CBSE Class 10 Science Sample Paper 2013 Set A

Section-A

Q.1 List the three phenomenon of light responsible for formation of rainbow in the sky.

Q.2 Why is DNA copying an essential part of the process of reproduction?

Q.3 List any two common methods by which solid wastes of urban areas are disposed off.

Q.4 Why do we see stars twinkling whereas, where as planets do not twinkle?

Q.5 (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?

Q.6 (i)Why are Coal and petroleum called fossil fuels?

      (ii) Name the two elements which are present both in CNG and Petroleum?

Q.7 (i) What is the position of hydrogen in the model periodic table?

      (ii) Where are isotopes of the same element having different atomic masses placed in the periodic table?

Q.8 Pure- breed pea plants A are crossed with pure breed pea plants B. It is found that the plants who look like A do not appear in F₁ generation but B re-emerge in F₂ generation. Which of the plants A and B:

      (i) tall,

      (ii) dwarf ? Give reason for your answer.

Q.9 A student sitting in the last row of the classroom is not able to read clearly the writing on the Blackboard:

       (a) Name the type of defect of vision he is suffering from

       (b) How can this defect be corrected ?

Q.10 (a) Name the compounds CH₃COOH and identify its functional group.

        (b) Give a chemical test to identify this compound.

        (c) Name the gas evolved when this compound acts on solid carbonate. How would you identify this gas.

Q.11(a) Explain the terms (i)Implantation (ii)Placenta

       (b) What is the average duration of human pregnancy?

       (c) What happens when the egg is not fertilized?

Q.12(a) A spherical mirror A forms an erect image of an object, a spherical mirror B forms erect as well as inverted image of an object. Name the types of the spherical mirror A and B.

       (b) What is the relation between the focal length and radius of curvature of a spherical mirror? If the radius of a curvature of a spherical Mirror is 25 cm, what is the focal length?

Q.13 An organic compound 'A‘ is an essential constituent of wine and beer. Oxidation of 'A‘ yields An organic acid 'B‘ which is present in vinegar. Name the compounds 'A‘ and 'B‘ and write their structural formula. What happens when 'A‘ and 'B‘ react in the presence of an acid Catalyst? Write the chemical equation for the reaction.

Q.14 which of the following are homologous and which are the analogous? Give reasons

        1. Trunk of the elephant and hand of a chimpanzee

        2. Wing of a bird and wing of a bat.

        3. Scales of fishes and shell of molluscs.

Please refer to attached file for CBSE Class 10 Science Sample Paper 2013 Set A