CBSE Class 10 Science Sample Paper 2023
CBSE Class 10 Science Sample Paper 2023: CBSE has released Class 10 Science Sample Paper 2023 and students must buckle up their preparation by revising the complete syllabus, mock tests, and practice papers. In all these, the students must not skip the official CBSE Class 10 Science Paper in order to understand the pattern and plan a strategy to solve the questions in the given time duration. For providing a helping hand to the students, CBSE has released the Class 10 Science Sample Paper 2023 PDF set in the official format along with all subjects' CBSE Class Sample Paper 2022-23. The sample papers have been uploaded on the CBSE Academic official website www.cbseacademic.nic.in and we have also provided the direct links in this article. Download Class 10th Science Sample Paper 2022-2023 and prepare according to the latest pattern.
Class 10 Science Sample Paper 2023
As CBSE Class 10 Session 2022-2023 has begun and students must go through the CBSE Class 10 Science Sample Paper 2023 released by CBSE for the academic year 2022-23. The CBSE Class 10 Science Board Exam will be of descriptive nature for which the time allotted is 3 hours for 39 questions. The question paper consists of 39 questions divided into 5 sections.
1. Section A consists of 20 objective-type questions carrying 1 mark each.
2. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should in the range of 30 to 50 words.
3. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should in the range of 50 to 80 words
4. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answers to these questions should be in the range of 80 to 120 words.
5. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts.
Class 10 Science Sample Paper 2023 PDF
The students who are studying for CBSE Class 10 Science 2023 Examination can download the official Class 10 Science Sample Paper PDF from the below link and practice the questions as per the pattern released by CBSE along with the solution.
|Class 10 Science Sample Paper with Solutions|
|Class 10 Science Sample Paper 2023 [Official]||Solution Link|
Class 10 Science Sample Paper and Solution 2023
Section A consists of 20 objective-type questions carrying 1 mark each.
Select and write one most appropriate option out of the four options given for each of the questions
Question 1. The change in color of the moist litmus paper in the given setup is due to
i. presence of acid
ii. presence of base
iii. presence of H⁺(aq) in the solution
iv. presence of Litmus which acts as an indicator
(a) i and ii
(b) Only ii
(c) Only iii
(d) Only iv
Solution: (c) Only iii
Question 2. In the redox reaction
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
(a) MnO2 is reduced to MnCl2& HCl is oxidized to H2O
(b) MnO2 is reduced to MnCl2& HCl is oxidized to Cl2
(c) MnO2 is oxidized to MnCl2 & HCl is reduced to Cl2
(d) MnO2 is oxidized to MnCl2 & HCl is reduced to H2O
Solution: (b) MnO2 is reduced to MnCl2 & HCl is oxidized to Cl2
Question 3. Which of the following is the correct observation of the reaction shown in the above setup?
(a) Brown powder of Magnesium oxide is formed.
(b) Colourless gas which turns lime water milky is evolved.
(c) Magnesium ribbon burns with brilliant white light.
(d) Reddish brown gas with a smell of burning Sulphur has evolved.
Solution: (c) Magnesium ribbon burns with brilliant white light
Question 4. With the reference to four gases CO2, CO, Cl2, and O2, which one of the options in the table is correct?
|Option||Acidic oxide||Used in the treatment of water||Product of respiration||Product of incomplete combustion|
Solution: (b) CO2, Cl2, CO2, CO
Question 5 . On placing a copper coin in a test tube containing green ferrous sulfate solution, it will be observed that the ferrous sulfate solution
(a) turns blue, and a grey substance is deposited on the copper coin.
(b) turns colorless and a grey substance is deposited on the copper coin.
(c) turns colorless and a reddish-brown substance is deposited on the copper coin.
(d) remains green with no change in the copper coin.
Solution: (d) Ferrous sulfate solution remains green with no change in the copper coin.
Question 6. Anita added a drop each of diluted acetic acid and diluted hydrochloric acid on pH paper and compared the colors. Which of the following is the correct conclusion?
(a) a pH of acetic acid is more than that of hydrochloric acid.
(b) a pH of acetic acid is less than that of hydrochloric acid.
(c) Acetic acid dissociates completely in an aqueous solution.
(d) Acetic acid is a strong acid
Solution: (a) Only i
Question 7. The formulae of four organic compounds are shown below.
Choose the correct option
(a) A and B are unsaturated hydrocarbons
(b) C and D are saturated hydrocarbons
(c) Addition of hydrogen in presence of catalyst changes A to C
(d) Addition of potassium permanganate changes B to D
Solution: (c) Addition of hydrogen in presence of a catalyst changes A to C
Question 8. In the given transverse section of the leaf identify the layer of cells where maximum photosynthesis occurs.
(a) I, II
(b) II, III
(c) III, IV
(d) I, IV
Solution: (b) II,III
Question 9. Observe the experimental setup shown below. Name the chemical indicated as ‘X’ that can absorb the gas which is evolved as a byproduct of respiration.
(c) Ca (OH)2
Question 10. If a tall pea plant is crossed with a pure dwarf pea plant then, what percentage of F1 andF2 generation respectively will be tall?
(a) 25%, 25%
(b) 50%, 50%
(d) 100%, 75%
Question 11. Observe the three figures given below.
Which of the following depicts tropic movements appropriately?
(a) B and C
(b) A and C
(c) B only
(d) C only
Solution: (d) C only
Question 12. The diagram shown below depicts pollination. Choose the options that will show a maximum variation in the offspring.
(a) A, B, and C
(b) B and D
(c) B, C, and D
(d) A and C
Solution: (b) B and D
Question 13. A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire
(b) remains the same.
(d) increases for some time and then decreases.
Solution: (c) increases
Question 14 A copper wire is held between the poles of a magnet The current in the wire can be reversed. The pole of the magnet can also be changed over. In how many of the four directions shown can the force act on the wire?
Solution: (b) 2 (Either North or South)
Question 15. Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance of the wire would be produced by an increase in the
(a) length l of the wire
(b) diameter d of the wire
(c) the temperature of the wire
(d) the thickness of the plastic insulation
Solution: (b) diameter d of the wire
Question 16 Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?
(a) straight lines perpendicular to the wire.
(b) straight lines parallel to the wire.
(c) radial lines originating from the wire.
(d) concentric circles centered around the wire.
Solution: (d) The field consists of concentric circles centered around the wire
Q. no 17 to 20 are Assertion - Reasoning based questions.
These consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is False but R is true
Question 17. Assertion: Silver bromide decomposition is used in black-and-white photography.
Reason: Light provides energy for this exothermic reaction.
Solution: (c) A is true but R is false
Question 18 Assertion: Height in pea plants is controlled by the efficiency of enzymes and is thus genetically controlled.
Reason: Cellular DNA is the information source for making proteins in the cell.
Solution: (a) Both A and R are true and R is the correct explanation of A
Question 19. Assertion: Amphibians can tolerate the mixing of oxygenated and deoxygenated blood.
Reason: Amphibians are animals with a two-chambered heart
Solution: (c) A is true but R is false
Question 20. Assertion: On freely suspending a current–carrying solenoid, it comes to rest in a geographical N-S direction.
Reason: One end of the current carrying a straight solenoid behaves as a North pole and the other end as a South pole, just like a bar magnet.
Solution: (a) Both A and R are true and R is the correct explanation of A
Question 21. A clear solution of slaked lime is made by dissolving Ca(OH)2in an excess of water. This solution is left exposed to air. The solution slowly goes milky as a faint white precipitate form. Explain why faint white precipitate forms, and support your response with the help of a chemical equation.
Solution: Calcium hydroxide reacts with Carbon dioxide present in the atmosphere to form Calcium carbonate which results in milkiness/white ppt / Formation of Calcium carbonate
Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
Keerti added dilute Hydrochloric acid to four metals and recorded her observations as shown in the table given below
Select the correct observation(s) and give chemical equation(s) of the reaction involved
Solution: Fe + HCl → FeCl₂/ FeCl₃ + H₂ (1mark) (No deduction for balancing/ states) Zn + HCl → ZnCl₂ + H₂
Question 22. How is the mode of action in the beating of the heart different from reflex actions? Give four examples.
Question 23. Patients whose gallbladders are removed are recommended to eat less oily food. Why?
Solution: The gallbladder stores bile which helps in the emulsification of lipids. In the absence of stored bile, emulsification of fats will be negligible/ affected/ less and thus fat digestion will be slow. Hence there are such diet restrictions.
Question 24. Name the substances other than water, that are reabsorbed during urine formation. What are the two parameters that decide the amount of water that is reabsorbed in the kidney
Solution: Glucose, amino acids, salts (any 2, 1 mark each), and a major amount of water are selectively re-absorbed as the urine flows along the tube. The amount of water reabsorbed depends on how much excess water there is in the body (0.5 marks), and on how much-dissolved waste there is to be excreted (0.5marks)
Question 25. State the phenomena observed in the below diagram. Explain with reference to the diagram, which of the two lights mentioned above will have the higher wavelength.
Solution: Dispersion- The splitting of white light into seven colors on passing through a prism. (1 mark) Velocity is directly proportional to wavelength given constant frequency. So yellow will have a greater wavelength than blue as the velocity of yellow light is greater than blue.
How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw the diagram
Solution: The angle of deflections of the two prisms needs to be equal and opposite. While the first prism splits the light in the seven colors due to different angles of deflection, the second prism combines the spectrum along a single ray and the colors again combine to give white light as the emergent light. (1mark)
Question 26. A lot of waste is generated in the neighborhood. However, almost all of it is biodegradable. What impact will it have on the environment or human health?
Solution: Excess generation of biodegradable wastes can be harmful as - Its decomposition is a slow process leading to the production of foul smells and gases. (1mark) It can be the breeding ground for germs that create unhygienic conditions.
Question 27. Identify the types of reaction mentioned above in (i) and (ii). Give one example for each type in the form of a balanced chemical equation.
Solution: i) Displacement - ½ M
● Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) (1 mark)
● Zn(s) + CuSO4(aq)→ ZnSO4(aq) + Cu(s)
● Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s)
(Any one of the reactions or other displacement reactions.)
ii) Double displacement (½ mark)
Na2SO4 (aq) + BaCl2(aq) → BaSO4 (s) + 2NaCl(aq) (1 mark)
(Any one of the reactions or other double displacement reactions.)
28. (a) Identify the gasses that evolved at the anode and cathode in the above experimental setup.
(b) Name the process that occurs. Why is it called so?
(c) Illustrate the reaction of the process with the help of a chemical equation.
Solution: (a) Anode: Chlorine; Cathode: Hydrogen
(b) Chlor alkali process as the products obtained are alkali, chlorine gas, and hydrogen gas Electric current
(c) 2NaCl(aq) + 2H2O(l)→ 2NaOH(aq) + Cl2 (g) + H2 (g)
Question 29. The leaves of a plant were covered with aluminum foil, how would it affect the physiology of the plant?
Solution: No photosynthesis will occur so no glucose will be made. Also, no respiration will take place as no Oxygen will be taken in.
No transpiration will occur so there would be no upward movement of water or minerals from the soil as there will be no transpirational pull.
Temperature regulation of the leaf surface will be affected.
How is lymph an important fluid involved in transportation? If lymphatic vessels get blocked, how would it affect the human body? Elaborate.
Solution: Lymph carries digested and absorbed fat from the intestine and drains excess fluid from extracellular space back into the blood. Blockage of the lymphatic system will lead to water retention and poor fat absorption in the body
Question 30. Rohit wants to have an erect image of an object using a converging mirror of focal length 40 cm.
(a) Specify the range of distance where the object can be placed in front of the mirror. Justify.
(b) Draw a ray diagram to show the image formation in this case.
(c) State one use of the mirror based on the above kind of image formation.
Solution: (a) The object has to be placed at a distance between 0 - 40 cm. This is because the image is virtual, erect, and magnified when the object is placed between F and P
(c)Used as a shaving mirror or used by dentists to get enlarged images of teeth.
Question 31. (a) A lens of focal length 5 cm is being used by Debashree in the laboratory as a magnifying glass. Her least distance of distinct vision is 25 cm.
(i) What is the magnification obtained by using the glass?
(ii) She keeps a book at a distance of 10 cm from her eyes and tries to read. She is unable to read. What is the reason for this?
(b) Ravi kept a book at a distance of 10 cm from the eyes of his friend Hari. Hari is not able to read anything written in the book. Give reasons for this.
Solution: (b) This is because the least distance of distinct vision is 25 cm
Question 32. A student fixes a white sheet of paper on a drawing board. He places a bar magnet in the center and sprinkles some iron filings uniformly around the bar magnet. Then he taps gently and observes that iron filings arrange themselves in a certain pattern.
(a) Why do iron filings arrange themselves in a particular pattern?
(b) Which physical quantity is indicated by the pattern of field lines around the bar magnet?
(c) State any two properties of magnetic field lines.
Solution: (a) When iron filings are placed in a magnetic field around a bar magnet, they behave like tiny magnets. The magnetic force experienced by these tiny magnets makes them rotate and align themselves along the direction of field lines. (1 mark)
(b)The physical property indicated by this arrangement is the magnetic field produced by the bar magnet. (1 mark)
(c) Magnetic field lines never intersect, magnetic field lines are closed curves.
A compass needle is placed near a current-carrying wire. State your observations for the following cases and give reasons for the same in each case-
(a) Magnitude of electric current in a wire is increased.
(b) The compass needle is displaced away from the wire.
Solution: (a) The deflection in the compass needle increases as the Magnetic field of the current carrying conductor is directly proportional to the current flowing through it.
(b) The deflection in the needle decreases as the magnetic field is inversely proportional to the perpendicular distance from the wire.
Question 33. Why is damage to the ozone layer a cause for concern? What are its causes and what steps are being taken to limit this damage?
Solution: Damage to the ozone layer is a cause for concern because the ozone layer shields the surface of the earth from harmful UV radiations from the sun which cause skin cancer in human beings. Synthetic chemicals like chlorofluorocarbons (CFCs) which are used as refrigerants and fire - extinguishers are the main reason for the depletion of the ozone layer. Steps were taken to limit this damage - Many developing and developed countries have signed and are obeying the directions of UNEP (United Nations Environment Program) to freeze or limit the production and usage of CFCs at 1986 levels.
Question 34. Shristi heated Ethanol with compound A in presence of a few drops of concentrated sulphuric acid and observed a sweet-smelling compound B formed. When B is treated with sodium hydroxide it gives back Ethanol and a compound C.
(a) Identify A and C
(b) Give one use for each of the compounds A and B.
(c) Write the chemical reactions involved and name the reactions.
Solution: (a) A – Ethanoic acid/ Or any other carboxylic acid , C- Sodium salt of ethanoic acid/ any other carboxylic acid/ sodium ethanoate
(b) Use of A- dil solution used as vinegar in cooking/ preservative in pickles
Use of B – making perfumes, flavoring agent
(c) CH3COOH + C2H5OH ----------------> CH3COOC2H5 +H2O
CH3COOC2H5 + NaOH----------------> CH3COONa + C2H5OH
(a) What is the role of concentrated Sulphuric acid when it is heated with ethanol at 443 K. Give the reaction involved.
(b) Reshu by mistake forgot to label the two test tubes containing Ethanol and Ethanoic acid. Suggest an experiment to identify the substances correctly. Illustrate the reactions with the help of chemical equations
Solution: (a) Sulphuric acid acts as a dehydrating agent
Conc H2SO4, 443K
C2H5OH —--------------------> C2H4 + H2O (1mark)
(b) By reaction with sodium carbonate/ bicarbonate 1M with the samples, ethanol will not react whereas ethanoic acid gives brisk effervescence
2CH3COOH + Na2 CO3 → 2CH3COONa + H2O+ CO2
CH3COOH + NaHCO₃ → CH₃COONa + H2O + CO2
Question 35. (a) Why is it not possible to reconstruct the whole organism from a fragment in complex multicellular organisms?
(b) Sexual maturation of reproductive tissues and organs is necessary to link for reproduction. Elucidate.
Solution: (a) The reason is that many multi-cellular organisms are not simply a random collection of cells. Specialized cells are organized as tissues, and tissues are organized into organs, which then have to be placed at definite positions in the body. Therefore, the cell-by-cell division would be impractical.
(b) Sexual maturation of reproductive tissues is a necessary link for reproduction because of the need for specialized cells called germ cells to participate in sexual reproduction. The body of the individual organism has to grow to its adult size, the rate of general body growth begins to slow down, and reproductive tissues begin to mature. A whole new set of changes in the appearance of the body takes place like changes in body proportions, and new features appear. This period during adolescence is called puberty. There are also changes taking place that are different between boys and girls. In girls, breast size begins to increase, with darkening of the skin of the nipples at the tips of the breasts. Also, girls begin to menstruate at around this time. Boys begin to have new thick hair growth on their faces and their voices begin to crack.
(a) How are variations useful for species if there is a drastic alteration in the niches?
(b) Explain how the uterus and placenta provide necessary conditions for proper growth and development of the embryo after implantation?
Solution: (a) If the niche were drastically altered, the population could be wiped out. However, if some variations were to be present in a few individuals in these populations, there would be some chance for them to survive. Variation is thus useful for the survival of species over time.
(b)● The lining of the uterus thickens and is richly supplied with blood to nourish the growing embryo.
● The embryo gets nutrition from the mother’s blood with the help of the placenta. It is embedded in the uterine wall.
● It contains villi on the embryo’s side of the tissue. On the mother’s side are blood spaces, which surround the villi.
● This provides a large surface area for glucose and oxygen to pass from the mother to the embryo. The developing embryo will also generate waste substances which can be removed by transferring them into the mother’s blood through the placenta.
● The child is born as a result of rhythmic contractions of the muscles in the uterus.
Question 36. The diagram above is a schematic diagram of a household circuit. The house shown in the above diagram has 5 usable spaces where electrical connections are made. For this house, the mains have a voltage of 220 V and the net current coming from the mains is 22A.
(a) What is the mode of connection to all the spaces in the house from the mains?
(b) Spaces 5 and 4 have the same resistance and spaces 3 and 2 have respective resistances of 20Ω and 30Ω. Space 1 has a resistance double that of space 5. What is the net resistance for space?
(c) What is the current in space 3?
(d) What should be placed between the main connection and the rest of the house’s electrical appliances to save them from accidental high electric current?
Solution: (a) All spaces are connected in parallel.
(b) Let the Resistance of Space 5 and 4 be R ohms respectively
Resistance of Space 1 = 2 R ohms
Resistance of Space 2 = 30 ohms
Resistance of Space 3 = 20 ohms
Current = 22 A
V= 220 V
Total Resistance= V/I
Question 37. Two students decided to investigate the effect of water and air on iron objects under identical experimental conditions. They measured the mass of each object before placing it partially immersed in 10 ml of water. After a few days, the object was removed and dried and their masses were measured. The table shows their results
|Student||Object||Mass of Object before Rusting in g||Mass of the coated object in g|
(a) What might be the reason for the varied observations of the two students?
(b) In another set up the students coated iron nails with zinc metal and noted that iron nails coated with zinc prevent rusting. They also observed that zinc initially acts as a physical barrier, but an extra advantage of using zinc is that it continues to prevent rusting even if the layer of zinc is damaged. Name this process of rust prevention and give any two other methods to prevent rusting.
Solution: a) Rusting occurs in both A and B so there is an increase in mass. As the surface area of B is more, the extent of rusting is more
b) Galvanization, Oiling/ greasing/ painting/ alloying/ chromium plating or any other
(b) In which of the following applications of Iron, rusting will occur most? Support your answer with valid reasons.
A - Iron Bucket electroplated with Zinc
B - Electricity cables having iron wires covered with aluminum
C - Iron hinges on a gate
D - Painted iron fence
Solution: b) C - Iron hinges on a gate - Iron is in contact with both atmospheric oxygen and moisture/ water vapor.
Question 38. Pooja has green eyes while her parents and brother have black eyes. Pooja’s husband Ravi has black eyes while his mother has green eyes and father has black eyes.
(a) On the basis of the above-given information, is the green eye color a dominant or recessive trait? Justify your answer.
(b) What is the possible genetic makeup of Pooja’s brother’s eye color?
(c) What is the probability that the offspring of Pooja and Ravi will have green eyes? It also shows the inheritance of eye color in the offspring with the help of a suitable cross.
Solution: a. Yes, green eye color is recessive (½ mark) as it will express only in
homozygous condition (½ mark)
b. BB, Bb (1 mark)
c. bb*Bb (0.5mark)
Genetic cross -50% of the offspring can have green eye color.
(c) 50% of the offspring of Pooja’s brother are green-eyed. With help of cross show how this is possible.
Solution: c. Brother is heterozygous(Bb) and wife is green(bb) - (1) Wife bb*Bb brother
50% of the offspring can have green eye color as per the cross shown
Question 39. The above images are that of a specialized slide projector. Slides are small transparencies mounted in sturdy frames ideally suited to magnification and projection since they have a very high resolution and a high image quality. There is a tray where the slides are to be put into a particular orientation so that the viewers can see the enlarged erect images of the transparent slides. This means that the slides will have to be inserted upside down in the projector tray. To show her students the images of insects that she investigated in the lab, Mrs. Iyer brought a slide projector. Her slide projector produced 500 times enlarged and inverted images of a slide on a screen 10 m away.
(a) Based on the text and data given in the above paragraph, what kind of lens must the slide projector have?
(b) If v is the symbol used for image distance and u for object distance then with one reason state what will be the sign for 𝑣 /𝑢
in the given case?
(c) A slide projector has a convex lens with a focal length of 20 cm. The slide is placed upside down 21 cm from the lens. How far away should the screen be placed from the slide projector’s lens so that the slide is in focus?
Solution: (a) Convex Lens
(b) Negative as the image is real and inverted.
(c) 1/f= 1/v- 1/u 1/20 = 1/v- 1/-20 1/v = 1/20 - 1/21 = (21 - 20)/420 = 1/420 v= 420 cm
(c)When a slide is placed 15 cm behind the lens in the projector, an image is formed 3 m in front of the lens. If the focal length of the lens is 14 cm, draw a ray diagram to show image formation. (not to scale)
Steps to download CBSE Class 10 Science Sample Paper 2023
Download the sample paper for class 10 science 2023 with solutions for the board exam by following the below-mentioned steps :
Step I- Visit the official website of CBSE Academic @ www.cbseacademic.nic.in or Click on the CBSE Class 10 Science Sample Paper with Solutions for the Board 2023 Exam mentioned above.
Step II- Click on the notification appearing in the academic section- “Sample Question Papers of Classes X for Session 2022-23”.
Step III- Now click on the link mentioned under “Sample Papers Class X”.
Step IV- The list of all subjects “Class X Sample Question Paper & Marking Scheme for Exam 2023” appears on the screen.
Step V- Click on “SQP” for “Science” and download CBSE Class 10th Science Sample Paper 2023 along with the Solution.
Step VI- Check the marking scheme after attempting each subject CBSE Class 10th Science Sample Paper 2023.