CBSE Class 10 Science 2025 Sample Paper Set 05 Solved

SECTION A

1 Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
(a) (i) only
(b) (ii) only
(c) (iv) only
(d) (ii) and (iv)
Answer: d

2 A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers but almost half of them were short. This suggests that the genetic make -up of the tall parent can be depicted as:
(a) TtWW
(b) TTWW
(c) TTww
(d) TtWw
Answer: a

3 An aqueous solution ‘A’ turns the phenolphthalein solution pink. On addition of an aqueous solution ‘B’ to ‘A’, the pink color disappears. Which of the following statement is true for the solution’s ‘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

4 Identify ‘a’, ‘b’ and ‘c’ in the following balanced reaction:
“a” Pb (NO3)2(s) ---------------Heat---------→“b” PbO(s) +“c” NO2(g) + O2(g)
(a) 2,2,4
(b) 2,4,2
(c) 2,4,4
(d) 4,2,2
Answer: a

5 Which of the following statements is correct regarding the propagation of light of different colors of white light in air?
(a) Red light moves fastest
(b) Blue light moves faster than green light
(c) All the colors of the white light move with the same speed
(d) Yellow light moves with the mean speed as that of the red and the violet light
Answer: c

6 Which of the following is the correct sequence of events of sexual reproduction in a flower?
(а) pollination, fertilization, seedling, embryo
(b) seedling, embryo, fertilization, pollination
(c) pollination, fertilization, embryo, seedling
(d) embryo, seedling, pollination, fertilization
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 Choose the incorrect statement from the following regarding magnetic lines of field
(a) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle point
(b) Magnetic field lines are closed curves
(c) If magnetic field lines are parallel and equidistant, they represent zero field strength
(d) Relative strength of magnetic field is shown by the degree of closeness of the field lines
Answer: c

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