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Class 10 CBSE 10th Board 2017 : French

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anu_bas
Chennai Public School (CPS), Thirumazhisai

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CBSE Sample Paper-01 (solved) SUMMATIVE ASSESSMENT II SCIENCE (Theory) Class X (Solutions) SECTION-A 1. 2. Carbon dioxide 3. 4. Grass Rabbit Snake Hawk f = +3 m, u = 5 m 5. 6. 7. 8. 1 1 1 = + f v u 1 1 1 1 1 8 = = + = v 3 ( 5) 3 5 15 1 1 1 = v f u v= 15 = 1.875 m = 1.9 m 8 v is positive. Image is therefore virtual. Light should move from denser to rarer medium and the incident angle should be more than critical angle. Examples: (a) Fibre optic communication, (b) Totally reflecting prism It is due to increase in number of protons and electrons successively in the same shell due to which force of attraction between valence electrons and nucleus increases, therefore atomic size decreases. Near point of hypermetropic person is 75 cm. So focusing for objects closer than 75 cm is not possible. The person is far-sighted and so can be corrected by convex lens of proper focal length. u = 25 cm, v = 75 cm 1 1 1 1 1 1 1 + 3 2 Using = , we get = + = = f v u f 75 25 75 75 75 =37.5 cm f = 2 200 Power of lens = P = = 2.67 D 75 (a) With age, the power of accommodation of our eye decreases. Generally the near point moves away. This makes the person not to read clearly, the nearby objects. This defect is called Presbyopia. Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks

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