CBSE 2017 Science Question Paper for Class 10

About this paper

This is the CBSE Class 10 Science Summative Assessment II question paper, code 31/1 (Series HRK, Set 1), from the 2017 examination. It carries 90 marks over three hours plus 15 minutes of reading time and has 36 compulsory questions with no choice. Section A has 24 theory questions worth one, two, three and five marks, and Section B has nine one-mark multiple-choice questions and three two-mark questions based on practical skills, such as preparing soap, binary fission in Amoeba and focusing a candle flame with a convex lens. The theory covers carbon compounds, the periodic table, reproduction, heredity and evolution, lenses and mirrors, the human eye and natural resources. One three-mark question asks you to plan a water-saving awareness activity. This copy has the questions only, without answers.

Exam

CBSE Class 10

Subject

Science

Year

2017

Paper code

31/1

Maximum marks

90

Time allowed

3 hours + 15 min reading

Questions

36

Pages

16

Answers included

No, questions only

Paper pattern

• Section A

  75 marks

  Questions 1–24: three one-mark, three two-mark, twelve three-mark and six five-mark questions

• Section B

  15 marks

  Questions 25–36 on practical skills: nine one-mark multiple-choice and three two-mark questions

Topics covered

• Carbon and its compounds
• Periodic classification of elements
• How do organisms reproduce
• Heredity and evolution
• Light: reflection and refraction
• Human eye and the colourful world
• Our environment
• Management of natural resources

Questions from this paper

1. Write the molecular formulae of the 2nd and 3rd members of the homologous series whose first member is methane.
2. Distinguish between esterification and saponification reactions with the help of a chemical equation for each, and state one use of esters and of the saponification process.
3. What is vegetative propagation? State two advantages and two disadvantages of this method.
4. How did Mendel explain that it is possible for a trait to be inherited but not expressed in an organism?
5. A student with myopia cannot see distinctly objects beyond 5 m. List two possible causes, explain the defect and its correction with ray diagrams, and find the power of the corrective lens if its focal length is 5 m.
6. Draw in sequence, showing four stages, the process of binary fission in Amoeba.