CBSE Class 10 SA 2 Science paper of 2017 board based exam is available for download. With this article, students can download the complete question paper in PDF format. CBSE Class 10 Science 2017 board exam was held on 22 March 2017.
Watch video to know the reactions of CBSE school teachers and students about CBSE Class 10th SA 2 Science Paper 2017.
General Instructions for CBSE 10th SA 2 Science Paper
(i). The question paper comprises two sections, A and B. You are to attempt both the sections.
(ii). All questions are compulsory.
(iii). There is no choice in any of the question.
(iv). All questions of Section-A and B are to be attempted separately.
(v). Question numbers 1 to 3 in Section-A are one mark question. They are to be answered in one word or in one sentence.
(vi). Question numbers 4 to 6 in Section- A are two marks questions. These are to be answered in 30 words each.
(vii). Question numbers 7 to 18 in Section-A are three marks questions. These are to be answered in about 50 words each.
(viii). Question numbers 19 to 24 in Section-A are 5 marks questions. These are to be answered in 70 words each.
(ix). Question numbers 25 to 33 in Section- B are multiple choice questions based on practical skills.
Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
(x). Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief.
Some randomly selected questions from the question paper are:
Q. Write the molecular formula of the 2nd and the 3rd member of the homologous series whose first member is methane.
Q. An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
Q. Write the structural formula of ethanol. What happens when it is heated with excess of conc. H2SO4 at 443 K? Write the chemical equation for the reaction stating the role of conc. H2SO4 in this reaction.
Q. Write the number of periods and groups in the Modern Periodic Table. How does the metallic character of elements vary on moving (i) from left to right in a period, and (ii) down a group? Give reason to justify your answer.
Q. What is vegetative propagation? State two advantages and two disadvantages of this method.
Q. List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?
Q. If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system ?
Q. (a) Water is an elixir of life, a very important natural resource. Your Science teacher wants you to prepare a plan for a formative assessment activity, "How to save water, the vital natural resource". Write any two ways that you will suggest to bring awareness in your neighbourhood, on 'how to save water'.
(b) Name and explain any one way by which the underground water table does not go down further.
Q. (a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why.
(b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of a spherical mirror whose radius of curvature is +24 cm.
Q. A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain
(i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes.
(ii) the type of the corrective lens used to restore proper vision and how this defect is corrected by the use of this lens.
(b) If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention.
Q. A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens
(A) away from the screen
(B) towards the screen
(C) to a position very far away from the screen
(D) either towards or away from the screen depending upon the position of the object
Q. Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction.
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