CBSE Class 10 Science Boards 2025 Sample Paper Solved

Section-A 

Question 1 to 16 are multiple choice questions. Only one of the choices is correct. Select and write the correct choice as well as the answer to these questions.

1 Identify ‘p’, ‘q’ and ‘r’ in the following balanced reaction Heat p Pb (NO₃)₂(s) ------> q PbO(s) + r NO2(g) + O₂(g)
A. 2,2,4
B. 2,4,2
C. 2,4,4
D. 4,2,2

Answer : A

2 Match column I with column II and select the correct option using the given codes.
                                  Column I                                              ​​​​​​​Column II
a. A metal that forms amphoteric oxides                                 (i) Ga
b. A metal which melts when kept on our pal                          (ii) Au
c. A metal that reacts with nitric acid                                       (iii) Al
d. A metal which cannot displace hydrogen from a                (iv) Mn
A. a – (ii), b – (i), c – (iii), d – (iv)
B. a – (iii), b – (i), c – (iv), d – (ii)
C. a – (iv), b – (ii), c – (iii), d – (i)
D. a – (iii), b – (ii), c – (i), d – (iv)

Answer : B

3

The solution in the given figure is likely to be
A. HNO₃
B. C₂H₅OH
C. H₂SO₄
D. CO₂ in water
- - - - - - - - - - - - - -
For Visual Impaired Students
Which among the following is considered as the strongest electrolyte?
A. Dilute acid
B. Dilute sugar solution
C. Glucose solution
D. Ethanol in water

Answer : A

Answer : B

4 An aqueous solution ‘A’ turns the phenolphthalein solution pink. On addition of an aqueous solution ‘B’ to ‘A’, the pink colour disappears. Which of the following statement is true for the solutions ‘A’ and ‘B’.
A. A is strongly basic and B is a weak base.
B. A is strongly acidic and B is a weak acid.
C. A has a pH greater than 7 and B has a pH less than 7.
D. A has a pH less than 7 and B has a pH greater than 7.

Answer : C

5 When 50g of lead powder is added to 300 ml of blue copper sulphatesolution, after a few hours, the solution becomes colourless. This is an example of
A. Combination reaction
B. Decomposition reaction
C. Displacement reaction
D. Double displacement reaction

Answer : C

6 The electronic configuration of three elements X, Y and Z are X- 2, 8, 7; Y- 2, 8, 2; and Z - 2, 8
A. Y and Z are metals
B. Y and X are non-metals
C. X is a non -metal and Y is a metal
D. Y is a non-metal and Z is a metal

Answer : C

7 Which of the following is an endothermic reaction?
A. Burning of candle.
B. Cooking of food.
C. Decomposition of Vegetable matter.
D. Reaction of Sodium with air

Answer : B

8 During cellular oxidation of Glucose, ATP is produced along with formation of other products in this reaction. Which of the following events is associated with production of maximum ATP molecules per molecule of Glucose during this process? Synthesis of
A. ethanol in yeast
B. lactic acid in muscle cells
C. carbon dioxide in yeast cells
D. carbon dioxide in human cells

Answer : D

9 During which of the following stages of the circulation of blood in a normal human being, the oxygenated blood is pumped to all parts of the body?
A. contraction of the left atrium
B. contraction of left ventricle
C. relaxation of the right atrium
D. relaxation of the right ventricle

Answer : B

10 Which of the following adaptations in herbivores helps in digestions of cellulose?
A. Longer large intestine
B. Smaller large intestine
C. Smaller small intestine
D. Longer small intestine

Answer : D

11 There was a cerebellar dysfunction in a patient. Which of the following activities will get disturbed in this patient as a result of this?
A. Salivation
B. Hunger control
C. Posture and balance
D. Regulation of blood pressure

Answer : C

12 In snails individuals can begin life as male and depending on environmental conditions they can become female as they grow. This is because
A. male snails have dominant genetic makeup.
B. female snails have dominant genetic makeup.
C. expression of sex chromosomes can change in a snail’s life time.
D. sex is not genetically determined in snails.

Answer : D

13 In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?
A. A ray parallel to the principal axis.
B. A ray passing through the centre of curvature and incident obliquely.
C. A ray passing through the principal focus and incident obliquely.
D. A ray incident obliquely to the principal axis, at the pole of the mirror.

Answer : B​​​​​​​