CBSE Class 10 Science Question Paper 2019 Set 09 Solved

CBSE Class 10 Science Question Paper Solved 2019 Set I. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. Define 1 kilowatt hour.

2. Generally, we do not clean natural ponds or lakes but an aquarium needs periodic cleaning. Why ?

SECTION B

3. List two causes of presbyopia. Draw labelled diagram of a lens used for the correction of this defect of vision.

4. Show the formation of Na₂O by the transfer of electrons.

5. List in tabular form two differences between reflex action and walking.

OR

List in tabular form two differences between pepsin and trypsin.

SECTION C

6. Name the process used to harness nuclear energy these days. Explain it briefly. List two advantages of using nuclear energy in place of fossil fuels.

7. Why are forests considered ‘‘biodiversity hot spots’’ ? Suggest four approaches towards the conservation of forests.

8. What is atmospheric refraction ? Explain with the help of a labelled diagram that the position of a star as seen by us is not its true position.

OR

When do we consider a student sitting in the class to be myopic ? List two causes of this defect. Explain using a ray diagram how this defect of eye can be corrected.

9. 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 other purposes than washing clothes.

10. Out of three metals P, Q and R, P is less reactive than Q and R is more reactive than P and Q both. Suggest an activity to arrange P, Q and R in order of their decreasing reactivity.

OR

Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore. 

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper Solved 2019 Set I.