CBSE Class 10 Science Sample Paper 2017 Set B

SECTION-A

1 The atomic number of an element X is 15. Identify its position in terms of group and period in the modern periodic table.

2 Why is it that the unit of evolution is population, not the individual ?

3 Name the gas which is produced due to incomplete combustion of fossil fuels.

4 Briefly describe an activity to find approximate focal length of a Convex lens.

5 List four changes in our habits which can make a difference in our energy consumption patterns.

6 Draw a sequence of suitable methods of disposal of waste produced at your home to minimize environmental pollution.

7 (a) At times we observe the bottoms of cooking vessels getting blackened. Why this happens ? (b) We use LPG at home which is mainly mixture of propane and butane. Give a balanced chemical equation for combustion of butane.

8 Be (4), Mg (12) and Ca (20) belong to the same group in the modern periodic table

(a) Name the period of each element.

(b) Write the electronic configuration of each element.

9 Mineral acids are used in laboratory but carboxylic acid like vinegar is used as a preservative in pickles. 

(i) Illustrate vinegar as a weak acid and hydrochloric acid as a strong acid with the help of ionisation equation.

(ii) Compare vinegar with glacial acetic acid.

10 Out of the following elements

H(1); Be (4); Na(11); Mg (12)

(a) Write the pair elements having similar chemical properties.

(b) state the group number of each pair.

(c) name one other element belonging to each of these groups.

11 Study of evolution and classification are interlinked. Explain. 

12 Explain with the help of a figure that father is responsible for the sex of a child. 

13 DNA content has the tendency to double itself during sexual reproduction due to combining of the genetic materials from two parents. How can the problem of DNA doubling be solved to maintain the consistency of the genetic material throughout the species ?

14 What happens when the following situations are initiated :

(a) A Planaria is cut into three different pieces.

(b) Leaf of the Bryophyllum with notches falls on the soil.

(c) Testosterone is released in the male reproductive system

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