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this pdf contains question paper of class10 2025
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Candidates must write the Q.P. Code on the title page of the answer-book.
Series : 1GEFH SET~ 1
Q.P. Code
Roll No.
(I) Please check that this question paper contains 27 printed pages.
(II) Q.P.^ Code^ given on the^ right hand side of the question paper should be written on the title page of the answer-book by the candidate.
(III) Please check that this question paper contains 39 questions.
(IV) Please^ write^ down^ the^ Serial Number of the question in the answer-book at the given place before attempting it.
(V) 15 minute time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the candidates will read the question paper only and will not write any answer on the answer-book during this period.
विज्ञान
Time allowed : 3 hours Maximum Marks : 80
31/ 1 / 1
D
A
B C
3. The following table shows the pH values of four solutions A, B, C and D on a pH scale :
The solutions A, B, C and D respectively are of a (A) Strong acid, weak acid, neutral, strong base (B) Weak acid, neutral, weak base, strong base (C) Weak acid, neutral, strong base, weak base (D) Weak acid, neutral, strong base, strong acid
4. Consider the following reactions : (i) Dilute hydrochloric acid reacts with sodium hydroxide. (ii) Magnesium oxide reacts with dilute hydrochloric acid. (iii) Carbon dioxide reacts with sodium hydroxide. It is found that in each case : (A) Salt and water is formed. (B) Neutral salts are formed. (C) Hydrogen gas is formed. (D) Acidic salts are formed.
5. Reaction between two elements A and B, forms a compound C. A loses electrons and B gains electrons. Which one of the following properties will not be shown by compound C? (A) It has high melting point. (B) It is highly soluble in water. (C) It has weak electrostatic forces of attraction between its oppositely charged ions. (D) It conducts electricity in its molten state or aqueous solution.
D
B^ C
A
6. The metals obtained from their molten chlorides by the process of electrolytic reduction are : (A) Gold and silver (B) Calcium and magnesium (C) Aluminium and silver (D) Sodium and iron
7. The formation of magnesium oxide is correctly shown in option :
8. Secretion of less saliva in mouth will effect the conversion of : (A) proteins into amino acids (B) fats into fatty acids and glycerol (C) starch into simple sugars (D) sugars into alcohol
9. The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is : (A) Cytokinins (B) Gibberellins (C) Adrenaline (D) Auxins
14. An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is ‘a’ which can be corrected by lens ‘b’, then ‘a’ and ‘b’ respectively are : (A) hypermetropia and convex lens (B) presbyopia and bifocal lens (C) myopia and concave lens (D) myopia and bifocal lens
15. Which of the following groups do not constitute a food chain? (i) Wolf, rabbit, grass, lion (ii) Plankton, man, grasshopper, fish (iii) Hawk, grass, snake, grasshopper, frog (iv) Grass, snake, wolf, tiger (A) (i) and (iv) (B) (i) and (iii) (C) (ii) and (iii) (D) (ii) and (iv) 16. The percentage of solar energy which is not converted into food energy by the leaves of green plants in a terrestrial ecosystem is about : (A) 1% (B) 10% (C) 90 % (D) 99%
For Questions number 17 to 20, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true. 17. Assertion (A) : Decomposition reactions are generally endothermic reactions. Reason (R) : Decomposition of organic matter into compost is an exothermic process.
18. Assertion (A) : A human child bears all the basic features of human beings. Reason (R) : It looks exactly like its parents, showing very little variations. 19. Assertion (A) : No two magnetic field lines are found to cross each other. Reason (R) : The compass needle cannot point towards two directions at the point of intersection of two magnetic field lines. 20. Assertion (A) : The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R) : The oxygen atoms combine with molecular oxygen to form ozone. SECTION B Questions no. 21 to 26 are Very Short Answer Type questions. 21. A student performs the following experiment in his school laboratory.
List two observations to justify that in this experiment a chemical change has taken place. 2 22. Draw labelled diagrams to show different stages of budding in Hydra. 2 23. (a) Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel? Name the component of blood which helps in this process and state how this component perform this function. 2 OR (b) (i) The transport system in plants is relatively slower than in animals. Give reasons. (ii) State the role of phloem in the transport of materials in plants. 2
29. Plants have neither a nervous system nor muscles, even then they respond to stimuli. For example, the leaves of chhui-mui (touch-me-not) plant when touched begin to fold up and droop. (a) How is the information communicated in ‘‘touch-me-not’’ plants? (b) What enables the plant cells to bring out the observable response? (c) Differentiate the movement mentioned above from the movement of tendrils in a pea plant. 3
30. (a) What are chromosomes? (b) Explain in brief how stability of DNA content of a species is ensured in sexually reproducing organisms? 3
31. Draw ray diagrams to show the nature, position and relative size of the image formed by a convex mirror when the object is placed (i) at infinity and (ii) between infinity and pole P of the mirror. 3
32. Consider the following electric circuit :
Calculate the values of the following : 3 (a) The total resistance of the circuit (b) The total current drawn from the source (c) Potential difference across the parallel combination of 10 and 15 resistors
33. (a) Write the relationship between resistivity and resistance of a cylindrical conductor of length l and area of cross-section A. Hence derive the SI unit of resistivity. (b) Why are alloys used in electrical heating devices? 3
SECTION D
Questions no. 34 to 36 are Long Answer Type questions.
34. (a) (i) Draw two isomeric structures of Butene (C 4 H 8 ).
(ii) Name the following compounds :
(I) H l
(iii) Write the chemical equations for the following reactions. Mention one essential condition each for these reactions to take place. (I) Ethanol undergoes complete oxidation (II) Propene undergoes hydrogenation (III) Ethanoic acid reacts with ethanol 5 OR (b) (i) A carbon compound X is a good solvent. On reaction with sodium, X forms two products Y and Z. Z is used to convert vegetable oil into vegetable ghee. Identify and name X, Y and Z. Also write the equation of reaction of X with sodium to justify your answer.