CBSE 2019 Science Question Paper for Class 10

About this paper

This is the CBSE Class 10 Science question paper from the 2019 board examination, code 31/3/3, Series JMS/3, Set 3. It carries 80 marks for three hours and has 27 compulsory questions in five sections, from one-mark answers in Section A to five-mark long answers in Section D. Section E has six two-mark questions on practical skills, such as reading a voltmeter scale, preparing a leaf peel mount and testing ethanoic acid. Internal choices are given in Sections B, C, D and E. The questions span physics, chemistry and biology chapters, including electricity, light, carbon compounds, metals, heredity and reproduction. This copy has questions only, without answers.

Exam

CBSE Class 10

Subject

Science

Year

2019

Paper code

31/3/3

Maximum marks

80

Time allowed

3 hours

Questions

27

Pages

11

Answers included

No, questions only

Paper pattern

• Section A

  2 marks

  Questions 1–2, one mark each, answered in a word or a sentence

• Section B

  6 marks

  Questions 3–5, two marks each, about 30 words; internal choice

• Section C

  30 marks

  Questions 6–15, three marks each, about 50 words; internal choice

• Section D

  30 marks

  Questions 16–21, five marks each, about 70 words; internal choice

• Section E

  12 marks

  Questions 22–27, two marks each, based on practical skills; internal choice

Topics covered

• Chemical reactions and equations
• Acids, bases and salts
• Metals and non-metals
• Carbon and its compounds
• Periodic classification of elements
• Life processes
• Control and coordination
• How do organisms reproduce
• Heredity and evolution
• Human eye and the colourful world
• Electricity
• Magnetic effects of electric current

Questions from this paper

1. List two causes of presbyopia. Draw a labelled diagram of a lens used for the correction of this defect of vision.
2. Write the chemical formula of washing soda. How can it be obtained from baking soda? List two industries in which washing soda is used for purposes other than washing clothes.
3. What is haemoglobin? State the consequences of a deficiency of haemoglobin in our bodies.
4. Two identical resistors of 12 Ω each are connected to a battery of 3 V. Calculate the ratio of the power consumed by the resulting combinations with minimum resistance and maximum resistance.
5. What are sexually transmitted diseases (STDs)? List two viral and two bacterial STDs.
6. What is observed about 1 hour after adding strips of copper and aluminium separately to ferrous sulphate solution in two beakers? Name the reaction if any change in colour is noticed, and write its chemical equation.