📘 CBSE Class 10 – SCIENCE
📄 Previous Year Questions (PYQs)
⏱ Time: 3 Hours | 📝 Maximum Marks: 80
🔷 GENERAL INSTRUCTIONS
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The question paper consists of 5 Sections A, B, C, D and E.
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All questions are compulsory.
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Use of calculators is not permitted.
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Diagrams must be neat and labelled.
🔶 SECTION A – Multiple Choice Questions
(20 × 1 = 20 marks)
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The SI unit of electric current is:
a) Volt
b) Ampere
c) Ohm
d) Watt -
Which mirror is used in headlights of vehicles?
a) Convex mirror
b) Plane mirror
c) Concave mirror
d) Cylindrical mirror -
The pH of a neutral solution is:
a) 0
b) 5
c) 7
d) 14 -
Which gas is released during photosynthesis?
a) Carbon dioxide
b) Nitrogen
c) Oxygen
d) Hydrogen -
The law of inheritance was proposed by:
a) Darwin
b) Mendel
c) Lamarck
d) Watson -
Which metal is the best conductor of electricity?
a) Iron
b) Aluminium
c) Copper
d) Silver -
The unit of electric power is:
a) Joule
b) Watt
c) Volt
d) Ampere -
A solution that turns blue litmus red is:
a) Base
b) Salt
c) Acid
d) Neutral -
The green pigment in plants is called:
a) Chlorophyll
b) Carotene
c) Xanthophyll
d) Haemoglobin -
Which part of the brain controls balance?
a) Cerebrum
b) Medulla
c) Cerebellum
d) Spinal cord
(Remaining MCQs to be practiced similarly up to Q20)
🔶 SECTION B – Very Short Answer Questions
(5 × 2 = 10 marks)
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Define focal length of a spherical mirror.
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Write the formula for electric power.
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What is oxidation?
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Name the hormone responsible for growth in plants.
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What is a biodegradable substance?
🔶 SECTION C – Short Answer Questions
(6 × 3 = 18 marks)
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Draw a ray diagram to show image formation by a concave mirror when the object is placed between F and C.
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State Ohm’s Law. Represent it graphically.
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Explain the process of rusting of iron.
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What is pollination? Differentiate between self-pollination and cross-pollination.
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Write any three advantages of using renewable sources of energy.
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What is food chain? Explain with an example.
🔶 SECTION D – Long Answer Questions
(5 × 5 = 25 marks)
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(a) Define refractive index.
(b) Derive the relation between focal length and radius of curvature of a spherical mirror. -
(a) Explain the process of digestion in humans.
(b) Name the enzymes involved at different stages. -
(a) What are acids, bases and salts?
(b) Write properties of acids and bases. -
(a) State Mendel’s law of segregation.
(b) Explain it with a suitable cross. -
Explain the structure and working of an electric motor with a labelled diagram.
🔶 SECTION E – Case Study Based Questions
(2 × 5 = 10 marks)
37. Electricity in Daily Life
An electric heater is rated at 1000 W and works on 220 V supply.
a) What is the current drawn by the heater?
b) What is electric power?
c) Write the formula of electric power.
d) Why are heating appliances connected in parallel?
e) Name one safety device used in electric circuits.
38. Ecosystem and Environment
A stable ecosystem consists of producers, consumers and decomposers.
a) Who are producers?
b) Name primary consumers.
c) What is the role of decomposers?
d) What is biological magnification?
e) Why is balance in ecosystem necessary?
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