Kendriya Vidyalaya Sangathan, Varanasi Region
Pre-Board-I Examination-2024-25
Class-X Max. Marks-80
Subject-Science (086) Max. Time- 3 Hrs.
General Instructions:
i. This question paper consists of 39 questions in 5 sections.
ii. All questions are compulsory. However, an internal choice is provided in some
questions. A student is expected to attempt only one of these questions.
iii. Section A consists of 20 objective type questions carrying 1 mark each.
iv. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to
these questions should be in the range of 30 to 50 words.
v. Section C consists of 7 Short Answer type questions carrying 03 marks each.
Answers to these questions should be in the range of 50 to 80 words.
vi. Section D consists of 03 Long Answer type questions carrying 05 marks each.
Answer to these questions should be in the range of 80 to 120 words.
vii. Section E consists of 3 source-based/case-based units of assessment of 04 marks each
With sub-parts.
Section-A
Question1to16 are multiple choice questions. Only one of the choice is correct. Select and write
the correct choice as well as the answer to these questions.
Q. Nos. Questions Marks
1 In a redox reaction, oxidation refers to: 1
a) Gain of electrons b) Loss of oxygen c) Loss of electrons d) Addition of
hydrogen
2 Which of the following substances is a base? 1
a) Sodium chloride (NaCl)
b) Potassium hydroxide (KOH)
c) Carbon dioxide (CO₂)
d) Water (H₂O)
3 Which of the following salts does not have water of crystallization? 1
a) Blue vitriol b) Baking soda c) Washing soda d) Gypsum
4 The difference of water molecules is gypsum and Plaster of Paris is 1
a) 5/2 b) 2 c) 1/2 d) 3/2
5 An iron nail was suspended in CuSO4 solution and kept for a while the 1
solution is
a) Remained blue and coating was found on the nail.
b)Turned green and a coating was formed on the nail
c) Remained blue and no coating was formed on the nail
d)Turned green and no coating was formed on the nail
6 The IUPAC name of the compound CH₃-CH₂-OH is 1
a) Methanol b) Ethanol c) Propanol d) Butanol
, 7 How do these fungi obtain nutrition? 1
a) By eating the bread on which it is growing
b) By using nutrients from the bread to prepare their own food
c) By allowing other organisms to grow on the bread and then consuming
them
d) By breaking down the nutrients of bread and then absorbing them
8 The endocrine system communicates through: 1
a) Nerve impulses b) Electrical signals c) Hormones d) Reflex actions
9 What type of reflex action occurs without conscious control? 1
a) Voluntary b) Involuntary c) Conditioned d) Learned
10 Which hormone is secreted by the pancreas to lower blood glucose levels? 1
a) Insulin b) Glucagon c) Adrenaline d) Thyroxine
11 What is the role of the ovary in a flower? 1
a) To produce pollen b) To attract pollinators
c) To protect ovules and develop into fruit d) To support the flower
12 The physical appearance of an organism is referred to as its: 1
a) Phenotype b) Genotype c) Chromosome d) DNA
13 Which of the following describes a concave mirror? 1
a) It converges light rays. b) It diverges light rays
c) It produces real images only. d) It produces virtual images only.
14 Which of the following helps to focus light on the retina? 1
a)Iris b)Pupil c) Ciliary muscles d) Cornea
15 Two resistors of 6 Ω and 3 Ω are connected in parallel. What is the 1
equivalent resistance?
a) 9 Ω b) 4 Ω c) 1.5 Ω d) 2 Ω
Pre-Board-I Examination-2024-25
Class-X Max. Marks-80
Subject-Science (086) Max. Time- 3 Hrs.
General Instructions:
i. This question paper consists of 39 questions in 5 sections.
ii. All questions are compulsory. However, an internal choice is provided in some
questions. A student is expected to attempt only one of these questions.
iii. Section A consists of 20 objective type questions carrying 1 mark each.
iv. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to
these questions should be in the range of 30 to 50 words.
v. Section C consists of 7 Short Answer type questions carrying 03 marks each.
Answers to these questions should be in the range of 50 to 80 words.
vi. Section D consists of 03 Long Answer type questions carrying 05 marks each.
Answer to these questions should be in the range of 80 to 120 words.
vii. Section E consists of 3 source-based/case-based units of assessment of 04 marks each
With sub-parts.
Section-A
Question1to16 are multiple choice questions. Only one of the choice is correct. Select and write
the correct choice as well as the answer to these questions.
Q. Nos. Questions Marks
1 In a redox reaction, oxidation refers to: 1
a) Gain of electrons b) Loss of oxygen c) Loss of electrons d) Addition of
hydrogen
2 Which of the following substances is a base? 1
a) Sodium chloride (NaCl)
b) Potassium hydroxide (KOH)
c) Carbon dioxide (CO₂)
d) Water (H₂O)
3 Which of the following salts does not have water of crystallization? 1
a) Blue vitriol b) Baking soda c) Washing soda d) Gypsum
4 The difference of water molecules is gypsum and Plaster of Paris is 1
a) 5/2 b) 2 c) 1/2 d) 3/2
5 An iron nail was suspended in CuSO4 solution and kept for a while the 1
solution is
a) Remained blue and coating was found on the nail.
b)Turned green and a coating was formed on the nail
c) Remained blue and no coating was formed on the nail
d)Turned green and no coating was formed on the nail
6 The IUPAC name of the compound CH₃-CH₂-OH is 1
a) Methanol b) Ethanol c) Propanol d) Butanol
, 7 How do these fungi obtain nutrition? 1
a) By eating the bread on which it is growing
b) By using nutrients from the bread to prepare their own food
c) By allowing other organisms to grow on the bread and then consuming
them
d) By breaking down the nutrients of bread and then absorbing them
8 The endocrine system communicates through: 1
a) Nerve impulses b) Electrical signals c) Hormones d) Reflex actions
9 What type of reflex action occurs without conscious control? 1
a) Voluntary b) Involuntary c) Conditioned d) Learned
10 Which hormone is secreted by the pancreas to lower blood glucose levels? 1
a) Insulin b) Glucagon c) Adrenaline d) Thyroxine
11 What is the role of the ovary in a flower? 1
a) To produce pollen b) To attract pollinators
c) To protect ovules and develop into fruit d) To support the flower
12 The physical appearance of an organism is referred to as its: 1
a) Phenotype b) Genotype c) Chromosome d) DNA
13 Which of the following describes a concave mirror? 1
a) It converges light rays. b) It diverges light rays
c) It produces real images only. d) It produces virtual images only.
14 Which of the following helps to focus light on the retina? 1
a)Iris b)Pupil c) Ciliary muscles d) Cornea
15 Two resistors of 6 Ω and 3 Ω are connected in parallel. What is the 1
equivalent resistance?
a) 9 Ω b) 4 Ω c) 1.5 Ω d) 2 Ω
