These essential MCQ questions are selected from the most important topics in CBSE Class 10 Science Board Examination 2026. Sections include Physics (Light, Electricity), Chemistry (Chemical Reactions, Acids-Bases) and Biology (Life Processes, Heredity) as per NCERT syllabus. For truely unlimited daily MCQ practice, visit Vooo AI Education.
🔭 CBSE Class 10 Science
1Which mirror is used as a rear-view mirror in vehicles?
Answer: C — Convex mirror
Convex mirrors are used as rear-view mirrors because they always form an erect, virtual and diminished image, providing a wider field of view. Concave mirrors are used as shaving/makeup mirrors and in headlights.
Convex mirrors are used as rear-view mirrors because they always form an erect, virtual and diminished image, providing a wider field of view. Concave mirrors are used as shaving/makeup mirrors and in headlights.
2The process of gaining electrons is called:
Answer: B — Reduction
Reduction is the gain of electrons (or decrease in oxidation number). Oxidation is the loss of electrons. Both occur simultaneously — this is called a Redox reaction. Mnemonic: OIL RIG — Oxidation Is Loss, Reduction Is Gain.
Reduction is the gain of electrons (or decrease in oxidation number). Oxidation is the loss of electrons. Both occur simultaneously — this is called a Redox reaction. Mnemonic: OIL RIG — Oxidation Is Loss, Reduction Is Gain.
3Which part of the plant is responsible for photosynthesis?
Answer: C — Leaf
Leaves are the primary site of photosynthesis. They contain chloroplasts with chlorophyll that absorbs sunlight. The leaf's flat shape and numerous stomata make it ideal for gas exchange and light absorption.
Leaves are the primary site of photosynthesis. They contain chloroplasts with chlorophyll that absorbs sunlight. The leaf's flat shape and numerous stomata make it ideal for gas exchange and light absorption.
4SI unit of electric resistance is:
Answer: D — Ohm
The SI unit of electrical resistance is the Ohm (Ω), named after German physicist Georg Simon Ohm. Ohm's Law states: V = IR, where V is voltage (Volt), I is current (Ampere) and R is resistance (Ohm).
The SI unit of electrical resistance is the Ohm (Ω), named after German physicist Georg Simon Ohm. Ohm's Law states: V = IR, where V is voltage (Volt), I is current (Ampere) and R is resistance (Ohm).
5Which acid is present in vinegar?
Answer: B — Acetic acid
Vinegar contains dilute acetic acid (ethanoic acid, CH₃COOH), typically at 5-8% concentration. Citric acid is in lemons, lactic acid is in curd, and tartaric acid is in tamarind and grapes.
Vinegar contains dilute acetic acid (ethanoic acid, CH₃COOH), typically at 5-8% concentration. Citric acid is in lemons, lactic acid is in curd, and tartaric acid is in tamarind and grapes.
6The trait that does not appear in F1 generation is called:
Answer: B — Recessive
In Mendel's experiments, the trait that disappears in the F1 generation is called recessive. It reappears in F2 generation in 1/4 of the offspring. Dominant traits are expressed when at least one dominant allele is present.
In Mendel's experiments, the trait that disappears in the F1 generation is called recessive. It reappears in F2 generation in 1/4 of the offspring. Dominant traits are expressed when at least one dominant allele is present.
7Magnetic field lines around a bar magnet emerge from:
Answer: C — North pole
Magnetic field lines emerge from the North pole and enter the South pole of a magnet (outside the magnet). Inside the magnet, field lines run from South to North. Field lines never intersect each other.
Magnetic field lines emerge from the North pole and enter the South pole of a magnet (outside the magnet). Inside the magnet, field lines run from South to North. Field lines never intersect each other.
8The pH of a neutral solution is:
Answer: B — 7
A neutral solution has pH = 7. Acidic solutions have pH < 7 and basic (alkaline) solutions have pH > 7. Pure water is neutral with pH 7. The pH scale ranges from 0 (most acidic) to 14 (most basic).
A neutral solution has pH = 7. Acidic solutions have pH < 7 and basic (alkaline) solutions have pH > 7. Pure water is neutral with pH 7. The pH scale ranges from 0 (most acidic) to 14 (most basic).
9Which gas is produced when zinc reacts with dilute H₂SO₄?
Answer: C — Hydrogen
Zn + H₂SO₄ → ZnSO₄ + H₂↑. When zinc (an active metal) reacts with dilute sulphuric acid, zinc sulphate and hydrogen gas are produced. The hydrogen gas can be tested with a burning splint — it burns with a pop sound.
Zn + H₂SO₄ → ZnSO₄ + H₂↑. When zinc (an active metal) reacts with dilute sulphuric acid, zinc sulphate and hydrogen gas are produced. The hydrogen gas can be tested with a burning splint — it burns with a pop sound.
10The number of chromosomes in a human body cell is:
Answer: B — 46
Human body cells (somatic cells) contain 46 chromosomes arranged in 23 pairs. Gametes (sperm and egg) contain 23 chromosomes (haploid). During fertilisation, 23 + 23 = 46 chromosomes are restored in the zygote.
Human body cells (somatic cells) contain 46 chromosomes arranged in 23 pairs. Gametes (sperm and egg) contain 23 chromosomes (haploid). During fertilisation, 23 + 23 = 46 chromosomes are restored in the zygote.
Ready to ace CBSE Class 10 Boards 2026?
Get free daily CBSE Class 10 Science MCQs. Unlimited practice starts from just ₹120/month.
See Plans — Starts at ₹120