Download CBSE Sample Paper for Class 10th Science SA 2
Sample Question Paper SCIENCE (Theory) Class- 10th
Summative Assessment – II
Time : 3 hours Maximum Marks : 80
i) The question paper comprises of two sections, A and B. You are to attempt both the
ii) All questions are compulsory.
iii) There is no over all choice. However, internal choice has been provided in all the three
question of five marks category. Only one option in such question in to be attempted.
iv) All questions of section A and all questions of section B are to be attempted separately.
v) Question numbers 1 to 4 in section A are one mark questions. There are to be answered in one word or one sentence.
vi) Question numbers 5 to 13 are two mark questions, to be answered in about 30 words
vii) Question numbers 14 to 22 are three mark questions, to be answered in about
50 words each.
viii) Question numbers 23 to 25 are five mark questions, to be answered in about
70 words each.
ix) Question numbers 26 to 41 in section B are multiple choice questions based on
practical skills. Each question is a one mark question. You are to select one most
appropriate response out of the four provided to you.
Download link for this Science sample paper for class 10 is given below
- List the three phenomenon of light responsible for formation of rainbow in the sky.
- Draw the electronic dot structure of ethane molecule (C2 H6).
- List any two common methods by which solid wastes of urban areas are disposed off.
- Identify which one of the following would have a hazardous impact if they persist in the environment for a longtime:
Newspaper, vegetable peels, pesticides, waste from cattle shed.
- Why do we see stars twinkling where as, where as planets do not twinkle.
- An object is placed perpendicular to the principle axis of a convex lens of focal length 10 cm, The distance of the object from the optical centre of the lens is 15 cm. Calculate the position of the image formed. Mention the nature of the image formed.
7. i) What is meant by power of accommodation of the eye’?
ii) How does the focal length of the eye lens change when we shift looking from a distant object to a nearby object?
8. a) Why are coal and petroleum called fossil fuels?
b) Name the two elements which are present both in CNG and petroleum.
9. (i) What is the position of hydrogen is the modern periodic table?
(ii) Where are isotopes of the same element having different atomic masses placed in the periodic table?
10. Account for the following:
(i) Elements in a group of the periodic table have similar chemical properties.
(ii) Elements of group 18 are called zero valent.
- “Construction of dams ensures electricity generation for a large number of villages”. State two reasons for opposition to construction of dams in spite of this advantage.
- a) Which glands contribute fluid to the semen?
b) State two advantages semen offers to the sperms.
13. List two advantages of vegetative propagation. In which two of the following plants is vegetative
Banana, Rice, Tomato, Rose
14. i) Define power of a lens and write its S.I. Unit.
ii) The image of an object formed by a convex lens is of the same size as the object. If the image in formed at a distance of 50cm from the lens, at what distance from the lens is the object placed? Find the focal length and power of the lens used.
15. A person cannot see objects farther than 10 m from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for (i) the defective eye, (ii) its correction.
16 i) A ray of light A B is incident on a glass slab, as shown. Mention the values of angle of
incidence and angle of refraction for this ray of light.
ii) Light enters from air into a glass plate having refraction index 1.5, Calculate the speed of light in glass, (speed of light in air = 3×10sm/s)
17. What is saponification? Explain the cleansing action of soap.
18. How would the following properties of the element vary along the period from left to right in the modern periodic Table. Give reasons.
a) Tendency to lose electrons
b) Atomic Size
9. a. What are fossils?
b. List and describe two ways to decide how long ago the organisms were alive.
20.”The sex of the new born child depends on its father and not on its mother.” Justify the statement and support your answer with a neat illustration.
21. What are acquired traits? “Acquired traits are not capable of directing evolution”. Justify this statment by giving atleast two reasons.
22. List and describe any three methods of birth control.
2. Name the type of mirror (s) that should be used to obtain
i) a magnified and virtual image 1
ii) a diminished and virtual image of an object. 1
24. Draw labelled ray diagrams to show the formation of the required image in each of the above two cases. Which of these mirrors could also form a magnified and real image of the object? State the position of object for which this could happen.
(a) Draw a ray diagram in each of the following cases to show the position and nature of the
image formed when the object is placed:
(i) between optical centre and principal focus (F) of a convex lens.
(ii) between F and 2F of a convex lens.
(iii) as 2F of a convex lens.
(b) How will the nature and position of image formed change in case (i) and (ii) in part (a) of
this question if the lens is replaced by a concave lens?
24. a) Compete the following equations:
(a) Define homologous series of organic compounds. Mention any two characteristics of homologous series.
(b) Name the compound formed on heating ethanol at 443k with excess of cone. H2 S04.
(c) Describe a chemical test to distinguish between ethanol and ethanoic acid.
25. (a) Name one organ each in female and male reproductive system which plays a role of endocrine gland along with production of germ cells. Name one hormone secreted by each them.
(b) State two advantages to the development of the embryo in the mother’s womb.
(c) Where does fertilization occur in case of human female and name the place where fertilized egg gets implanted.
(a) Give an example of a bisexual flower. What is its female reproductive part know as?
(b) Draw a diagram of its longitudinal section showing the process of germination of pollen on stigma and label the following on it:
(i) male germ cell (iii) ovary
(ii) female germ cell (iv) pollen tube
(c) Pollination may occur without fertilization but fertilization will not take place without pollination. Give reason…..
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