These essential MCQ questions are selected from the most important topics in State Public Service Commission (PSC) examinations 2026. Sections include Physics, Chemistry, Biology, Environmental Science and General Science. For truely unlimited daily MCQ practice, visit Vooo AI Education.
🔬 State PSC Science
1Which is the unit of electric current?
Answer: B — Ampere
The ampere (A) is the SI unit of electric current. It measures the rate of flow of electric charge. One ampere equals one coulomb of charge flowing per second.
The ampere (A) is the SI unit of electric current. It measures the rate of flow of electric charge. One ampere equals one coulomb of charge flowing per second.
2DNA stands for:
Answer: B — Deoxyribonucleic Acid
DNA (Deoxyribonucleic Acid) is the hereditary material in humans and almost all other organisms. It carries genetic instructions for growth, development and reproduction.
DNA (Deoxyribonucleic Acid) is the hereditary material in humans and almost all other organisms. It carries genetic instructions for growth, development and reproduction.
3Which gas is released during photosynthesis?
Answer: C — Oxygen
During photosynthesis, plants absorb CO₂ and water and convert them into glucose using sunlight. Oxygen is released as a byproduct through the stomata of leaves.
During photosynthesis, plants absorb CO₂ and water and convert them into glucose using sunlight. Oxygen is released as a byproduct through the stomata of leaves.
4The speed of sound in air is approximately:
Answer: B — 343 m/s
The speed of sound in air at 20°C is approximately 343 metres per second. It varies with temperature, humidity and the medium through which it travels.
The speed of sound in air at 20°C is approximately 343 metres per second. It varies with temperature, humidity and the medium through which it travels.
5Which organ produces insulin in the human body?
Answer: C — Pancreas
Insulin is produced by beta cells in the islets of Langerhans in the pancreas. It regulates blood glucose levels by allowing cells to absorb glucose from the bloodstream.
Insulin is produced by beta cells in the islets of Langerhans in the pancreas. It regulates blood glucose levels by allowing cells to absorb glucose from the bloodstream.
6Ozone layer protects Earth from which radiation?
Answer: C — Ultraviolet rays
The ozone layer in the stratosphere absorbs most of the Sun's harmful ultraviolet (UV) radiation, especially UV-B. Its depletion leads to increased skin cancer and ecological damage.
The ozone layer in the stratosphere absorbs most of the Sun's harmful ultraviolet (UV) radiation, especially UV-B. Its depletion leads to increased skin cancer and ecological damage.
7The chemical formula of water is:
Answer: C — H₂O
Water (H₂O) consists of two hydrogen atoms covalently bonded to one oxygen atom. It is a universal solvent and essential for all known forms of life on Earth.
Water (H₂O) consists of two hydrogen atoms covalently bonded to one oxygen atom. It is a universal solvent and essential for all known forms of life on Earth.
8Newton's first law of motion is also called:
Answer: B — Law of Inertia
Newton's First Law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force. This property is called inertia.
Newton's First Law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force. This property is called inertia.
9Which blood group is universal donor?
Answer: D — O
Blood group O negative (O-) is considered the universal donor for red blood cells because it lacks A, B and Rh antigens. It can be given to patients of any blood group in emergencies.
Blood group O negative (O-) is considered the universal donor for red blood cells because it lacks A, B and Rh antigens. It can be given to patients of any blood group in emergencies.
10Acid rain is caused mainly by which gases?
Answer: B — SO₂ and NO₂
Acid rain is caused primarily by sulphur dioxide (SO₂) and nitrogen oxides (NO₂) released by burning fossil fuels. These react with water vapour to form sulphuric and nitric acids.
Acid rain is caused primarily by sulphur dioxide (SO₂) and nitrogen oxides (NO₂) released by burning fossil fuels. These react with water vapour to form sulphuric and nitric acids.
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