CBSE Class 10 Science Question Paper 2020 Set 04 Solved

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Explore authentic exam materials through the CBSE Class 10 Science Question Paper 2020 Set 04 Solved. Tailored for Class 10 learners, utilizing these Science previous year papers ensures thorough preparation and strengthens time management skills before final CBSE evaluations.

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SECTION A
 
1 What is saliva? State its role in the digestion of food? 
 
2 Name the ‘blob’ that develops at the tip of the sporagiophore in Rhizopus 
 
3 a) What do you mean by redox reaction.
 
b) Identify the substance oxidized and substance reduced in the given chemical equation
 
 MnO2 + 4HCl  →  MnCl2 + 2H2O + Cl2
 
4 List two reasons which limit the usage of solar cells for harnessing energy for domestic use? 
 
5 “A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself”. Draw a diagram to justify the statement.
 
6 How do Mendel’s experiments show that traits may be dominant or recessive? 
 
7 The image of an object formed by a lens is of magnification -1. If the distance between the object and image is 60 cm, what is the focal length of the lens? If the object is moved 20 cm towards the lens, where would the image be formed? State reason and also draw a ray diagram in support of your answer
 
8 a) With the help of an activity show that water is necessary for acids to produce hydrogen ions.
 
b) Show the dissociation of HCl in water with the help of an equation.
                                    OR
a) What happens when metal carbonates react with acids, give example with suitable equation for the reaction?
 
b) How will you test the presence of carbon dioxide gas? What happens when excess of carbondioxide is passed? Give suitable chemical equation for the above reaction.
 
9 a)Label the parts A,B,C and D
 
b)Write the functions of the parts labelled as A,B and D
 
CBSE Class 10 Science Question Paper Solved 2020 Set D
 
10 Explain the following:
 
(a) The elements of electric heating devices such as bread toasters and electric iron are made of an alloy rather than pure metal.
 
(b) Series arrangement is not used for domestic circuits.
 
(c) Copper and aluminium wires are usually employed for electricity transmission.
 
11 What is short circuiting of an electric circuit? An electric motor of 1.5 KW power rating is operated in a domestic electric circuit of current rating 5A.What would happen when it is switched ON? Give reason for your answer.
                                   OR
A coil of insulated copper wire is connected to a galvanometer. What would happen If a bar magnet is
 
(i)Pushed into the coil
 
(ii) Withdrawn from inside the coil?
 
(iii)Held stationary inside the coil?
 
12 a) Draw the structure of benzene and write its formula.
 
b)Show the formation of Na2O by the transfer of electrons. Identify the type of bond formed.
 
13 Differentiate between Modern periodic table and Mendeleev’s periodic table.
 
14 Explain the ways by which evolutionary relationships can be traced.
                                 OR
What is reflex action and give one example?Name the part of nervous system that controls this action.
 
15 You were standing on the road side, then you saw a family travelling in a car .An ambulance carrying a patient for dialysis was travelling behind the car. The driver of the car brought his
 
a) What is dialysis?
 
b) What is the principle behind dialysis?
 
c) What value was shown by the driver?


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Where can I download the official PDF for CBSE Class 10 Science Question Paper 2020 Set 04 Solved?

The CBSE Class 10 Science Question Paper 2020 Set 04 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 2020 Set 04 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 10 Science Question Paper 2020 Set 04 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 2020 Set 04 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 10 Science Question Paper 2020 Set 04 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 2020 Set 04 Solved in different languages?

Yes, where applicable, CBSE Class 10 Science Question Paper 2020 Set 04 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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