These essential MCQ questions are selected from the most important topics in KVS (Kendriya Vidyalaya Sangathan) PGT, TGT and PRT recruitment examinations 2026. Sections include Physics, Chemistry, Biology, Environmental Science and General Science as per the KVS 2026 syllabus for teacher recruitment. For truely unlimited daily MCQ practice, visit Vooo AI Education.
🔬 KVS Science
1Which gas is responsible for the greenhouse effect?
Answer: C — Carbon Dioxide
Carbon dioxide (CO₂) is the primary greenhouse gas responsible for climate change. It traps outgoing infrared radiation from the Earth's surface, causing the greenhouse effect. Other greenhouse gases include methane (CH₄), nitrous oxide (N₂O) and water vapour. CO₂ levels have risen from 280 ppm pre-industrial to over 420 ppm today.
Carbon dioxide (CO₂) is the primary greenhouse gas responsible for climate change. It traps outgoing infrared radiation from the Earth's surface, causing the greenhouse effect. Other greenhouse gases include methane (CH₄), nitrous oxide (N₂O) and water vapour. CO₂ levels have risen from 280 ppm pre-industrial to over 420 ppm today.
2The SI unit of electric current is:
Answer: C — Ampere
The Ampere (A) is the SI base unit of electric current, defined as the flow of one coulomb of charge per second. Named after French physicist André-Marie Ampère. Related units: Volt (V) = unit of potential difference, Ohm (Ω) = unit of resistance, Watt (W) = unit of power. Ohm's Law: V = IR.
The Ampere (A) is the SI base unit of electric current, defined as the flow of one coulomb of charge per second. Named after French physicist André-Marie Ampère. Related units: Volt (V) = unit of potential difference, Ohm (Ω) = unit of resistance, Watt (W) = unit of power. Ohm's Law: V = IR.
3Photosynthesis produces which gas?
Answer: C — Oxygen
Photosynthesis: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Plants absorb CO₂ and water, use sunlight to make glucose, and release oxygen as a by-product. This occurs in the chloroplasts using chlorophyll. The oxygen released comes from the splitting of water molecules (photolysis of water).
Photosynthesis: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Plants absorb CO₂ and water, use sunlight to make glucose, and release oxygen as a by-product. This occurs in the chloroplasts using chlorophyll. The oxygen released comes from the splitting of water molecules (photolysis of water).
4Newton's First Law is also called the law of:
Answer: C — Inertia
Newton's First Law (Law of Inertia) states that an object remains at rest or in uniform motion unless acted upon by an external force. Inertia is the tendency of a body to resist change in its state of motion. Heavier objects have more inertia. A passenger lurches forward when a bus brakes — a classic example of inertia.
Newton's First Law (Law of Inertia) states that an object remains at rest or in uniform motion unless acted upon by an external force. Inertia is the tendency of a body to resist change in its state of motion. Heavier objects have more inertia. A passenger lurches forward when a bus brakes — a classic example of inertia.
5The atomic number of an element is equal to:
Answer: B — Number of protons
The atomic number (Z) of an element equals the number of protons in its nucleus. It uniquely identifies an element. In a neutral atom, atomic number also equals the number of electrons. Mass number (A) = protons + neutrons. Isotopes have the same atomic number but different mass numbers (different neutron counts).
The atomic number (Z) of an element equals the number of protons in its nucleus. It uniquely identifies an element. In a neutral atom, atomic number also equals the number of electrons. Mass number (A) = protons + neutrons. Isotopes have the same atomic number but different mass numbers (different neutron counts).
6Which organ in the human body produces insulin?
Answer: C — Pancreas
Insulin is produced by the beta cells of the Islets of Langerhans in the pancreas. Insulin regulates blood glucose by enabling cells to absorb glucose. Deficiency or ineffective use of insulin causes diabetes mellitus. Glucagon (produced by alpha cells of the pancreas) has the opposite effect — it raises blood glucose levels.
Insulin is produced by the beta cells of the Islets of Langerhans in the pancreas. Insulin regulates blood glucose by enabling cells to absorb glucose. Deficiency or ineffective use of insulin causes diabetes mellitus. Glucagon (produced by alpha cells of the pancreas) has the opposite effect — it raises blood glucose levels.
7Sound cannot travel through:
Answer: D — Vacuum
Sound is a mechanical (longitudinal) wave that requires a medium (solid, liquid or gas) to travel. It cannot travel through a vacuum because there are no particles to vibrate and transmit the wave. This is demonstrated by placing a ringing bell in a vacuum jar — as air is pumped out, the sound fades. Light, being an electromagnetic wave, can travel through vacuum.
Sound is a mechanical (longitudinal) wave that requires a medium (solid, liquid or gas) to travel. It cannot travel through a vacuum because there are no particles to vibrate and transmit the wave. This is demonstrated by placing a ringing bell in a vacuum jar — as air is pumped out, the sound fades. Light, being an electromagnetic wave, can travel through vacuum.
8The chemical formula of common salt is:
Answer: B — NaCl
Common salt (table salt) is sodium chloride — NaCl. It is formed by the reaction of sodium (Na) and chlorine (Cl). NaOH = sodium hydroxide (caustic soda), Na₂CO₃ = washing soda (sodium carbonate), NaHCO₃ = baking soda (sodium bicarbonate). Salt is essential for the human body and is used in food preservation.
Common salt (table salt) is sodium chloride — NaCl. It is formed by the reaction of sodium (Na) and chlorine (Cl). NaOH = sodium hydroxide (caustic soda), Na₂CO₃ = washing soda (sodium carbonate), NaHCO₃ = baking soda (sodium bicarbonate). Salt is essential for the human body and is used in food preservation.
9The process of water changing from liquid to gas is called:
Answer: C — Evaporation
Evaporation is the process of liquid water converting to water vapour (gas) at temperatures below boiling point, from the surface of a liquid. Condensation is the reverse (gas to liquid). Sublimation is solid to gas directly (e.g., dry ice, naphthalene). Boiling is rapid evaporation throughout the liquid at boiling point.
Evaporation is the process of liquid water converting to water vapour (gas) at temperatures below boiling point, from the surface of a liquid. Condensation is the reverse (gas to liquid). Sublimation is solid to gas directly (e.g., dry ice, naphthalene). Boiling is rapid evaporation throughout the liquid at boiling point.
10The food chain always begins with:
Answer: D — Producers (green plants)
A food chain always starts with producers — autotrophs like green plants that make their own food through photosynthesis. Then come primary consumers (herbivores), secondary consumers (carnivores eating herbivores) and tertiary consumers. Decomposers (bacteria, fungi) break down dead matter. Energy flows from sun → producers → consumers.
A food chain always starts with producers — autotrophs like green plants that make their own food through photosynthesis. Then come primary consumers (herbivores), secondary consumers (carnivores eating herbivores) and tertiary consumers. Decomposers (bacteria, fungi) break down dead matter. Energy flows from sun → producers → consumers.
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