Q1. Which law explains why rockets work in space?
a) Newton's First Law
b) Newton's Second Law
c) Newton's Third Law
d) Law of Gravitation
Answer: c) Newton's Third Law (Action-reaction principle propels rockets forward)
Q2. Unit of electric potential difference is:
a) Ampere
b) Ohm
c) Volt
d) Watt
Answer: c) Volt (1 Volt = 1 Joule/Coulomb)
Q3. Which mirror is used in vehicle side-view mirrors?
a) Plane mirror
b) Concave mirror
c) Convex mirror
d) Spherical mirror
Answer: c) Convex mirror (Provides wider field of view)
Q4. Chemical name of baking soda is:
a) Sodium carbonate
b) Sodium bicarbonate
c) Sodium hydroxide
d) Sodium chloride
Answer: b) Sodium bicarbonate (NaHCO₃) (Used in fire extinguishers too)
Q5. Which metal is liquid at room temperature?
a) Iron
b) Mercury
c) Aluminum
d) Copper
Answer: b) Mercury (Only metal that's liquid at 25°C)
Q6. pH of pure water is:
a) 5
b) 7
c) 9
d) 14
Answer: b) 7 (Neutral on pH scale)
Q7. The largest organ in human body is:
a) Liver
b) Skin
c) Brain
d) Heart
Answer: b) Skin (Covers about 2 square meters)
Q8. Which plant hormone promotes fruit ripening?
a) Auxin
b) Gibberellin
c) Ethylene
d) Cytokinin
Answer: c) Ethylene (Natural plant hormone gas)
Q9. The main cause of acid rain is:
a) Carbon dioxide
b) Sulfur dioxide
c) Oxygen
d) Nitrogen
Answer: b) Sulfur dioxide (Forms sulfuric acid in atmosphere)
Q10. The 'Project Tiger' was launched in:
a) 1973
b) 1983
c) 1993
d) 2003
Answer: a) 1973 (To protect Bengal tigers in India)
Q11. A pressure cooker cooks food faster because:
a) It increases boiling point
b) It decreases boiling point
c) It reduces heat loss
d) It increases oxygen supply
Answer: a) It increases boiling point (Higher pressure raises water's boiling temperature)
Q12. The working principle of a refrigerator is based on:
a) Evaporation
b) Condensation
c) Both a and b
d) Radiation
Answer: c) Both a and b (Refrigerant cycle involves both processes)
Q13. Which instrument measures atmospheric pressure?
a) Thermometer
b) Barometer
c) Hygrometer
d) Anemometer
Answer: b) Barometer (Invented by Evangelista Torricelli in 1643)
Q14. The SI unit of force is:
a) Joule
b) Newton
c) Watt
d) Pascal
Answer: b) Newton (1 N = 1 kg·m/s²)
Q15. Which color deviates the most when white light passes through a prism?
a) Red
b) Green
c) Violet
d) Yellow
Answer: c) Violet (Shortest wavelength in visible spectrum)
Q16. Chemical formula of washing soda is:
a) NaHCO₃
b) Na₂CO₃·10H₂O
c) NaOH
d) NaCl
Answer: b) Na₂CO₃·10H₂O (Sodium carbonate decahydrate)
Q17. Which gas is used in advertising signs?
a) Oxygen
b) Nitrogen
c) Neon
d) Hydrogen
Answer: c) Neon (Produces bright orange-red glow)
Q18. Process of rusting is an example of:
a) Combustion
b) Oxidation
c) Reduction
d) Sublimation
Answer: b) Oxidation (Iron reacts with oxygen and water)
Q19. Study of fossils is called:
a) Paleontology
b) Archaeology
c) Geology
d) Anthropology
Answer: a) Paleontology (Reveals evolutionary history)
Q20. Which part of the plant conducts photosynthesis?
a) Root
b) Stem
c) Leaf
d) Flower
Answer: c) Leaf (Contains chloroplasts with chlorophyll)
Q21. Montreal Protocol addresses:
a) Climate change
b) Ozone depletion
c) Biodiversity loss
d) Water pollution
Answer: b) Ozone depletion (Phases out ozone-depleting substances)
Q22. Most abundant gas in Earth's atmosphere is:
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
Answer: c) Nitrogen (78% of atmospheric composition)
Q23. A clinical thermometer measures temperature up to:
a) 42°C
b) 100°C
c) 212°C
d) 50°C
Answer: a) 42°C (Covers human body temperature range)
Q24. Principle behind a pressure cooker is:
a) Reduced cooking time
b) Increased boiling point
c) Decreased pressure
d) Enhanced flavor
Answer: b) Increased boiling point (Higher pressure raises boiling temperature)
Q25. Which principle explains why ice floats on water?
a) Pascal's Principle
b) Archimedes' Principle
c) Bernoulli's Principle
d) Newton's Third Law
Answer: b) Archimedes' Principle (Ice is less dense than water due to hydrogen bonding)
Q26. Unit of frequency is:
a) Hertz
b) Decibel
c) Ohm
d) Watt
Answer: a) Hertz (Hz) (1 Hz = 1 cycle per second)
Q27. Which mirror is used in solar cookers?
a) Plane mirror
b) Concave mirror
c) Convex mirror
d) Spherical mirror
Answer: b) Concave mirror (Focuses sunlight to a single point)
Q28. Acid present in vinegar is:
a) Citric acid
b) Acetic acid
c) Lactic acid
d) Formic acid
Answer: b) Acetic acid (CH₃COOH) (4-8% concentration in vinegar)
Q29. Which gas is filled in balloons that rise in air?
a) Oxygen
b) Nitrogen
c) Helium
d) Carbon dioxide
Answer: c) Helium (Lighter than air, non-flammable)
Q30. The chemical symbol for silver is:
a) Si
b) Ag
c) Au
d) S
Answer: b) Ag (From Latin 'Argentum')
Q31. The largest gland in human body is:
a) Pancreas
b) Liver
c) Thyroid
d) Pituitary
Answer: b) Liver (Weighs about 1.5 kg, performs 500+ functions)
Q32. Which vitamin is synthesized by skin in sunlight?
a) Vitamin A
b) Vitamin B12
c) Vitamin C
d) Vitamin D
Answer: d) Vitamin D (Prevents rickets and osteoporosis)
Q33. The Chipko Movement originated in which state?
a) Kerala
b) Uttarakhand
c) Tamil Nadu
d) Karnataka
Answer: b) Uttarakhand (1973 forest conservation movement)
Q34. Main component of biogas is:
a) Methane
b) Ethane
c) Propane
d) Butane
Answer: a) Methane (50-75% of biogas composition)
Q35. A refrigerator works on the principle of:
a) Evaporation
b) Condensation
c) Both a and b
d) Radiation
Answer: c) Both a and b (Refrigerant undergoes phase changes)
Q36. Blue color of sky is due to:
a) Reflection
b) Refraction
c) Scattering
d) Dispersion
Answer: c) Scattering (Rayleigh scattering of shorter wavelengths)
Q37. Which law explains the working principle of rockets?
a) Newton's First Law
b) Newton's Second Law
c) Newton's Third Law
d) Law of Gravitation
Answer: c) Newton's Third Law (Action-reaction forces propel the rocket forward)
Q38. SI unit of electric current is:
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: c) Ampere (Measures flow of electric charge)
Q39. Which phenomenon causes the blue color of the sky?
a) Reflection
b) Refraction
c) Rayleigh Scattering
d) Dispersion
Answer: c) Rayleigh Scattering (Shorter blue wavelengths scatter more)
Q40. The chemical formula of common salt is:
a) NaCl
b) HCl
c) NaOH
d) KCl
Answer: a) NaCl (Sodium chloride, essential for human body)
Q41. Which gas is used in fire extinguishers?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide (Displaces oxygen to smother fires)
Q42. The pH of pure water at 25°C is:
a) 5
b) 7
c) 9
d) 14
Answer: b) 7 (Neutral on the pH scale)
Q43. The powerhouse of the cell is:
a) Nucleus
b) Mitochondria
c) Ribosome
d) Golgi Apparatus
Answer: b) Mitochondria (Produces ATP through cellular respiration)
Q44. Which plant hormone promotes cell division?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Abscisic acid
Answer: c) Cytokinin (Works with auxins in plant growth regulation)
Q45. The main greenhouse gas responsible for global warming is:
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide (Traps heat in the atmosphere)
Q46. Project Tiger was launched in which year?
a) 1973
b) 1983
c) 1993
d) 2003
Answer: a) 1973 (Wildlife conservation initiative in India)
Q47. A pressure cooker cooks food faster because it:
a) Increases boiling point
b) Decreases boiling point
c) Reduces heat loss
d) Increases oxygen supply
Answer: a) Increases boiling point (Higher pressure raises water's boiling temperature)
Q48. Working principle of a washing machine is based on:
a) Centripetal force
b) Centrifugal force
c) Gravitational force
d) Frictional force
Answer: b) Centrifugal force (Spins water outward through holes)
Q49. Which device converts mechanical energy into electrical energy?
a) Motor
b) Generator
c) Transformer
d) Rectifier
Answer: b) Generator (Works on electromagnetic induction principle)
Q50. Color with the longest wavelength in visible light is:
a) Violet
b) Blue
c) Green
d) Red
Answer: d) Red (620-750 nm wavelength range)
Q51. Which mirror always forms a virtual, erect and diminished image?
a) Plane mirror
b) Concave mirror
c) Convex mirror
d) Spherical mirror
Answer: c) Convex mirror (Used in vehicle side-view mirrors)
Q52. The most electronegative element is:
a) Oxygen
b) Fluorine
c) Chlorine
d) Nitrogen
Answer: b) Fluorine (Pauling scale value: 4.0)
Q53. Which gas is known as 'laughing gas'?
a) Oxygen
b) Nitrous oxide
c) Carbon dioxide
d) Hydrogen
Answer: b) Nitrous oxide (N₂O) (Used as anesthetic in dentistry)
Q54. The chemical used in photography is:
a) Silver bromide
b) Sodium chloride
c) Calcium carbonate
d) Potassium nitrate
Answer: a) Silver bromide (Light-sensitive compound in photographic films)
Q55. The largest artery in human body is:
a) Pulmonary artery
b) Aorta
c) Coronary artery
d) Renal artery
Answer: b) Aorta (Carries oxygenated blood from heart to body)
Q56. Which vitamin helps in blood clotting?
a) Vitamin A
b) Vitamin B12
c) Vitamin C
d) Vitamin K
Answer: d) Vitamin K (Essential for prothrombin synthesis)
The Montreal Protocol addresses:
a) Climate change
b) Ozone depletion
c) Biodiversity loss
d) Water pollution
Answer: b) Ozone depletion (Phases out ozone-depleting substances like CFCs)
The most abundant element in Earth's crust is:
a) Silicon
b) Aluminum
c) Oxygen
d) Iron
Answer: c) Oxygen (46.6% by weight, mainly in silicates)
A clinical thermometer measures temperature up to:
a) 42°C
b) 100°C
c) 212°C
d) 50°C
Answer: a) 42°C (Covers human body temperature range)
The principle behind a pressure cooker is:
a) Reduced cooking time
b) Increased boiling point
c) Decreased pressure
d) Enhanced flavor
Answer: b) Increased boiling point (Higher pressure raises water's boiling temperature)
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