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Class 10 CBSE 10th Board 2018 : Science

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Kishor Bisht
The Indian Public School, Dehradun
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Time: 90min MM- 40 The Indian Public School, Dehradun UNIT TEST 1-2017 Science/Class: X /21.08.2017 KSB, MKS,PTD- 38 -------------------------------------------------------------------------------------------------------------------All questions are compulsory. There are 16 questions in all Q1 The normal blood pressure in human being is (1) (i) 140/80 mm/Hg (ii) (100/60 mm/Hg (iii) 120/80mm/Hg (iv) 120/60mm/Hg Q2 Study the given ray diagram and select the correct statement from the following:[1] (i) Device X is a concave mirror and device Y is a convex lens, whose focal length are 20 cm and 25 cm respectively (ii) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 10 cm and 25 cm respectively. (iii) Device X is a concave lens and device Y is a convex mirror of focal lengths are 20 cm and 25 cm respectively. (iv) Device X is a convex lens and deviceY is a concave mirror, of focal lengths are 20 cm and 25 cm respectively. Q3 The process of respiration is : (a) An oxidation reaction which is endothermic . (b) A reduction reaction which is exothermic . (c) A combination reaction which is endothermic reaction. (d) An oxidation reaction which is exothermic. Q4 In the following diagram, the path of a ray of light passing through a glass prism is shown: [1] {1} In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option) (a) X ,R and T (b) Y ,Q and T (c) X, Q and P (d) Y, Q and P Q5 What is Aqua-regia? Which metal dissolve in aqua-resia . {1} 1 PTO Q6 How binary fission differs from multiple fission? Q7 (1) (a) What is the role of acid in our stomach? (b) What are the differences between autotrophic nutrition and heterotrophic nutrition? (2) Q8 Name the gland which is heterocrine in function. Explain it with examples. (2) Q9 (a) An object of height 2.5 cm is placed at a distance of 15 cm from the optical Centre O of a convex lens of focal length 10cm. Find the position and size of the image formed. Draw a ray diagram of the formation of image and mark optical Centre O , Principal focus F , and height of the image on the diagram. [3] Q10 (i) What are the differences between the transport of materials in xylem and phloem? (2) (ii) Why is DNA copying an essential part of reproduction? (1) Q11 Define the Ionic bond. Draw the dot structure for MgCl 2. {3} Q12 (a) Explain the following terms related to the spherical mirror: (a) Centre of curvature (b) Principal axis focus (c) Pole [2] (d) Principal (b) 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? [1] Q13 Explain the term Rancidity . Give four ways to prevent the rancidity. {3} Q14 (a) What do you mean by reflex action? Explain with examples. (b)Name the structural and functional unit of nervous system? Explain the functions of its parts. Draw a neat labelled diagram also. (5) Q15 A student is suffering from myopia is not able to see distinctly the object placed beyond 5m. [5] (a) List two possible reason due to which this defect of vision may have arisen. (b) With the help of ray diagram explain :- (i) why the student is unable to see distinctly the object placed beyond 5m from his eyes. (ii) The type of corrective lens used to restore a proper vision and how this defect is corrected by the use of this lens. (c) If in this case, the numerical value of focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention. Q16 (a) Define the term with example (i) Roasting (ii) Calcination {2} (b)The reaction of X with Fe2O3 is highly exothermic used to join Railways Tracks . Identify The metal x . write the chemical equation, also give the name of equation. {3} 2

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