CBSE Class 10 Science Question Paper 2021 Set 03 Solved

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SECTION A
 
1. What is the nature and size of the image formed by a concave mirror if the magnification produced by the mirror is +3?
 
2. Which gas is evolved when sodium hydrogen carbonate is treated with dil.hydrochloric acid? 
 
3. What change in colour is observed when white silver chloride is left exposed to sun light? State the type of chemical reaction in this change.
 
4. 1. What is life processes?
 
2. Name the type of nutrition
 
a) Fungi like bread mould, yeast, mushroom breakdown the food materials outside the bod y and absorb it.
 
b) Cuscuta, lices and ticks derive nutrition from plants or animals without killing them.
 
5. 1.Write the aim of the experiment when potted plants kept with potassium hydroxide and without potassium hydroxide under a bell jar to assess the rate of photosynthesis.
 
2. What is the role of potassium hydroxide?
 
6. Name the type of mirror preferred as (i) rear view mirror in vehicles (ii) solar furnaces. Justify your answer in each case.
                                          OR
A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror.
 
(i) Write the type of mirror .Give reason.
 
(ii) Find the distance of the image from the object.
 
(iii) What is the focal length of the mirror?
 
7. An object 2 cm in size is placed 25 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and size of the image formed?
 
8. (i) Can absolute refractive index of a medium be less than one? Give reason.
 
(ii) The refractive index of water is 1.33. What is the meaning of this statement.
 
(iii) The refractive index of two transparent media A and B are 1.33 and 1.5 respectively. In which of the two medium light travels faster and why?
 
9. (i) State the laws of refraction of light.
 
(ii) Write the S.I .unit of refractive index.
 
10. You could have noted that when copper powder is heated in a china dish, the surface of copper powder gets coated with black coloured substance.
 
(a) What is this black substance?
 
(b) Why is this black coloured substance formed?
 
(c) Write the balanced chemical equation of the reaction taking place.
                                     OR
Identify the substance oxidized and substance reduced in the following reactions:
 
(a) ZnO + C→ Zn) + CO
 
(b)CuO+ H2 → Cu + H2O
 
(c) Fe2O3 + 2 Al→ 2 Fe + Al2O3
 
11. What are Olfactory indicators? What happens when a base reacts with a non-metallic oxide? What would you infer about the nature of non-metallic oxide?
 
12. (a) What will you observe when a drop of phenolphthalein is added to the solution of lime water?
 
(b) Name the products formed when granulated zinc reacts with sodium hydroxide.
 
(c) What do all acids and bases have in common?
 

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The CBSE Class 10 Science Question Paper 2021 Set 03 Solved 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 2021 Set 03 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 10 Science Question Paper 2021 Set 03 Solved 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 2021 Set 03 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 10 Science Question Paper 2021 Set 03 Solved 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 2021 Set 03 Solved in different languages?

Yes, where applicable, CBSE Class 10 Science Question Paper 2021 Set 03 Solved is available in both English and Hindi mediums. All students from Class 10 can access Science study material in their preferred language.

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