CBSE Board Sample Paper
Subject - Science
Class - 10th
Instructions :
I. This question paper is divided into two sections A and B.
II. All questions are compulsory.
III. Q. No. 1 to 5 in section A are 1 mark questions.
IV. Q. No. 6 to 10 are 2 mark questions.
V. Q. No. 11 to 15 are 3 mark questions
VI. Q. No. 16 & 17 are 5 mark questions.
1. A mirror and thin lens each have f= -25cm. The mirror and lens are
(a). Both concave (b). Mirror concave , lens convex (c). Mirror convex , lens concave (d). Both convex
2. The image formed is always erect. The mirror is
A. Plane, B. Concave C. Convex D. Plane or convex
3. The amount of energy when a neutral gaseous atom gain one electron is called
(a) Ionisation energy (b) electron affinity (c) ionization potential (d) bond energy
4. The element having similar properties are placed in same
(a)period (b) group (c) both (d) none of these
5. What is valence electron of last element in 3rd period?
(a)1 (b)5 (c)8 (d)o
6. Give any 5 characteristics of image formed by a plane mirror.
7. What is refractive index of a medium? If refractive index of glass is 1.6 and refractive index of diamond is 2.4. What is the refractive index of diamond with respect to glass?
8. What are rod shaped and cone shaped cells? How do they help us in seeing colors?
9. What is the difference between virtual image produced by concave, plane and convex mirrors?
10. Write differences between Mendleev’s nad Modern periodic table.
11. Why mixture of water and alcohol used instead of water only in radiators?
12. Give two differences between soap and synthetic detergent.
13. What are the uses of a concave mirror?
14. A doctor has prescribed a corrective lens of power + 1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
15. Why does an ink dot appear to be raised when viewed through a glass slab? [given aµg = 3/2]
16. An object is placed at a distance of 10cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.
17. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10cm. Draw the ray diagram and find the position, size and nature of the image formed.