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CBSE Class 10th Board Science exam was conducted on February 20, 2025. The question paper along with the solution PDF is available here to download along with solutions in pdf form.
The CBSE 10th Board Science exam is divided into five sections, A, B, C, D, and E. The total marks for the A Section is 20. For B and C sections it is of 12 marks and 21 marks, respectively. The D and E sections is of 15 marks and 12 marks each. CBSE Class 10 Science Question Paper 2025 is total of 80 marks.
CBSE Board Class 10 Science Question Paper 2025 Set 2(31-4-2) with Solutions
| CBSE Class 10 Science 2024 Question Paper with Answer Key (Set 2 31/4/2) |  Download |
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To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be:
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When a pure-tall pea plant is crossed with a pure-dwarf pea plant, the percentage of tall pea plants in F1 and F2 generation pea plants will be respectively:
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Plants like rose and banana have lost the capacity to produce:
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In which one of the following situations a chemical reaction does not occur?
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The property by virtue of which a solid material can be drawn into thin wires is called:
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In order to prepare dry hydrogen chloride gas in a humid atmosphere, the gas produced is passed through a guard tube (drying tube) which contains:
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Select from the following a hydrocarbon having one C-C bond and one C=C bond:
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Which one of the following has half the number of chromosomes and half the amount of DNA as compared to the non-reproductive body cells?
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The essential element taken up from the soil by the plants to synthesize proteins is:
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Select TRUE statements about lymph from the following:
A. Lymph vessels carry lymph through the body and finally open into larger arteries.
B. Lymph contains some amount of plasma, proteins and blood cells.
C. Lymph contains some amount of plasma, proteins and red blood cells.
D. Lymph vessels carry lymph through the body and finally open into larger veins.
The true statements are:
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Which one of the following gets biomagnified at different levels in a food chain?
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In the food chains given below, select the most efficient food chain in terms of energy:
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An optical device ‘X’ is placed obliquely in the path of a narrow parallel beam of light. If the emergent beam gets displaced laterally, the device ‘X’ is:
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A piece of wire of resistance 'R' is cut lengthwise into three identical parts. These parts are then connected in parallel. If the equivalent resistance of this combination is \( R' \), then the value of \( R/R' \) is:
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The minimum number of identical bulbs of rating 4V, 6W, that can work safely with desired brightness, when connected in series with a 240V mains supply is:
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An electric bulb is rated 220V, 11W. The resistance of its filament when it glows with a power supply of 220V is:
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Assertion (A): All exothermic reactions are accompanied with evolution of heat and light.
Reason (R): Combination reactions may or may not be exothermic.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Assertion (A): When ciliary muscles contract, eye lens becomes thin.
Reason (R): Ciliary muscles control the power of the eye lens.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Assertion (A): Concentrated nitric acid is diluted by adding water slowly to acid with constant stirring.
Reason (R): Concentrated nitric acid is easily soluble in water.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Assertion (A): In reptiles, the temperature at which the fertilized eggs are kept decides the sex of the offspring.
Reason (R): Sex is not genetically determined in some animals.
In the light of the above statements, choose the most appropriate answer from the options given below:
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While burning a magnesium ribbon in air, list two safety measures which should be followed. Also state two observations of this activity.
(a) Draw a ray diagram to show the refraction of a ray of light passing through an equilateral glass prism. Mark the angle through which the emergent ray bends from the direction of the incident ray and also name it.
(b) Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.
In human alimentary canal the small intestine is designed to absorb the digested food. Justify this statement.
Pure-tall (TT) pea plants are crossed with pure-dwarf (tt) pea plants. The pea plants obtained in F1 generation are then self-pollinated to produce F2 generation.
(i) What do the plants of F1 generation look like? Justify your answer.
(ii) What is the ratio of pure-tall plants to pure-dwarf plants in F2 generation?
(a) Show the formation of magnesium chloride by electron transfer. Write the name of the cation and anion present in the compound formed. (Atomic Number of Mg = 12, Cl = 17)
(b) How is zinc extracted from its ore? Name the processes involved in the extraction and write chemical equations for the reactions that occur during these processes.
State the role of an electric fuse, used in series with an electrical appliance. Why should in an electric circuit a fuse with defined rating not be replaced by one with a larger rating?
What are decomposers? Give two examples. State how they maintain a balance in an ecosystem.
Samples of four metals A, B, C, and D were added one by one to the following solutions. The results obtained were tabulated as follows:
Use the table above to answer the following questions about metals A, B, C, and D:
(i) Which is the least reactive metal?
(ii) What would be observed if C is added to a solution of copper sulphate?
(iii) Arrange the metals A, B, C, and D in the order of their decreasing reactivity.
(i) Study the diagram and name the parts marked as A, B, C, and D.
(ii) Write the function of A and C.
The electrical resistivity of three materials A, B, and C at 20°C is given below:
Material A: Resistivity \(10^{17} \Omega \, m\)
Material B: Resistivity \(44 \times 10^{-6} \Omega \, m\)
Material C: Resistivity \(1.62 \times 10^{-8} \Omega \, m\)
(i) Classify these materials as conductor, alloy, and insulator.
(ii) Give one example of each of these materials and state one use of each material in the design of an electrical appliance, say an electric stove or an electric iron.
If we want to obtain a real and magnified image of an object by using a concave mirror of focal length 18 cm. Where should the object be placed? Use mirror formula to determine the object distance for an image of magnification -2 by this mirror to justify your answer.
(a) Why do we balance a chemical equation? Name and state the law that suggests the balancing of a chemical equation. Balance the following chemical equation:
\[ Zn + H_3 PO_4 \rightarrow Zn_3 (PO_4)_2 + H_2 \]
(b) Define a precipitation reaction. Give its example and also express the reaction that occurs in the form of a balanced chemical equation.
State two limitations of electrical impulses in multicellular organisms. Why is chemical communication better than electrical impulses as a means of communication between cells in multicellular organisms?
What are structural isomers? Draw structural isomers of butane (\( C_4H_{10} \)). Give reason why propane has no structural isomers.
What happens when butane is burnt in air? Write the chemical equation for the reaction. Differentiate between the flames obtained when butane and butyne both are burnt in air in similar conditions.
Give reason why carbon can neither form \( C^{4+} \) cations nor \( C^{4-} \) anions but forms covalent compounds.
What is meant by functional group in carbon compounds? Write in tabular form the structural formula and the functional group present in the following compounds:
(a) Ethanol
(b) Ethanoic acid
Draw the pattern of the magnetic field lines for the two parallel straight conductors carrying current of same magnitude 'I' in opposite directions as shown. Show the direction of magnetic field at a point O which is equidistant from the two conductors. (Consider that the conductors are inserted normal to the plane of a rectangular cardboard.)
In our houses we receive A.C. electric power of 220 V. In electric iron or electric heater cables having three wires with insulation of three different colours – red, black and green are used to draw current from the mains.
What are these three different wires called? Name them colourwise.
What is the potential difference between the red wire and the black wire?
What is the role of the wire with green insulation in case of accidental leakage of electric current to the metallic body of an electrical appliance?
By using the given experimental set-up, how can it be shown that:
A force is exerted on the current-carrying conductor AB when it is placed in a magnetic field.
The direction of the force can be reversed in two ways.
When will the magnitude of the force be highest?
State Fleming's left-hand rule.
What is regeneration? Give one example of an organism that shows this process and one organism that does not. Why does regeneration not occur in the latter?
Water in a pond appears dark green and contains filamentous structures. Name these structures and the method by which they reproduce. Explain the process.
Name the part performing the following functions in the human male reproductive system:
(a) Carries sperm
(b) Production of male gametes
(c) Whose secretion makes the transport of sperm easier
(d) Provides suitable temperature for sperm formation
Write any two characteristics of sperm.
What are surgical contraceptive methods? Give the side effect caused by this procedure.
The students in a class took a thick sheet of cardboard and made a small hole in its centre. Sunlight was allowed to fall on this small hole and they obtained a narrow beam of white light. A glass prism was taken and this white light was allowed to fall on one of its faces. The prism was turned slowly until the light that comes out of the opposite face of the prism appeared on the nearby screen. They studied this beautiful band of light and concluded that it is a spectrum of white light
(i) Give any one more instance in which this type of spectrum is observed.
What happens to white light in the above case?
List two conditions necessary to observe a rainbow.
Draw a ray diagram to show the formation of a rainbow. Mark on it, points (a), (b) and (c) as given below:
(a) Where dispersion of light occurs.
(b) Where light gets reflected internally.
(c) Where final refraction occurs.
Common salt is a very important chemical compound for our daily life. It’s chemical name is sodium chloride and it is used as a raw material in the manufacture of caustic soda, washing soda, baking soda etc. It is also used in the preservation of pickles, butter, meat etc.
(i) Name the acid and the base from which common salt can be obtained.
(ii) State the nature (acidic/basic/neutral) of sodium chloride. Give reason for the justification for your answer.
(iii) (A) What happens when electric current is passed through an aqueous solution of sodium chloride (called brine)? Name the products obtained along with the corresponding places in the electrolytic cell where each of these products is obtained.
How is washing soda obtained from sodium chloride? Give the chemical equations of the reactions involved in the process.
In life, there are certain changes in the environment called ‘stimuli’ to which we respond appropriately. Touching a flame suddenly is a dangerous situation for us. One way is to think consciously about the possibility of burning and then moving the hand. But our body has been designed in such a way that we save ourself from such situations immediately.
Name the action by which we protect ourselves in the situation mentioned above and define it.
Write the role of (a) motor and (b) relay neuron.
What are the two types of nervous system in the human body? Name the components of each of them.
Which part of the human brain is responsible for:
(a) thinking
(b) picking up a pencil
(c) controlling blood pressure
(d) controlling hunger
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