(Download) CBSE Class-10 Sample Paper And Marking Scheme 2015-16 : Science

Sample Question Paper 2016

Science

Class – X (SA – II)

Time allowed: 03 Hours

Maximum Marks: 90

General Instructions:
(i) The question paper comprises two sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no choice in any of the question.
(iv) All questions of Section-A and B are to be attempted separately.
(v) Question numbers 1 to 3 in Section - A are one mark question. They are to be answered in one word or in one sentence.
(vi) Question numbers 4 to 6 in Section - A are two marks questions. These are to be answered in 30 words each.
(vii) Question numbers 7 to 18 in Section - A are three marks questions. These are to be answered in about 50 words each.
(viii) Question numbers 19 to 24 in Section-A are 5 marks questions. These are to be answered in 70 words each.
(ix) Question numbers 25 to 33 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.
(x) Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief.

SECTION – A

1 Name the process of converting vegetable oil to vegetable ghee. 1

2 Give reason for the statement- Since the ovary releases one egg every month, the uterus also prepares itself every month by making its lining thick and spongy.1

3 Name the component of white light that has the greatest wavelength.1

4 Which natural resource are the „biodiversity hot spots‟? Suggest what happens when there is a loss of biodiversity? 2

5 Write the name and molecular formula of an organic compound having its name suffixed with „–ol‟ and having two carbon atoms in the molecule. With the help of a balanced equation indicate what happens when its heated with excess of conc. H₂SO₄. ½ + ½ +1

6 A cube of edge 6 cm is placed over a printed page. At what distance from the top surface of cube will the letters appear when seen from above? Refractive index of glass is 1.5 2

7What is meant by isomers? “We can not have isomers of the first three members of alkane series” give reason to justify this statement. Draw the structures of two isomers of pentane, C₅H₁₂ 1+1+1

8 i) Name the following:

a) Third member of aldehyde series
b) Second member of carboxylic series
ii) Write the IUPAC name of the following:

9 Four elements A, B, C and D have atomic numbers 12, 13, 14 and 15 respectively.
Answer the following questions giving reasons -
i) What is the number of valence electrons and valency of D?
ii) Which of them will have largest atomic radii?
iii) Which of these elements will form the most basic oxide? 1+1+1

10 Differentiate between combustion and oxidation reactions of ethanol. 3

11 In a germinating seed, which parts are known as future shoot and future root? Mention the function of cotyledon. 3

12 What is placenta? Write any two major functions of placenta. 3

13 „Different species use different strategies to determine sex of a newborn individual. It can be environmental cues or genetically determined‟. Explain the statement by giving example for each strategy. 3

14 A 2 cm high object is placed at a distance of 32 cm from a concave mirror. The image is real, inverted and 3 cm in size. Find the focal length of the mirror and the position where the image is formed? 3

15 A child while playing with his father‟s spectacles burnt a hole in a piece of paper by focusing a small image of the sun on it.
(i) What defect of vision his father is suffering from?
(ii) Write two causes for this defect?
(iii) Draw a ray diagram to show image formation by the defective eye?
(iv) Draw a ray diagram showing corrected eye using proper lens. 3

16 Explain the formation of rainbow in the sky with the help of a diagram. List the three phenomena involved in proper sequence. 3

17 Which types of people are benefited from the development of different resources? Why do we need to use the resources carefully? 3

18 Write any three characteristics of a food chain. Dharmesh always treated the chemical effluent before disposing it in the water body. Mention any three moral values possessed by Dharmesh. 3

19 In the following table. Six elements A, B, C, D, E and F of the modern periodic table with atomic numbers 3 to 18 are given:

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