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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

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