CBSE Class 10 Science Sample Paper Solved 2021 Set D

Science
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Read and download the CBSE Class 10 Science Sample Paper Solved 2021 Set D, designed by expert teachers according to the latest 2025-26 curriculum and examination pattern issued by CBSE, NCERT, and KVS. These Class 10 Science sample papers include detailed step-by-step solutions, helping students to practice and evaluate their performance against the most recent marking schemes.

Solved Sample Paper for Class 10 Science PDF

Our Class 10 Science model papers are important for understanding the weightage of different chapters and the difficulty level of expected questions. By solving these guess papers Class 10 students can identify weak areas and improve time management. We also suggest referring to our Class 10 Science Question Papers of previous years to further strengthen your exam preparation.

Class 10 Science Sample Paper with Solutions

SECTION A
 
1. Name the sex hormone secreted by male and female sex organs in human beings. 
 
2. Write any two harmful effects of ozone depletion. 
 
SECTION B
 
3. “Rain water harvesting is essential”. Justify this statement giving two reasons. 
 
4. Give two advantages and disadvantages of harnessing wind energy to produce electricity.
 
                                                        OR
 
Compare and contrast fossil fuel and energy obtained from the Sun as direct sources of energy.
 
5. a) Write any two factors could lead to the rise of a new species.
 
b) Give an example of characteristics being used to determine how close two species are in evolutionary terms.
 
SECTION C
 
6. An object of height 6cm is placed at a distance of 20 cm from a concave lens of focal length 10cm. Find the position and size of the image. Also draw the respective ray diagram.
 
7. a) The refractive index of diamond is 2.42. What is the meaning of this statement?
 
b) What is the speed of light in water whose refractive index is 1.33. Given that the speed of light in vacuum is 3 x 108 m/s?
 
8. a) What is a solenoid?
 
b) Explain with the help of a diagram how current is induced in a solenoid using a bar magnet.
 
                                                     OR
 
a) Describe with the help of a diagram an activity to show that a magnetic field is produced around a current carrying circular loop.
 
b) How can we increase the strength of magnetic field thus produced?
 
9. a) Derive an expression for effective resistance when three resistors are connected in parallel.
 
b) What are the advantages of parallel connection over series connection in a domestic electric circuit.
 
10. a) Complete the equations.
 
i) CH3COOC2H5 + NaOH →
 
ii) CH4 + 2O2 →
 
b) Define the terms: i) catination   ii) co-valent bond.
 
11. a) State Modern periodic law.
 
b) What is meant by periodicity in properties of elements with reference to the periodic table?
 
c) Why do all elements in the same group have similar properties?
 
                                                 OR
 
a) The reaction of a metal „X‟ with ferric oxide is highly exothermic. The metal „X‟ is obtained from its ore by electrolytic reduction. Identify „X‟ and write its reaction with ferric oxide. What is the most common use of this reaction?
 
b) Explain chlor-alkali process?
 
12. Part of periodic table is given below where atomic numbers of elements are given in bracket.
 
Li(3)                      Be(4)
 
Na(11)                  Mg(12)
 
K(19)                    Ca(20)
 
Rb(37)                  Sr(38)
 
a) Give the electronic configuration of K.
 
b) What is the formula of the compound between Ca & Hydrogen?
 
c) Arrange the elements Be, Mg, Ca & Sr in the decreasing order of reactivity.
 
d) Which is bigger in size Na or Mg & why?
 
13. a) How will you estimate the age of the fossils?
 
b) What is meant by evolution? Mention the tools which help in tracing evolutionary relationship in human being?
 
14. a) How is the process of pollination different from Fertilization? Name the two types of pollination.
 
b) Why is DNA copying an essential part of the process of reproduction?
 
                                               OR
 
a) Mention the role of seminal vesicles and prostate gland?
 
b) Draw a diagram of the longitudinal section of a typical flower and label the parts given below
 
i) Male reproductive system
 
ii) Female germ cell
 
iii) Sepals
 
iv) Stigma
 
15. What can you as an individual do to reduce your consumption of the various natural resources? 
 
SECTION D
 
16. a) Explain with the help of a labelled diagram the force acting on a metal rod placed in a magnetic field.
 
b) Name the rule that shows the direction of force.
 
c) State the rule which shows the direction of force acting on this current carrying conductor.
 
                                           OR
 
a) Name the device that converts electrical energy into mechanical energy.
 
b) Explain the principle and working of this device with the help of a labelled diagram.
 
17. a) Explain the formation of rainbow in the sky with the help of a ray diagram.
 
b) List the three phenomena involved the formation of rainbow in proper sequence.
 
c) Explain why stars appear to twinkle in the sky but planets do not.
 
18. a) State any two limitations of Mendeleev‟s classification of elements.
 
b) How many groups & periods are present in modern periodic table?
 
c) The element [X] has atomic number 17. Write its group and period number in the modern periodic table.
 
d) Metallic character increases down a group. Why?
 
a) Giving one example each, explain how the following metals are obtained from their compounds by the process of reduction.
 
i) Metal „A‟ which is low in activity series of metals.
 
ii) Metal „B‟ which is in the middle of the activity series of metals.
 
b) i) What is meant by refining of metals?
 
ii) In the electrolytic refining of metal „M‟, name the cathode, anode and electrolyte.
 
19. a) Draw the electron dot structure of methane molecule.
 
b) Write the name of the following compounds:
 
i) CH3COCH3   ii) C2H2
 
c) Name the carbon compound which when heated with conc.H2SO4 produces ethane gas. Write the chemical equation for the reaction. State the role of conc.H2SO4 in the reaction.
 
d) Soaps do not work well with hard water. Why?
 
20. a) Write any two differences between reflex action and walking
 
b) Draw a neat diagram of reflex arc and label any four parts.
 
21. a) List any two characteristics of alveoli to facilitate the exchange of gases
 
b) What are the four methods used by plants to get rid of excretory products?
 
c) What would be the consequences of a deficiency of haemoglobin in our body?
 
d) What is the role of mucus in the stomach?
 
                                           OR
 
a) Draw a neat diagram of excretory system in human being and label the parts given below
 
i) Urethra   ii) Vena cava   iii) Urinary bladder   iv) Kidney
 
b) State any two differences between aerobic respiration and anaerobic respiration.
 
SECTION E
 
22. In an electric circuit, a resistor of 5 Ω resistance is connected to a battery of 10V using an ammeter and a plug key. In this circuit, another resistor of 3 Ω resistance is connected in series with 5 Ω resistor. Calculate the change in the total current flowing through the circuit?
 
                                          OR
 
Among the following instruments:
Milliammeter A1 of least count 20 mA
Milliammeter A2 of least count 10 mA
Voltmeter V1 of least count 0. 2 V
Voltmeter V2 least count 0.3 V
 
Which milliammeter and voltmeter would be selected for carrying out the experiment to determine the equivalent resistance of two resistors connected in series. Why?
 
23. The image formed by a spherical mirror when the object is placed between principal focal length and pole of the mirror is erect and magnified. Name the type of mirror. Draw a labelled ray diagram to support your answer.
 
24. When a student added zinc granules to dilute HCl, a colourless & odourless gas was evolved which was then tested with a burning match stick. What would be observed?
 
                                        OR
 
Explain all your observations.
 
a) Copper wire is kept in silver nitrate solution
 
b) Zn strip is kept in copper sulphate solution.
 
25. A student took 2ml of ethanoic acid in a test tube. He added a pinch of white powder „X‟ in it and found that a gas „Y‟ is released with effervescence. He also observed that the gas Y turned lime water milky. Based on his observation, answer the following:
 
a) Give the names of X &Y.
 
b) Give the balanced equation for the reaction between ethanoic acid & X.
 
26. When observed under high power of the microscope, “chain of buds” is visible in the microscopic view. In which organism can it be observed? Define the process
 
27. In the experimental set up on CO2 is released during respiration, if one forgets to keep the small test tube with KOH in the conical flask, How will the result vary? Give two points
 
                                                 OR
 
Write two precautions to be taken while identifying different parts of an embryo of the dicot seed.

 

Please click on below link to download CBSE Class 10 Science Sample Paper Solved 2021 Set D

2025
CBSE Class 10 Science 2025 Sample Paper Solved Set 1
CBSE Class 10 Science 2025 Sample Paper Solved Set 10
CBSE Class 10 Science 2025 Sample Paper Solved Set 2
CBSE Class 10 Science 2025 Sample Paper Solved Set 3
CBSE Class 10 Science 2025 Sample Paper Solved Set 4
CBSE Class 10 Science 2025 Sample Paper Solved Set 5
CBSE Class 10 Science 2025 Sample Paper Solved Set 6
CBSE Class 10 Science 2025 Sample Paper Solved Set 7
CBSE Class 10 Science 2025 Sample Paper Solved Set 8
CBSE Class 10 Science 2025 Sample Paper Solved Set 9
CBSE Class 10 Science Boards 2025 Sample Paper Solved
2024
CBSE Class 10 Science Sample Paper 2024
2023
CBSE Class 10 Science Sample Paper 2023
CBSE Class 10 Science Sample Paper 2023 Set A
CBSE Class 10 Science Sample Paper 2023 Set B
2022
CBSE Class 10 Science Sample Paper Solved 2022 Set A
CBSE Class 10 Science Sample Paper Solved 2022 Set B
CBSE Class 10 Science Sample Paper Solved 2022 Set C
CBSE Class 10 Science Term 1 Sample Paper Solved 2022
CBSE Class 10 Science Term 2 Sample Paper Solved 2022 Set A
CBSE Class 10 Science Term 2 Sample Paper Solved 2022 Set B
CBSE Class 10 Science Term 2 Sample Paper Solved 2022 Set C
2021
CBSE Class 10 Science Boards 2021 Sample Paper Solved
CBSE Class 10 Science Sample Paper Solved 2021 Set A
CBSE Class 10 Science Sample Paper Solved 2021 Set B
CBSE Class 10 Science Sample Paper Solved 2021 Set C
CBSE Class 10 Science Sample Paper Solved 2021 Set D
CBSE Class 10 Science Sample Paper Solved 2021 Set E
CBSE Class 10 Science Sample Paper Solved 2021 Term 1 Set A
CBSE Class 10 Science Sample Paper Solved 2021 Term 1 Set B
2020
CBSE Class 10 Science Boards 2020 Sample Paper Solved
CBSE Class 10 Science Sample Paper 2020 Set B
CBSE Class 10 Science Sample Paper 2020 Set C
CBSE Class 10 Science Sample Paper 2020 Set D
CBSE Class 10 Science Sample Paper Solved 2020 Set A
2019
CBSE Class 10 Science Sample Paper 2019 Set A
CBSE Class 10 Science Sample Paper 2019 Set B
CBSE Class 10 Science Sample Paper 2019 Set C
CBSE Class 10 Science Sample Paper 2019 Set D
CBSE Class 10 Science Sample Paper 2019 Set E
CBSE Class 10 Science Sample Paper 2019 Set F
CBSE Class 10 Science Sample Paper 2019 Set G
CBSE Class 10 Science Sample Paper 2019 Set H
CBSE Class 10 Science Sample Paper 2019 Solved
2018
CBSE Class 10 Science Sample Paper 2018 Set A
CBSE Class 10 Science Sample Paper 2018 Set C
CBSE Class 10 Science Sample Paper 2018 Set D
CBSE Class 10 Science Sample Paper 2018 Set E
CBSE Class 10 Science Sample Paper 2018 Set F
CBSE Class 10 Science Sample Paper 2018 Set G
CBSE Class 10 Science Sample Paper 2018 Set H
CBSE Class 10 Science Sample Paper 2018 Set I
CBSE Class 10 Science Sample Paper 2018 Set J
CBSE Class 10 Science Sample Paper 2018 Set K
CBSE Class 10 Science Sample Paper 2018 Set L
CBSE Class 10 Science Sample Paper 2018 Solved Set B
2017
CBSE Class 10 Science Sample Paper 2017 Set A
CBSE Class 10 Science Sample Paper 2017 Set B
CBSE Class 10 Science Sample Paper 2017 Set C
CBSE Class 10 Science Sample Paper 2017 Set D
CBSE Class 10 Science Sample Paper 2017 Set E
CBSE Class 10 Science Sample Paper 2017 Set F
CBSE Class 10 Science Sample Paper 2017 Set G
CBSE Class 10 Science Sample Paper 2017 Set H
CBSE Class 10 Science Sample Paper 2017 Set I
CBSE Class 10 Science Sample Paper 2017 Set J
CBSE Class 10 Science Sample Paper 2017 Set K
CBSE Class 10 Science Sample Paper 2017 Set L
2015
CBSE Class 10 Science Sample Paper 2015 Set A
CBSE Class 10 Science Sample Paper 2015 Set B
CBSE Class 10 Science Sample Paper 2015 Set C
CBSE Class 10 Science Sample Paper 2015 Set D
CBSE Class 10 Science Sample Paper 2015 Set E
CBSE Class 10 Science Sample Paper 2015 Set F
CBSE Class 10 Science Sample Paper 2015 Set G
CBSE Class 10 Science Sample Paper 2015 Set H
CBSE Class 10 Science Sample Paper 2015 Set I
CBSE Class 10 Science Sample Paper 2015 Set J
CBSE Class 10 Science Sample Paper 2015 Set K
CBSE Class 10 Science Sample Paper 2015 Set L
2014
CBSE Class 10 Science Sample Paper 2014 Set A
CBSE Class 10 Science Sample Paper 2014 Set B
CBSE Class 10 Science Sample Paper 2014 Set C
CBSE Class 10 Science Sample Paper 2014 Set D
CBSE Class 10 Science Sample Paper 2014 Set E
CBSE Class 10 Science Sample Paper 2014 Set F
CBSE Class 10 Science Sample Paper 2014 Set G
CBSE Class 10 Science Sample Paper 2014 Set H
CBSE Class 10 Science Sample Paper 2014 Set I
CBSE Class 10 Science Sample Paper 2014 Set J
CBSE Class 10 Science Sample Paper 2014 Set K
CBSE Class 10 Science Sample Paper 2014 Set L
CBSE Class 10 Science Sample Paper 2014 Set M
CBSE Class 10 Science Sample Paper 2014 Set N
2013
CBSE Class 10 Science Sample Paper 2013 Set A
CBSE Class 10 Science Sample Paper 2013 Set B
CBSE Class 10 Science Sample Paper 2013 Set C
CBSE Class 10 Science Sample Paper 2013 Set D
CBSE Class 10 Science Sample Paper 2013 Set E
CBSE Class 10 Science Sample Paper 2013 Set F
CBSE Class 10 Science Sample Paper 2013 Set G
CBSE Class 10 Science Sample Paper 2013 Set H
CBSE Class 10 Science Sample Paper 2013 Set I
CBSE Class 10 Science Sample Paper 2013 Set J
CBSE Class 10 Science Sample Paper 2013 Set K
CBSE Class 10 Science Sample Paper 2013 Set L
2012
CBSE Class 10 Science Sample Paper 2012 Set A
CBSE Class 10 Science Sample Paper 2012 Set B
CBSE Class 10 Science Sample Paper 2012 Set C
CBSE Class 10 Science Sample Paper 2012 Set D
CBSE Class 10 Science Sample Paper 2012 Set E
CBSE Class 10 Science Sample Paper 2012 Set F
CBSE Class 10 Science Sample Paper 2012 Set G
CBSE Class 10 Science Sample Paper 2012 Set H
CBSE Class 10 Science Sample Paper 2012 Set I
* More Sample Papers
CBSE Class 10 Science Chapter Weightage
CBSE Class 10 Science Practical Skills Sample Paper Set A
CBSE Class 10 Science Practical Skills Sample Paper Set B
CBSE Class 10 Science Practical Skills Sample Paper Set C
CBSE Class 10 Science Sample Paper Set A
CBSE Class 10 Science Sample Paper Set B
CBSE Class 10 Science Sample Paper Set C
CBSE Class 10 Science Sample Paper Set D
CBSE Class 10 Science Sample Paper Set E
CBSE Class 10 Science Sample Paper Set F
CBSE Class 10 Science Sample Paper Set G
CBSE Class 10 Science Sample Paper Set H
CBSE Class 10 Science Sample Paper Set I
CBSE Class 10 Science Sample Paper Set J
CBSE Class 10 Science Sample Paper Set K
CBSE Class 10 Science Sample Paper Set L
CBSE Class 10 Science Sample Paper Set M
CBSE Class 10 Science Sample Paper Set N Solved

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How to download CBSE Class 10 Science Sample Paper Solved 2021 Set D in PDF?

Students can easily download the CBSE Class 10 Science Sample Paper Solved 2021 Set D from our website to prepare for their upcoming examinations. To score high marks, it is important for Class 10 students to understand the exaact pattern as per which teachers design the question papers. We strongly suggest that you practice these latest sample papers for Science and solve different types of questions that are expected to come this year. You can downloadin PDF format so that you can practice offline. We also recommend that Class 10 students solve these papers actual exam conditions at home.

Why should you solve CBSE Class 10 Science Sample Paper Solved 2021 Set D?

Practicing these model papers has several benefits for Class 10 students:

  • New Question Bank: This set has fresh questions for Science which are different from previous years.
  • Exam Pattern Knowledge: Solving more sets will help you to understand the weightage of each chapter in Class 10 and also the type of questions asked.
  • Identify Weak Areas: Comparing your score in each set to find out topics in Class 10 Science for which you need hard work.
  • Speed and Accuracy: Attempting MCQ questions and long-form problems for Class 10 Science makes you faster and better and you will be able to finish your exam on time.

What should you do after solving CBSE Class 10 Science Sample Paper Solved 2021 Set D?

  1. Check Your Work: Match your answers with the solutions given by our teachers in the Science Sample Paper PDF.
  2. Learn from Mistakes: Class 10 students should focus on the questions which you solved incorrectly and understand the error.
  3. Revision: If you find a question difficult you shoul refer to NCERT book for Class 10 Science to understand concepts and then try the question again.
  4. Continuous Practice: Solve multiple sets of Science sample papers from studiestoday.com to build confidence before the CBSE exams.
Where can I download the PDF for CBSE Class 10 Science Sample Paper Solved 2021 Set D?

You can download the complete PDF for CBSE Class 10 Science Sample Paper Solved 2021 Set D for free from StudiesToday.com. Our resources for Class 10 Science are updated for the latest academic session and follow the official exam pattern.

Are solutions provided for CBSE Class 10 Science Sample Paper Solved 2021 Set D?

Yes, CBSE Class 10 Science Sample Paper Solved 2021 Set D comes with detailed, teacher-verified solutions. We have provided step-by-step answers for Science to help students of Class 10 understand correct methodology and marking scheme.

How can practicing CBSE Class 10 Science Sample Paper Solved 2021 Set D help in exam preparation?

Practicing this Science paper helps in time management and identifying important topics. For Class 10, solving mock papers is the best way to gain confidence and reduce exam-day anxiety.

Is the CBSE Class 10 Science Sample Paper Solved 2021 Set D accessible on mobile and tablets?

Yes, all our study materials for Class 10 Science are provided in a mobile-friendly PDF format. You can easily download CBSE Class 10 Science Sample Paper Solved 2021 Set D on your mobile device.