CBSE Class 10 Science Question Paper Solved 2020 Set A

Access and download CBSE Class 10 Science Question Paper Solved 2020 Set A, carefully designed as per the latest 2025-26 examination guidelines issued by CBSE, NCERT, and KVS. These Class 10 Science previous year question papers include detailed solutions, helping students to assess their performance and identify and improve key areas before the final exams.

Solved Science Question Papers for Class 10

Practicing these Class 10 Science question papers is the best way to understand the actual exam pattern and marking scheme. By solving these papers under timed conditions, Class 10 students can improve their speed and accuracy. Download the full CBSE Class 10 Science Question Paper Solved 2020 Set A to begin your self-assessment today.

Science Class 10 Question Paper PDF with Solutions

SECTION A
 
1. Wing of a bird and wing of a bat are examples of analogous organ. Justify the answer giving a suitable reason.
 
2. All information for our environment is detected by specialized tips of some nerve cells. Mention the name given to such tips and mention where they are located.
 
SECTION B
 
3. A white colored powder is used by doctors for supporting fractured bones.
 
a) Write chemical name and formula of the powder.
 
b) On mixing this powder with water, a hard solid mass is obtained.
 
Write balanced chemical equation for the change.
 
4. Write any two methods to improve the efficiency of a solar cooker.
                          OR
State any two limitations and two advantages of hydro energy.
 
5. a) What name is given to the sequence of gradual changes over millions of years in which new species are formed.
 
b) Name two human traits which show variation.

SECTION C

6. How ocean thermal energy is harnessed? Write one limitation and one advantage of ocean thermal energy.
 
7. Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating?
 
8. A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and magnification.
                     OR
An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm, determine the position, nature and size of the image.
 
9. Draw a ray diagram to show the position and nature of the image formed when the object is placed between the pole P and focus F of a concave mirror. Write the nature, and size of the image.
 
10. a) Based on electronic configuration, how will you identify the first and the last element of a period.
 
b) “Hydrogen occupies a unique position in modern periodic table. „‟Justify the statement.
 
c) Give two reasons for the late discovery of noble gases.
 
11. a) Why does aqueous solution of acid conduct electricity?
 
b) Hydrochloric acid is a strong acid and ammonium hydroxide is a weak base. Explain.
 
c) During chlor-alkali process, where are chlorine, Hydrogen and sodium hydroxide produced?
                                       OR
a) Why does tooth decay start when pH of the mouth falls below 5.5?
 
b) What is meant by “water of crystallization”? How would you show that blue color copper sulfate crystals contain water of crystallization?
 
12. a) Show the formation of Na2O by transfer of electrons.
 
b) What are amphoteric oxides? Give an example.
 
c) Why is the melting point of NaCl high?
 
13. Explain how water and minerals are transported in plants?
                                    OR
What is translocation? How does it take place in plants?
 
14. The genotype of a green stemmed tomato plant is denoted by “GG” and that of a purple stemmed tomato plant as “gg”. When these two plants are crossed,
 
a) what colour of stem would you expect in their F1 progeny.
 
b) give the percentage of purple stemmed plant if F1 plants are self- pollinated.
 
c) in what ratio would you find the green and purple colour in the F2 progeny.
 
15. A gland secrets a particular hormone. The deficiency of this hormone in the body causes a particular disease in which blood sugar level rises.
 
a) Name the gland and the hormone secreted by it.
 
b) Mention the role played by this hormone.
 
c) Name the disease caused due to the deficiency of this hormone.


Please click on below link to download CBSE Class 10 Science Question Paper Solved 2020 Set A

2012
CBSE Class 10 Science Question Paper 2012 (1)
CBSE Class 10 Science Question Paper 2012 (10)
CBSE Class 10 Science Question Paper 2012 (11)
CBSE Class 10 Science Question Paper 2012 (12)
CBSE Class 10 Science Question Paper 2012 (13)
CBSE Class 10 Science Question Paper 2012 (14)
CBSE Class 10 Science Question Paper 2012 (15)
CBSE Class 10 Science Question Paper 2012 (16)
CBSE Class 10 Science Question Paper 2012 (2)
CBSE Class 10 Science Question Paper 2012 (3)
CBSE Class 10 Science Question Paper 2012 (4)
CBSE Class 10 Science Question Paper 2012 (5)
CBSE Class 10 Science Question Paper 2012 (6)
CBSE Class 10 Science Question Paper 2012 (7)
CBSE Class 10 Science Question Paper 2012 (8)
CBSE Class 10 Science Question Paper 2012 (9)
CBSE Class 10 Science Question Paper SA 2 2012 (1)
CBSE Class 10 Science Question Paper SA 2 2012 (10)
CBSE Class 10 Science Question Paper SA 2 2012 (11)
CBSE Class 10 Science Question Paper SA 2 2012 (12)
CBSE Class 10 Science Question Paper SA 2 2012 (13)
CBSE Class 10 Science Question Paper SA 2 2012 (14)
CBSE Class 10 Science Question Paper SA 2 2012 (15)
CBSE Class 10 Science Question Paper SA 2 2012 (16)
CBSE Class 10 Science Question Paper SA 2 2012 (17)
CBSE Class 10 Science Question Paper SA 2 2012 (2)
CBSE Class 10 Science Question Paper SA 2 2012 (3)
CBSE Class 10 Science Question Paper SA 2 2012 (4)
CBSE Class 10 Science Question Paper SA 2 2012 (5)
CBSE Class 10 Science Question Paper SA 2 2012 (6)
CBSE Class 10 Science Question Paper SA 2 2012 (7)
CBSE Class 10 Science Question Paper SA 2 2012 (8)
CBSE Class 10 Science Question Paper SA 2 2012 (9)
CBSE Class 10 Science Question Paper SA1 2012
CBSE Class 10 Science Question Paper SA2 2012 (1)

CBSE Class 10 Science Question Paper Solved 2020 Set A

To understand the types of questions asked in past examinations, it is very important for Class 10 students to solve the CBSE Class 10 Science Question Paper Solved 2020 Set A provided above. You can easily download these past papers for Class 10 Science in PDF format for the last 10 years. By practicing these actual exam questions you will gain an understanding of the difficulty level and the variety of topics covered over the years. By solving these Previous Year Papers (PYPs) you will understand both descriptive and MCQ questions in your final tests.

Importance of solving CBSE Class 10 Science Question Paper Solved 2020 Set A

Regularly practicing CBSE Class 10 Science Question Paper Solved 2020 Set A is the best way to improve your score in Class 10 Science. These papers will give you details of the marking scheme and the paper structure used by the CBSE. By regularly attempting these under actual exam conditions at home, you can slowly improve your time management skills, which will help you to complete your Science paper within the allowed duration.

Benefits of downloading CBSE Class 10 Question Papers

Having the CBSE Class 10 Science Question Paper Solved 2020 Set A in PDF format allows you to revise key concepts anywhere, even without an internet connection. These sets are a reliable tool to practice numerical problems and understand the correct approach to all types of answers. After solving the questions, you should compare your work with the solutions provided by our teachers. Along with these papers, students should always solve the Class 10 Science Sample Papers and MCQ tests on studiestoday.com for a complete revision.

Where can I download the official PDF for CBSE Class 10 Science Question Paper Solved 2020 Set A?

The CBSE Class 10 Science Question Paper Solved 2020 Set A is available for download on StudiesToday.com. It includes complete set with all sections so that Class 10 students can practice with the exact same paper that came in the CBSE exams.

Are the solutions for CBSE Class 10 Science Question Paper Solved 2020 Set A based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 10 Science Question Paper Solved 2020 Set A are prepared by subject matter experts as per official marking scheme. Class 10 students will understand the structure of answers and 'step-marks' methodology Science.

How does solving CBSE Class 10 Science Question Paper Solved 2020 Set A help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 10 Science Question Paper Solved 2020 Set A is important to understand repeat themes and question difficulty levels of Science. It helps Class 10 students to test their time management skills too.

Can I access CBSE Class 10 Science Question Paper Solved 2020 Set A in different languages?

Yes, where applicable, CBSE Class 10 Science Question Paper Solved 2020 Set A is available in both English and Hindi mediums. All students from Class 10 can access Science study material in their preferred language.

Is there a charge to download the CBSE Class 10 Science solved papers?

No, all previous year question papers on StudiesToday, including CBSE Class 10 Science Question Paper Solved 2020 Set A, are provided free of charge in mobile-friendly PDF.