KENDRIYA VIDYALAYA SANGATHAN
CHENNAI REGION
FIRST PRE-BOARD EXAMINATION 2024-25
SCIENCE (086)
Max. Marks: 80
Class: X Time Allowed: 3 hours
General Instructions:
1. All questions would be compulsory. However, an internal choice of approximately 33% would be
provided. 50% marks are to be allotted to competency-based questions.
2. Section A would have 16 simple/complex MCQs and 04 Assertion-Reasoning type questions
carrying 1 mark each.
3. Section B would have 6 Short Answer (SA) type questions carrying 02 marks each.
4. Section C would have 7 Short Answer (SA) type questions carrying 03 marks each.
5. Section D would have 3 Long Answer (LA) type questions carrying 05 marks each.
6. Section E would have 3 source based/case based/passage based/integrated units of assessment
(04 marks each) with sub-parts of the values of 1/2/3 marks.
Section- A
Questions 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 Out of the following statements, which is correct for the given chemical reaction? 1
ZnO + CO Zn + CO2
a) ZnO is being oxidized
b) CO is being reduced
c) CO2 is being oxidized
d) ZnO is being reduced
2 Baking powder is a mixture of: 1
a) Sodium carbonate and Acetic acid
b) Sodium carbonate and Tartaric acid
c) Sodium hydrogen carbonate and Tartaric acid
d) Sodium hydrogen carbonate and Acetic acid
3 From the following reactions which one is considered to be endothermic reaction: 1
a) Decomposition of vegetable matter into compost.
b) Decomposition of calcium carbonate to form quick lime and carbon dioxide.
c) Burning of a candle
d) Process of respiration.
4 Identify the following unsaturated hydrocarbons given below? 1
(i) (ii) (iii) (iv)
a) (i) and (ii) b) (i) and (iv) c) (iii) and (iv) d) (ii) and (iii)
, 5 Identify the aim of given experiment? 1
a) To prove that sun light is essential for photosynthesis
b) To prove that carbon dioxide is essential for photosynthesis
c) To prove that water is essential for photosynthesis
d) To prove that chlorophyll is essential for photosynthesis.
6 What are the final products of proteins, carbohydrates and fats respectively in human 1
digestion
a) (i) Amino acids, (ii) glucose and (iii) fatty acids
b) (i) Amino acids, (ii) glucose, (iii) fatty acids and glycerol
c) (i) Glucose, (ii) fatty acids and glycerol, (iii) amino acids
d) (i) Sugar, (ii) amino acids, (iii) fatty acids and glycerol
7 An aqueous solution ‘A’ turns phenolphthalein solution pink. On addition of an aqueous 1
solution ‘B’ to ‘A’, the pink colour disappears. Which of the following statement is true for
solution ‘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 pH greater than 7 and ‘B’ has pH less than 7.
d) ‘A’ has pH less than 7 and ‘B’ has pH greater than 7.
8 Generally, non-metals are not lustrous. Which of the following non-metal is lustrous? 1
a) Sulphur b) Bromine c) Phosphorous d) Iodine
9 An object is positioned 30 cm away from a convex mirror with a focal length of 15 cm. At 1
what distance the image is formed from the pole:
a) +20cm from the pole b) -10cm from the pole
c) +10cm from the pole d) + 60cm from the pole
10 Name the plant hormone that acts as a growth inhibitor and is also responsible for causing leaf 1
wilting.
a) Abscisic acid b) Cytokinin c) Auxin d) Gibberellin
11 Which statement shows interaction of an abiotic component with a biotic component in an 1
ecosystem?
a) A mouse fighting with another mouse for food.
b) An earthworm making a burrow in the soil.
c) A grasshopper feeding on a leaf.
d) Rainwater running down into the lake.
12 Galvanization is a method of protecting Iron from rusting by coating with a thin layer of: 1
a) Gallium b) Aluminium c) Zinc d) Silver
13 What type of energy is transferred from one trophic level to the next in a food chain? 1
a) Heat energy b) Light energy c) Mechanical energy d) Chemical energy
CHENNAI REGION
FIRST PRE-BOARD EXAMINATION 2024-25
SCIENCE (086)
Max. Marks: 80
Class: X Time Allowed: 3 hours
General Instructions:
1. All questions would be compulsory. However, an internal choice of approximately 33% would be
provided. 50% marks are to be allotted to competency-based questions.
2. Section A would have 16 simple/complex MCQs and 04 Assertion-Reasoning type questions
carrying 1 mark each.
3. Section B would have 6 Short Answer (SA) type questions carrying 02 marks each.
4. Section C would have 7 Short Answer (SA) type questions carrying 03 marks each.
5. Section D would have 3 Long Answer (LA) type questions carrying 05 marks each.
6. Section E would have 3 source based/case based/passage based/integrated units of assessment
(04 marks each) with sub-parts of the values of 1/2/3 marks.
Section- A
Questions 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 Out of the following statements, which is correct for the given chemical reaction? 1
ZnO + CO Zn + CO2
a) ZnO is being oxidized
b) CO is being reduced
c) CO2 is being oxidized
d) ZnO is being reduced
2 Baking powder is a mixture of: 1
a) Sodium carbonate and Acetic acid
b) Sodium carbonate and Tartaric acid
c) Sodium hydrogen carbonate and Tartaric acid
d) Sodium hydrogen carbonate and Acetic acid
3 From the following reactions which one is considered to be endothermic reaction: 1
a) Decomposition of vegetable matter into compost.
b) Decomposition of calcium carbonate to form quick lime and carbon dioxide.
c) Burning of a candle
d) Process of respiration.
4 Identify the following unsaturated hydrocarbons given below? 1
(i) (ii) (iii) (iv)
a) (i) and (ii) b) (i) and (iv) c) (iii) and (iv) d) (ii) and (iii)
, 5 Identify the aim of given experiment? 1
a) To prove that sun light is essential for photosynthesis
b) To prove that carbon dioxide is essential for photosynthesis
c) To prove that water is essential for photosynthesis
d) To prove that chlorophyll is essential for photosynthesis.
6 What are the final products of proteins, carbohydrates and fats respectively in human 1
digestion
a) (i) Amino acids, (ii) glucose and (iii) fatty acids
b) (i) Amino acids, (ii) glucose, (iii) fatty acids and glycerol
c) (i) Glucose, (ii) fatty acids and glycerol, (iii) amino acids
d) (i) Sugar, (ii) amino acids, (iii) fatty acids and glycerol
7 An aqueous solution ‘A’ turns phenolphthalein solution pink. On addition of an aqueous 1
solution ‘B’ to ‘A’, the pink colour disappears. Which of the following statement is true for
solution ‘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 pH greater than 7 and ‘B’ has pH less than 7.
d) ‘A’ has pH less than 7 and ‘B’ has pH greater than 7.
8 Generally, non-metals are not lustrous. Which of the following non-metal is lustrous? 1
a) Sulphur b) Bromine c) Phosphorous d) Iodine
9 An object is positioned 30 cm away from a convex mirror with a focal length of 15 cm. At 1
what distance the image is formed from the pole:
a) +20cm from the pole b) -10cm from the pole
c) +10cm from the pole d) + 60cm from the pole
10 Name the plant hormone that acts as a growth inhibitor and is also responsible for causing leaf 1
wilting.
a) Abscisic acid b) Cytokinin c) Auxin d) Gibberellin
11 Which statement shows interaction of an abiotic component with a biotic component in an 1
ecosystem?
a) A mouse fighting with another mouse for food.
b) An earthworm making a burrow in the soil.
c) A grasshopper feeding on a leaf.
d) Rainwater running down into the lake.
12 Galvanization is a method of protecting Iron from rusting by coating with a thin layer of: 1
a) Gallium b) Aluminium c) Zinc d) Silver
13 What type of energy is transferred from one trophic level to the next in a food chain? 1
a) Heat energy b) Light energy c) Mechanical energy d) Chemical energy
