CBSE Board Sample Paper
Subject - Science
Class - 10th
Instructions :
I. All questions are compulsory.
II. Q. No. 1 to 5 are 1 mark questions.
III. Q. No. 6 to 10 are 2 mark questions.
IV. Q. No. 11 to 15 are 3 mark questions
V. Q. No. 16 & 17 are 5 mark questions.
1. functional group mainly determines the
a. physical properties b. chemical properties c. both d. none of these
2. The number of covalent bonds in C4H10 is
a. 10 b. 8 c. 13 d. 12
3. Laws of reflection are applicable to:
(a) Spherical reflecting surfaces (b) Plane reflecting surfaces
(c) All types of reflecting surfaces (d) Spherical and plane reflecting surfaces
4. Light travels faster in
a. Vacuum b. Glass c. Air d. Diamond
5. How metallic character changes in period from left to right?
a. increases b. decreases c. increases and than decreases d. no effect
6. What is the IUPAC name of , CH3CH2CH═CH2 and CH3CHO.
7. What happens when a small piece of sodium is dropped into ethanol?
8. A concave mirror and a concave lens are held in water. What changes, if any, do you expect in their focal length?
9. Calculate the distance at which an object should be placed in front of a thin convex lens of focal length 10 cm to obtain the virtual image of Double size?
10. What type of a mirror is used as a reflector in street lamps? Why?
11. Write two test to demonstrate that acetic acid is acidic in nature.
12. State any two uses of alcohol.
13. Light enters from air to glass having refraction index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3×108 ms-1.
14. What is the difference between real and virtual images?
15. What are the conditions for no refraction?
16. An object is placed at 10cm in front of a concave mirror of focal length 15cm. Find the position, nature and size of the image.
17. Element X with atomic no. 11 and element Y with atomic no. 16 reacts with hydrogen to form hydrides . Write formula of their hydrides . Which of them will have high melting point and why?