SEE 2082 Sudurpashchim Province — Science Past Paper
- Q1.
Choose the best alternative of the following questions and write the answer in the answer-sheet.
- (a) Which of the following uses an analogue signal? (i) Infra-red thermometer (ii) Computer (iii) Smart watch (iv) Short wave radio receiver
- (b) The following table shows four groups of animals. To which group does a fish belong? (i) W (ii) X (iii) Y (iv) Z
- (c) Choose the correct conclusion based on the given fact and statements. Fact: Climate change refers to long-term variations in temperature and precipitation patterns. Statement 1: This can lead to rising sea levels due to melting of ice. Statement 2: It makes the Earth move farther away from the Sun every year. (i) Fact and both statements are correct. (ii) Fact is incorrect but both statements are correct. (iii) Fact and statement 1 are correct but statement 2 is incorrect. (iv) Fact and statement 2 are correct but statement 1 is incorrect.
- (d) Which of the following statements is correct? (i) Value of acceleration due to gravity decreases when we go higher from the surface of the Earth. (ii) Value of acceleration due to gravity decreases when the height increases from the surface of the Earth. (iii) Value of acceleration due to gravity is less at the polar regions than at the equatorial region of the Earth. (iv) Value of acceleration due to gravity is the most at the highest peak of the Earth.
- (e) In the given figure, what is the weight of the object in the liquid? (i) 5 N (ii) 25 N (iii) 30 N (iv) 35 N (Refer to the diagram in the original question paper.)
- (f) Study the given diagram and identify p and q. (i) p - angle of refraction and q - critical angle (ii) p - critical angle and q - angle of reflection (iii) p - angle of incidence and q - angle of refraction (iv) p - critical angle and q - angle of refraction (Refer to the diagram in the original question paper.)
- (g) According to Aufbau's principle, which of the following sequences is correct? (i) 2s, 2p, 3p, 4s (ii) 2p, 3s, 3p, 4s (iii) 2p, 3s, 4s, 3p (iv) 1s, 2p, 2s, 3s
- (h) Which of the following equations is correct for the reaction while burning magnesium with nitrogen?
- (i) Which of the following is the main ore of iron? (i) Argentite (ii) Chalcopyrite (iii) Siderite (iv) Haematite
- (j) Study the statement and arguments about soap. Statement: Soap is environment friendly. Argument 1: Soap is biodegradable, hence does not pollute the environment. Argument 2: Soap gives scum in hard water and makes clothes and utensils clean. (i) Statement and argument 1 are wrong but argument 2 is correct. (ii) Statement and argument 2 are correct but argument 1 is wrong. (iii) Statement and argument 2 are wrong but argument 1 is correct. (iv) Statement and argument 1 are correct but argument 2 is wrong.
- Q2.
Write very short answers to the following questions.
- (a) Why is the controlled variable kept unchanged in a scientific experiment?
- (b) Bat and whale have many dissimilarities, yet they are kept in the same class. Why?
- (c) What is the weight of a body on the Moon's surface if its weight is 150 N on the Earth's surface?
- (d) Define free fall.
- (e) State the law of pressure that can be verified by the given figure. (Refer to the diagram in the original question paper.)
- (f) Draw a graph to show the relationship between alternating current and time.
- (g) In which group of the modern periodic table does the element with electronic configuration 1s2, 2s2 2p6, 3s2 lie?
- (h) Why is magnetic separation used in metallurgy?
- (i) Write down the structural formula of glycerol.
- Q3.
Test the validity of power, P = W/t, by unit-wise analysis.
- Q4.
If you are given only the leaves of three plants belonging to the sub-divisions under Tracheophyta, is it possible to identify their sub-divisions? Give your logic.
- Q5.
Differentiate between a worker bee and a drone bee on the basis of one function and the time period of formation of their larvae.
- Q6.
What is artificial insemination? Why are farmers attracted towards artificial insemination rather than natural fertilization nowadays? Write any one reason.
- Q7.
A woman has given birth to four daughters consecutively, and she and her husband are in stress. She wants to explain to her family that this is simply a matter related to chromosomes. Show this with a suitable sex-determination chart.
- Q8.
Look at the table about 4 different blood vessels and answer the questions below:
- (a) Which one is the pulmonary artery?
- (b) Between P and R, which one is responsible for pulmonary circulation?
- Q9.
Write any two uses of the given organism. (Refer to the diagram in the original question paper.)
- Q10.
What happens to the gravitational force when the masses of two objects are kept constant and the distance between them is made half? Explain with a suitable equation.
- Q11.
A candle is kept 3 cm from a convex lens of focal length 2 cm. Draw the ray diagram to show the position of the image and state one nature of the image formed.
- Q12.
An astronomer studies two galaxies, P and Q, that are very far from each other, and finds that galaxy P is farther from the Earth than galaxy Q. Based on this information, answer the following.
- (a) Which galaxy has the greater recessional velocity?
- (b) Why are P and Q going away from each other?
- Q13.
Lithium, Sodium and Potassium belong to which group of the periodic table? Although these three elements are in the same group and have the same valency, their chemical reactivity differs. Why?
- Q14.
Write any two factors that affect the rate of a chemical reaction.
- Q15.
Write the structural formula of marsh gas. Write the IUPAC name of the compound formed when one 'H' of this hydrocarbon is replaced by one 'OH'.
- Q16.
Pickles last for months without refrigeration. Write one local food-preservation method used to preserve pickle, and one advantage of this method.
- Q17.
Students spend a significant amount of time using smartphones, computers and the internet for studying, social media and entertainment. Identify two positive and two negative effects of these technologies on their daily life.
- Q18.
Draw a clear, labelled diagram of the human heart and label the following parts:
- (a) Blood vessel that carries blood from the heart to the lungs.
- (b) The largest artery.
- (c) Chamber of the heart that collects deoxygenated blood.
- Q19.
A red-flowered and a white-flowered pea plant are cross-fertilized and the result is shown in the table (Punnett square).
- (a) To which filial generation does this result belong?
- (b) Write the phenotypic and genotypic ratio of red-flowered and white-flowered pea plants.
- (c) Write the genotype that represents a pure red-flowered pea plant.
- (d) RR and rr are also seen in the cross. Which law does this prove?
- Q20.
Study the given table of specific heat capacities and answer the questions.
- (a) If equal masses of these substances are heated to the same temperature and exposed to air, which one cools the fastest and why?
- (b) If the temperature of 20 kg of substance A is increased by 50 C, how much heat energy must be supplied?
- Q21.
The number of turns in the secondary coil of a transformer is 50 times that in the primary coil. If a 220 V input voltage is passed through this transformer, calculate the output voltage. Which type of transformer is this, and where is such a transformer used?
- Q22.
Study the given ray diagram.
- (a) Which process is shown in the given diagram?
- (b) What is the colour of rays A and B?
- (c) Which ray (A or B) has the greater speed in the glass medium?
- (d) Ray B bends more than ray A. What is the reason for this?
- Q23.
Study the given diagram.
- (a) Which gas is being collected in the gas jar?
- (b) What would happen if this gas were sent directly to the gas jar without passing through tower X?
- (c) Write the balanced chemical equation for the preparation of this gas in the laboratory.
Open each question on Ujyalo to see the full model answer, marking scheme and step-by-step working — free with an account.