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Thursday, 31 December 2015


                            SAMPLE QUESTION PAPER
                                           S.A II
                                 CLASS X - SCIENCE
TIME: 3 hours                                                                                                                                                                                            Max. Marks: 90

                                                    SECTION A
1) Among the following which one have a triple covalent bond ? 
C2H6 , C3H4 , C4H10 (1)

2) Mention the most easy method to detect water pollution ? (1)

3) Name any two oxidising agents for alcohols? (1)

4) An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? (2)

5) (a) What is meant by power of accommodation of eye? 
(b) How does focal length of the eye lens change when we shift looking from distant object to nearby object? (2)

6) Distinguish between food chain and food web? (2)

7) Why do we seek construction of dams? Mention any two problems faced with the construction of large dams? (2)

8) Write the structural formula of the following and state whether these are isomers with reason? (a) 1 – butyne (b) 2 – butyne (3)

9) (a) Why ethene decolourises bromine water, but ethane not. 
(b) Write down the relevant chemical equation involved in discolouration? (3)

10) Based on the behaviour towards light how substances can be classified? Give one example of each? (3)

11) Describe three methods of plant propagation which are commonly used for growing garden plants? (3)

12) Draw a heat labelled diagram of longitudinal section of a typical flower? (3)

13) (a) Write the electronic configurations of the following elements? Oxygen, Magnesium (b) Among O2- ion and Mg2+ ion, which one have larger size and why? (3)

14) Mention any three purposes of using lens combinations in optical instruments?(3)

15) What are the consequences of ozone layer depletion? 
(Any three) (3)

16) What is meant by dispersion of white light? Draw a ray diagram to show dispersion of white light by a glass prism? Why do we get different colours? (3)

17) Energy flow in the biosphere is unidirectional. Comment on the statement (3)

18) Atomic numbers of the three elements A, B and C are given below. Element Atomic number A 5 B 7 C 10
Identify the group and period in which these elements belong? (3)

19) Why should we conserve forest and wild life? (Any three points) (3)

20) By drawing ray diagrams, show the formation of image, when an object is placed on the principal axis of a concave mirror at the following positions and write about the nature of the image in each case. 
(a) At infinity (b) Beyond the centre of curvature (c) At the centre of curvature (d) At the principal focus (e) Between the pole and focus (5)

21) Human resources in India are depleting with increasing number of people getting infected by AIDS virus and it has become a socio economic hazard. 
(a) Name the virus which causes AIDS? 
(b) Mention the modes of transmission of AIDS virus 
(c) What is the effect of AIDS virus on human body? 
(d) Give any two measures to prevent the transmission of aids virus (5)

22) An organic compound A is widely used as a preservative in pickles and has a molecular formula C2H4O2. This compound react with ethanol to form a sweet  smelling compound B. 
(a) Identify the compound A 
(b) Write the chemical equation for its reaction with ethanol 
(c) Name the products formed 
(d) Name the process involved in the reaction 
(e) How can we get back the compound A from B (5) 

 What is the cause of hardness of water? Why soap do not form lather with hard water? Mention the disadvantage of cleaning clothes with soap in hard water? (5)

23) (a) Distinguish between homologous and analogous organs with one example each
(b) Define F1, F2 generations
(c) Define the term variations (5)
24) Give reasons for the following 
(a) Colour of clear sky is blue 
(b) Sun can be seen about two minutes before actual sunrise 
(c) Traffic light signals are of red colour 
(d) Stars appears to twinkle 
(e) Planets do not twinkle (5)

To read this sample paper with solution click here .........

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