How to Use This Practice Set
Work through each set timed — 25 questions in 18 minutes (about 40 seconds per question, reflecting real exam pressure). Check answers after each section. Track weak areas and revisit those topic notes.
Set 1 — Physics (25 Questions)
1. The SI unit of force is:
- a) Joule
- b) Newton ✓
- c) Watt
- d) Pascal
2. Which mirror is used as a rear-view mirror in vehicles?
- a) Plane mirror
- b) Concave mirror
- c) Convex mirror ✓
- d) Parabolic mirror
3. Sound cannot travel through:
- a) Water
- b) Steel
- c) Air
- d) Vacuum ✓
4. The speed of light in vacuum is approximately:
- a) 3 × 10⁶ m/s
- b) 3 × 10⁸ m/s ✓
- c) 3 × 10¹⁰ m/s
- d) 3 × 10⁴ m/s
5. The principle of a washing machine is:
- a) Diffusion
- b) Osmosis
- c) Centrifugation ✓
- d) Filtration
6. Ohm's Law states: V =
- a) I + R
- b) I / R
- c) I × R ✓
- d) R / I
7. Which colour has the longest wavelength in visible light?
- a) Violet
- b) Blue
- c) Green
- d) Red ✓
8. C.V. Raman won Nobel Prize in Physics for:
- a) Discovery of X-rays
- b) Raman Effect ✓
- c) Theory of Relativity
- d) Photoelectric Effect
9. The instrument used to measure atmospheric pressure is:
- a) Thermometer
- b) Hygrometer
- c) Barometer ✓
- d) Anemometer
10. Home electrical appliances are connected in:
- a) Series circuit
- b) Parallel circuit ✓
- c) Both series and parallel
- d) Neither
11. The phenomenon of total internal reflection is used in:
- a) Periscope
- b) Microscope
- c) Optical fibre ✓
- d) Telescope
12. Which law states "every action has an equal and opposite reaction"?
- a) Newton's First Law
- b) Newton's Second Law
- c) Newton's Third Law ✓
- d) Law of Conservation of Mass
13. Ultrasound frequency range is:
- a) Below 20 Hz
- b) 20 Hz to 20,000 Hz
- c) Above 20,000 Hz ✓
- d) Above 1,00,000 Hz
14. Which type of lens is used to correct short-sightedness (myopia)?
- a) Convex lens
- b) Concave lens ✓
- c) Cylindrical lens
- d) Bifocal lens
15. The unit of electrical resistance is:
- a) Ampere
- b) Volt
- c) Watt
- d) Ohm ✓
16. Which effect proves that plants absorb light energy?
- a) Raman Effect
- b) Doppler Effect
- c) Photoelectric Effect ✓ (Einstein's explanation)
- d) Compton Effect
17. The freezing point of water in Kelvin scale is:
- a) 0 K
- b) 100 K
- c) 273 K ✓
- d) 373 K
18. Sonar uses which type of waves?
- a) Radio waves
- b) Microwaves
- c) Infrared waves
- d) Ultrasound waves ✓
19. The principle of a refrigerator involves:
- a) Conduction
- b) Convection
- c) Evaporation of refrigerant ✓
- d) Radiation
20. Which force keeps planets in orbit around the Sun?
- a) Magnetic force
- b) Electrostatic force
- c) Gravitational force ✓
- d) Nuclear force
Set 2 — Chemistry (25 Questions)
21. pH of pure water is:
- a) 0
- b) 3
- c) 7 ✓
- d) 14
22. Which acid is present in vinegar?
- a) Citric acid
- b) Hydrochloric acid
- c) Acetic acid ✓
- d) Formic acid
23. Chemical formula of common salt is:
- a) KCl
- b) CaCl₂
- c) NaCl ✓
- d) MgCl₂
24. Which gas is used in fire extinguishers?
- a) Oxygen
- b) Nitrogen
- c) Carbon dioxide ✓
- d) Hydrogen
25. Baking soda is chemically:
- a) NaOH
- b) Na₂CO₃
- c) NaHCO₃ ✓
- d) Na₂SO₄
26. Which metal is liquid at room temperature?
- a) Lead
- b) Gallium
- c) Mercury ✓
- d) Tin
27. Laughing gas is:
- a) NO
- b) NO₂
- c) N₂O ✓
- d) N₂
28. Rust is chemically:
- a) Iron (II) oxide
- b) Iron (III) oxide
- c) Hydrated Iron (III) oxide (Fe₂O₃·xH₂O) ✓
- d) Iron carbonate
29. Brass is an alloy of:
- a) Copper and Tin
- b) Iron and Carbon
- c) Copper and Zinc ✓
- d) Lead and Tin
30. Father of Modern Chemistry:
- a) John Dalton
- b) Antoine Lavoisier ✓
- c) Dmitri Mendeleev
- d) Robert Boyle
31. Acid rain is caused by:
- a) CO₂ and CO
- b) SO₂ and NOₓ ✓
- c) O₃ and CFCs
- d) CH₄ and N₂O
32. Which gas is the major component of LPG?
- a) Methane
- b) Ethane
- c) Butane and Propane ✓
- d) Acetylene
33. The lightest element in the periodic table is:
- a) Helium
- b) Hydrogen ✓
- c) Lithium
- d) Carbon
34. Stainless steel contains iron and:
- a) Nickel only
- b) Chromium only
- c) Chromium and Nickel ✓
- d) Zinc and Tin
35. Which process is used to purify water at household level?
- a) Distillation only
- b) Filtration only
- c) Filtration + Chlorination / Boiling ✓
- d) Centrifugation
36. Ozone layer is found in:
- a) Troposphere
- b) Stratosphere ✓
- c) Mesosphere
- d) Ionosphere
37. The process by which iron converts to rust is:
- a) Reduction
- b) Oxidation ✓
- c) Decomposition
- d) Displacement
38. pH of human blood is:
- a) 6.5–7.0
- b) 7.35–7.45 ✓
- c) 7.8–8.0
- d) 5.5–6.5
39. Which gas is produced during photosynthesis?
- a) Carbon dioxide
- b) Nitrogen
- c) Oxygen ✓
- d) Hydrogen
40. Chemical formula of water is:
- a) HO
- b) H₂O₂
- c) H₂O ✓
- d) H₃O
Set 3 — Biology (25 Questions)
41. Powerhouse of the cell is:
- a) Nucleus
- b) Ribosome
- c) Mitochondria ✓
- d) Chloroplast
42. Photosynthesis takes place in:
- a) Mitochondria
- b) Ribosome
- c) Chloroplast ✓
- d) Vacuole
43. Number of bones in adult human body:
- a) 212
- b) 200
- c) 206 ✓
- d) 196
44. Functional unit of kidney is:
- a) Neuron
- b) Alveolus
- c) Nephron ✓
- d) Villus
45. Universal blood donor group is:
- a) A positive
- b) AB positive
- c) O negative ✓
- d) B negative
46. Smallest bone in human body:
- a) Fibula
- b) Radius
- c) Patella
- d) Stapes (in ear) ✓
47. Father of Genetics:
- a) Charles Darwin
- b) Gregor Mendel ✓
- c) Watson and Crick
- d) Karl Landsteiner
48. Organelle called "suicide bag":
- a) Ribosome
- b) Mitochondria
- c) Vacuole
- d) Lysosome ✓
49. The number of chromosomes in human cells is:
- a) 23
- b) 46 ✓
- c) 48
- d) 44
50. Which organ produces insulin?
- a) Liver
- b) Kidney
- c) Spleen
- d) Pancreas ✓
51. Largest gland in human body:
- a) Pancreas
- b) Thyroid
- c) Liver ✓
- d) Adrenal
52. Gas exchange in lungs occurs in:
- a) Bronchi
- b) Trachea
- c) Bronchioles
- d) Alveoli ✓
53. Haemoglobin is present in:
- a) White blood cells
- b) Platelets
- c) Red blood cells ✓
- d) Plasma
54. Which vitamin is produced by skin on exposure to sunlight?
- a) Vitamin A
- b) Vitamin C
- c) Vitamin D ✓
- d) Vitamin K
55. Theory of Evolution was proposed by:
- a) Gregor Mendel
- b) Louis Pasteur
- c) Charles Darwin ✓
- d) Robert Koch
56. Deficiency of Vitamin C causes:
- a) Rickets
- b) Beriberi
- c) Pellagra
- d) Scurvy ✓
57. Which blood group is Universal Recipient?
- a) O positive
- b) A positive
- c) AB positive ✓
- d) B positive
58. Which is the largest bone in the human body?
- a) Spine
- b) Humerus
- c) Femur (thigh bone) ✓
- d) Tibia
59. Malaria is caused by:
- a) Bacteria
- b) Virus
- c) Protozoan (Plasmodium) ✓
- d) Fungus
60. Which part of the brain controls balance?
- a) Cerebrum
- b) Medulla Oblongata
- c) Cerebellum ✓
- d) Hypothalamus
Set 4 — Environment, Health, Space and Technology (25 Questions)
61. Ozone layer depletion is caused by:
- a) CO₂
- b) CH₄
- c) CFCs ✓
- d) SO₂
62. 10% Law of energy transfer was given by:
- a) Darwin
- b) Mendel
- c) Lindemann ✓
- d) Odum
63. ISRO headquarters is in:
- a) Chennai
- b) Mumbai
- c) Delhi
- d) Bengaluru ✓
64. India's first lunar mission:
- a) Chandrayaan-2
- b) Chandrayaan-1 ✓
- c) MOM
- d) Aditya-L1
65. National Science Day is celebrated on:
- a) 15 August
- b) 26 January
- c) 28 February ✓
- d) 11 May
66. Chandrayaan-3 landed near:
- a) Lunar equator
- b) Lunar north pole
- c) Lunar south pole ✓
- d) Mare Imbrium
67. Goitre is caused by deficiency of:
- a) Iron
- b) Calcium
- c) Iodine ✓
- d) Fluoride
68. Dengue is transmitted by:
- a) Anopheles mosquito
- b) Aedes mosquito ✓
- c) Culex mosquito
- d) Sandfly
69. Guindy National Park is in:
- a) Coimbatore
- b) Madurai
- c) Chennai ✓
- d) Kanyakumari
70. First Indian to go to space:
- a) APJ Abdul Kalam
- b) Vikram Sarabhai
- c) Rakesh Sharma ✓
- d) Sunita Williams
71. Which vitamin prevents night blindness?
- a) Vitamin B
- b) Vitamin C
- c) Vitamin D
- d) Vitamin A ✓
72. Largest planet in solar system:
- a) Saturn
- b) Uranus
- c) Jupiter ✓
- d) Neptune
73. Eutrophication is associated with:
- a) Air pollution
- b) Water pollution ✓
- c) Soil pollution
- d) Noise pollution
74. Penicillin was discovered by:
- a) Louis Pasteur
- b) Edward Jenner
- c) Alexander Fleming ✓
- d) Robert Koch
75. Kudankulam Nuclear Power Plant is in which Tamil Nadu district?
- a) Kanyakumari
- b) Thoothukkudi
- c) Tirunelveli ✓
- d) Madurai
Score Interpretation
| Score (out of 75) | Performance |
|---|---|
| 60–75 | Excellent — ready for exam |
| 45–59 | Good — revise weak areas |
| 30–44 | Average — revisit all topic notes |
| Below 30 | Needs full revision — start from physics basics |
High-Frequency Topics — Revise These Last
Before your exam, do a final scan of:
1. Vitamin deficiency table — Vitamin A→Nightblindness, B1→Beriberi, C→Scurvy, D→Rickets 2. Common acid formulas — HCl (stomach), H₂SO₄ (battery), CH₃COOH (vinegar) 3. ISRO milestones — Chandrayaan-1 (2008), Mangalyaan (2014), Chandrayaan-3 (2023) 4. Indian scientists — C.V. Raman, Vikram Sarabhai, APJ Kalam, Ramanujan 5. Cell organelles — Mitochondria (powerhouse), Lysosome (suicide bag), Chloroplast (photosynthesis) 6. Newton's Laws — 1st (Inertia), 2nd (F=ma), 3rd (Action-Reaction)