one after another, in three different liquid media (water, salt solution and mercury) turn by turn. The mass of liquid displaced is given in the table. Liquid A: displaced mass = 1 kg Liquid B: displaced mass = 13.6 kg Liquid C: displaced mass = 1.5 kg
- (a) Identify the mercury among them.
- (b) If each liquid has the same volume and is kept in the same kind of container, the displaced volume of which liquid is the greatest? Give the reason on the basis of Archimedes' principle.
- Q16.
While teaching about the energy crisis, a teacher presented the world's energy consumption using the information below. Mineral oil: 35% Coal: 27% Biomass: 13% Hydroelectricity: 5% Nuclear fuel: 3% Natural gas: 17%
- (a) How does this table indicate that an energy crisis may occur in the future?
- (b) In the context of Nepal, which of the given sources can be produced and consumed more? Write with a reason.
- Q17.
Study the given chemical equations and answer the questions. (A) CaCO3 --Heat--> CaO + CO2 (B) Zn + H2SO4 -> ZnSO4 + H2 + heat (C) CaO + H2O -> Ca(OH)2 + heat
- (a) Identify the endothermic reaction from the above equations.
- (b) Which of the above equations is a displacement reaction?
- (c) What will happen if CaCO3 powder is used instead of pieces (lumps) of it?
- Q18.
The electronic configurations of some elements are given in the table. Element X: 1s2 2s2 2p6 3s1 Element Y: 1s2 2s2 2p6 3s2 3p5 Element Z: 1s2 2s2 2p6 3s2 3p6 4s2 3d6
- (a) Which compound is formed by 'Y' and 'Z'?
- (b) Write the molecular formula of the compound formed by 'Y' and the element that is just to the right of 'X' in the modern periodic table.
- (c) Write any one biological importance of 'Z'.
- Q19.
The following offsprings are obtained when a hybrid black dog and pure brown dog were crossed for the first filial generation:
- (a) Write the genotype of the parent dog that cannot produce a pure black dog.
- (b) What types of offspring would appear in the first generation if a pure black dog were crossed with a pure brown dog instead of a hybrid black one?
- (c) Why do no brown dogs appear in this second cross (condition b)?
- Q20.
A woman has poorly developed breasts and is unable to reproduce. Likewise, a man has larger-than-normal breasts and is also unable to reproduce. Answer the following questions.
- (a) Which type of chromosome caused this disorder?
- (b) Name the chromosomal disorder seen in the man.
- (c) Write the chromosome pattern found in the woman.
- Q21.
Group 'D' 21. A transformer is shown in the diagram. Study it and answer the following questions. (Refer to the original diagram.)
- (a) Clarify the reason why the primary and secondary coils of this transformer do not have the same number of turns.
- (b) What will the output be if a 3 V D.C. is passed into the primary coil of this transformer?
- (c) If the number of turns in the secondary coil is 1/5th of the number of turns in the primary coil, how much input voltage should be supplied to get a 12 V output?
- Q22.
- (a) Both sodium and magnesium are active metals. An alkali can be prepared by reacting water with sodium, but not with magnesium. Why?
- (b) What are two reasons that magnesium and calcium have a similar capacity for chemical reaction?
- (c) What is the main reason for placing magnesium between beryllium and calcium in the group?
- Q23.
The increasing urbanisation of Kathmandu has led to the setting up of many plastic and brick industries, and the smoke from them has increased air pollution. Answer the following questions.
- (a) In recent years the pH of rainwater has been found to be less than 4. Explain the cause.
- (b) Landing planes at Tribhuvan International Airport has become difficult because of poor visibility. What is the main cause of this poor visibility, and suggest one way to reduce the problem.
- Q24.
According to scientific facts, the temperature of the Earth is rising day by day, eye and skin diseases in humans are increasing, and reproductive problems in animals are also increasing. Answer the following questions.
- (a) What are the probable reasons for these problems? Write any one reason.
- (b) What is the main man-made chemical that causes such problems?
- (c) Show, by a chemical equation, the effect caused by this chemical in the Earth's atmosphere.
- (d) Write one other effect on the Earth that can be caused by the above problems.
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