Question Paper Instructions

• The question paper contains a total of 39 questions
• All questions are compulsory
• The question paper is divided into five sections: A, B, C, D, and E
• 15 minutes is allotted to reading the question paper, during which no answers can be written

Section A (Questions 1-20)

• Multiple choice questions
• Each question carries 1 mark

Section B (Questions 21-26)

• Very short answer type questions
• Each question carries 2 marks
• Answers should be in the range of 30 to 50 words

Section C (Questions 27-33)

• Short answer type questions
• Each question carries 3 marks
• Answers should be in the range of 50 to 80 words

Section D (Questions 34-36)

• Long answer type questions
• Each question carries 5 marks
• Answers should be in the range of 80 to 120 words

Section E (Questions 37-39)

• Source-based/case-based units of assessment
• Each unit carries 4 marks with sub-parts

General Instructions Regarding Choices

• There is no overall choice
• Internal choice may be provided within some sections
• Only one alternative should be attempted in questions with internal choices

Balanced Chemical Equation for Zinc and Sodium Hydroxide Reaction

• The balanced chemical equation for the reaction when 2 mL of sodium hydroxide solution is added to granulated zinc and warmed is:
• 2NaOH + Zn → Na2ZnO2 + H2

Decomposition Reaction with Light

• The decomposition reaction in which the source of energy for decomposition is light is:
• 2AgBr → 2Ag + Br2

Metal and Non-Metal in Liquid State at Room Temperature

• The metal and non-metal that exist in liquid state at room temperature respectively are:
• Mercury and Bromine

Correct Statements About Carbon Compounds

• The correct statements about carbon compounds are:
• (ii) are bad conductors of electricity
• (iv) have weak forces of attraction between their molecules

Compound with Maximum Water of Crystallization

• The compound with the maximum number of water of crystallization in its crystalline form in one molecule is:
• FeSO4

Nature of Oxides of Aluminum and Zinc

• The oxides of aluminum and zinc are amphoteric

Redox Reaction Explanation

• The reaction MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 is a redox reaction because MnO2 is reduced and HCl is oxidized

Correct Statements About Sex Determination

• The correct statements about sex determination are:
• (ii) The sex of a child is determined by what it inherits from the father.
• (iv) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote.

True Statements About Chromosomes

• The true statements about chromosomes include:
• (i) carry hereditary information from parents to the next generation.
• (ii) are thread like structures located inside the nucleus of an animal cell.
• (iv) are involved in the process of cell division.

Site of Electrical to Chemical Signal Conversion in a Nerve Cell

• In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as Axon

Stomata Closure

• Correct reasons for stomata closing:
• it does not need carbon dioxide for photosynthesis.
• water flows out of the guard cells.

Object Placement for Same Size Image

• To get an image of the same size as the object on a screen using a convex lens, the object should be placed At twice the focal length of the lens.

Part of the Human Eye forming image on light-sensitive screen

• The lens system of the human eye forms an image on a light sensitive screen, which is named Retina

Pattern of Magnetic Field inside a Current carrying Solenoid

• The pattern of the magnetic field produced inside a current carrying solenoid is a series of parallel lines

Food Chain with Missing Second Trophic Level

• Grass, Goat, Lion does not have a second trophic level because the primary consumes is what is missing.

Multiple Fission in Asexual Reproduction

• Plasmodium carries out asexual reproduction by multiple fission

Assertion and Reason: Zinc and Nitric Acid

• Assertion (A): Hydrogen gas is not evolved when zinc reacts with nitric acid.
• Reason (R): Nitric acid oxidizes the hydrogen gas produced to water and itself gets reduced.

Assertion and Reason: Harmful Chemicals in Food Chain

• Assertion (A): Accumulation of harmful chemicals is maximum in the organisms at the highest trophic level of a food chain.
• Reason (R): Harmful chemicals are sprayed on the crops to protect them from diseases and pests.

Assertion and Reason: Aquatic Organisms Breathing Rate

• Assertion (A): The rate of breathing in aquatic organisms is much faster than in terrestrial organisms.
• Reason (R): The amount of oxygen dissolved in water is very high as compared to the amount of oxygen in air.

Assertion and Reason: Rainbow

• Assertion (A): The rainbow is a natural spectrum of sunlight in the sky.
• Reason (R): Rainbow is formed in the sky when the sun is overhead and water droplets are also present in air.