SEE 2079 Madhesh Province — Science Past Paper
- Q1.
Group 'A' Write short answers to the following questions. [15 x 1 = 15]
- (a) How many joules of heat energy are there in 1 calorie?
- (b) Which part of the eye plays a role in the accommodation of the eye?
- (c) Write one of the ways to increase the magnitude of the induced e.m.f. in a generator.
- (d) Between K and Na, which one is more reactive?
- (e) What are the components of carbogen?
- (f) What is the name of the group of hydrocarbons with the general formula CnH2n?
- (g) What is the name of the gland which produces both an enzyme and a hormone?
- (h) Write the karyotype (chromosome pattern) of Klinefelter's syndrome.
- (i) Why did Mendel select the pea plant for his experiment? Write any one point.
- (j) Write one of the bases for the division of the layers of the atmosphere.
- (k) It is easier to lift a stone in water than in air. Why?
- (l) Write any one reason for the extreme use of mineral oil, although it is a non-renewable source of energy.
- (m) Write the name of the chief ore of aluminium.
- (n) What is the main food of the seri silk worm?
- (o) Which gas is produced from domestic waste?
- Q2.
Group 'B' 2. Write any two factors that affect liquid pressure.
- Q3.
Write any two differences between nuclear fission and nuclear fusion.
- Q4.
Write any two differences between a clinical thermometer and a laboratory thermometer.
- Q5.
Nichrome wire is used in a heater. Why? Write any two reasons.
- Q6.
Mention any one reason why powdered limestone reacts faster than pieces of limestone with hydrochloric acid. Also express the reaction as a balanced chemical equation.
- Q7.
A gas is prepared in the laboratory by heating ammonium chloride and calcium hydroxide. Answer the following questions.
- (a) What is the ratio of calcium hydroxide to ammonium chloride used in this process?
- (b) Write the balanced chemical equation for this process.
- Q8.
Give reasons for the following.
- (a) Metals like gold and silver are used to make jewellery.
- (b) Copper and iron utensils are not used to cook acidic substances.
- Q9.
Give reasons for the following.
- (a) PVC cannot be used in the handles of a pressure cooker.
- (b) Melamine cannot be remoulded.
- Q10.
The given figure is the larva stage of a silkworm. (Parts B, C and D are labelled. Refer to the original diagram.) Answer the following questions.
- (a) Which part of it helps in respiration?
- (b) Write the function of Part C.
- Q11.
Write any two reasons why Down's syndrome occurs in both boys and girls.
- Q12.
Write any two differences between variation and mutation.
- Q13.
"Soil is polluted by increased industrialization and urbanization." Clarify this statement with any two reasons.
- Q14.
Suppose there are four Eras A, B, C and D. In Era A human beings became dominant, in Era B flowering plants evolved, in Era C insects and fishes evolved, and in Era D unicellular organisms originated and developed. Answer the following questions.
- (a) Write the name of Era A.
- (b) Which of the above Eras is considered the Era of reptiles?
- Q15.
Group 'C' 6x3=18 15. A mercury barometer reads 760 mm of Hg as the atmospheric pressure at sea level. If the barometer is filled with water instead, what height of water will rise inside the barometer at that place? Which of the two is better to use as a barometric liquid? Explain.
- Q16.
A student sitting on the last bench of the class found that the letters written on the instructional board appeared blurred. Answer the following questions.
- (a) What type of lens should be used in the spectacles to remedy this defect of vision?
- (b) Draw the ray diagram for the image formed while using these spectacles.
- Q17.
A metal A has 14 neutrons in its atom then. Answer the following questions.
- (a) Write the electronic configuration of that atom.
- (b) Construct the ionic structure of A3+ on the basis of its atomic structure.
- (c) Clarify the reason why this atom does not form A2+.
- Q18.
A saturated hydrocarbon is formed by the hydrogenation of an alkene that has 2 carbon atoms and the general formula CnH2n. One of the reactants in this reaction, when burnt in air, produces a gas that turns lime water milky. Answer the following questions.
- (a) Write the IUPAC names of the reactant and the product described in the first statement.
- (b) Write the balanced equation of the reaction in the first statement.
- (c) Write the name of the milky compound formed as described in the second statement.
- Q19.
Sketch a neat diagram of the Central Nervous System and label the following parts in it: (a) the part responsible for reflex action; (b) the part which is responsible for imagination.
- Q20.
Some parts of a flower are shown in the given diagram: Answer the following questions.
- (a) Where is part 'A' formed?
- (b) Which part of it forms the seed?
- (c) What is formed by the fusion of part C and the male gamete?
- Q21.
Group 'D' 21. The gravitational force between two masses, when they are separated by certain distances, is shown in the table (F = G m1 m2 / d^2). S.N. 1: force F, distance d, masses m1 and m2 S.N. 2: force F/2, distance 2d, masses 2m1 and 2m2 S.N. 3: force 4F, distance 2d, masses 2m1 and (1/2)m2 S.N. 4: force F/2, distance 2d, masses 2m1 and m2
- (a) With reference to serial 1, which of the serials are true?
- (b) If the value of F in serial 1 is 400 N, show by calculation the value of the force when the distance between the bodies is doubled, keeping their masses constant.
- Q22.
Hyperacidity occurs when the concentration of acid in the stomach becomes more than required. Answer the following questions.
- (a) Which of Ca(OH)2, Mg(OH)2 and Na2CO3 is suitable to neutralize the acid in this condition? Write with reason.
- (b) Write the balanced chemical equation for reducing the hyperacidity in the human stomach.
- Q23.
Blood circulation is shown in the given figure. A and D are organs of the human body, and B, C, E and F represent blood vessels.
- (a) What is the name of part B?
- (b) What is the function of D?
- (c) What type of blood flows in F?
- (d) What is the name of the blood circulation that occurs between the heart and part D?
- Q24.
A class 10 student was sitting outside with his father after dinner. Suddenly he saw a bright object falling from the sky towards the Earth. Answer the following questions.
- (a) Why does that object fall down?
- (b) How does it appear bright?
- (c) What is it called when that body reaches the Earth's surface?
- (d) What is the benefit of studying such objects?
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