CBSE Board Sample Paper

Subject – Science

Class – X

Time:                                                                                          M.M--40

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.

Q1.Define lateral magnification.

Q2: The image formed is always erect. The mirror is

          A. Plane        B. Concave               C. Convex                    D. Plane or convex

Q3. Define diopter.

Q4. Following is stored in the form of carbohydrates in human body.

             a. Starch           b. Glucose            c. Glycogen              d. Fructose

Q5. The blood leaving the tissues become richer in

             a. CO2               b. Water               c. Haemoglolun         d. Oxygen

Q6. What are rod shaped and cone shaped cells?How do they help us in seeing colors?

Q7. Two carbon compounds A and B have the molecular formula C₃H₈ and C₃H₆ respectively. Which one of the two is most likely to show addition reaction?  Justify your answer. Explain how addition reaction is useful in vegetable ghee industry?

Q8. 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?

Q9. What type of a mirror is used as a reflector in street lamps? Why?

Q10. Name the endocrine gland associated with brain.

Q11. Why does an ink dot appear to be raised when viewed through a glass slab? [given ^aµ_g = 3/2]

Q12. Write the sign conventions used for spherical mirrors?

Q13.Give differences between Diamond and Graphite.

Q14. a. Draw the T.S. of human heart.

        b. Why do veins have thin walls as compared to arteries.

         c. Dist the contents of the blood.

Q15. Classify the element of third period into metal & non – metal of the modern periodic table?

Q16. a. Draw the diagram of brain & label its parts.

         b. Clearly list down the functions of each part of the brain.

         c. Differentiate between voluntary and involuntary actions.

Q17. Give reasons of the following;

       a. The sky near the horizon appears to have reddish view at the time of sunrise and sun set.

       b. The sky appears dark to an astronaut.

       c. The planets do not twinkle.