Everyday Science MCQs

1. What is the chemical formula of water?

A) H2O
B) CO2
C) O2
D) NaCl

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2. What is the hardest natural substance on Earth?

A) Gold
B) Iron
C) Diamond
D) Silver

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3. What is the nearest planet to the Sun?

A) Venus
B) Earth
C) Mercury
D) Mars

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4. What gas do plants take in during photosynthesis?

A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen

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5. What is the most abundant gas in Earth’s atmosphere?

A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen

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6. What planet is known as the “Red Planet”?

A) Venus
B) Earth
C) Mars
D) Jupiter

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7. What is the boiling point of water in Celsius?

A) 50°C
B) 100°C
C) 150°C
D) 200°C

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8. What is the chemical symbol for gold?

A) Au
B) Ag
C) Fe
D) Pb

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9. Who is known as the father of modern physics?

A) Isaac Newton
B) Albert Einstein
C) Galileo Galilei
D) Nikola Tesla

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10. What is the main component of the Sun?

A) Helium
B) Nitrogen
C) Oxygen
D) Hydrogen

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11. What is the process by which plants make their food?

A) Photosynthesis
B) Respiration
C) Evaporation
D) Condensation

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12. Which planet has the most moons?

A) Jupiter
B) Saturn
C) Mars
D) Venus

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13. What is the closest star to Earth?

A) Sirius
B) Alpha Centauri
C) Sun
D) Proxima Centauri

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14. What part of the cell contains genetic information?

A) Mitochondria
B) Ribosome
C) Nucleus
D) Cytoplasm

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15. Which planet is known for its rings?

A) Jupiter
B) Uranus
C) Saturn
D) Neptune

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16. What type of energy is produced by moving water?

A) Solar energy
B) Nuclear energy
C) Hydroelectric energy
D) Geothermal energy

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17. What is the SI unit of force?

A) Joule
B) Newton
C) Watt
D) Pascal

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18. What is the pH value of pure water?

A) 5
B) 7
C) 9
D) 11

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19. Which organ in the human body is responsible for pumping blood?

A) Lungs
B) Brain
C) Heart
D) Liver

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20. What is the powerhouse of the cell?

A) Nucleus
B) Chloroplast
C) Ribosome
D) Mitochondria

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21. What metal is liquid at room temperature?

A) Mercury
B) Iron
C) Aluminum
D) Copper

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22. Which gas is commonly known as laughing gas?

A) Oxygen
B) Carbon dioxide
C) Nitrous oxide
D) Helium

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23. What is the chemical formula for table salt?

A) HCl
B) NaCl
C) KCl
D) CaCl

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24. What is the largest internal organ in the human body?

A) Heart
B) Liver
C) Kidney
D) Stomach

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25. What type of rock is formed from lava?

A) Sedimentary
B) Metamorphic
C) Igneous
D) Granite

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26. What is the primary function of red blood cells?

A) To fight infections
B) To carry oxygen
C) To remove waste
D) To digest food

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27. What is the largest bone in the human body?

A) Femur
B) Tibia
C) Humerus
D) Radius

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28. What is the freezing point of water in Celsius?

A) 0°C
B) 32°C
C) -32°C
D) 100°C

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29. Which vitamin is produced when the skin is exposed to sunlight?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D

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30. What is the speed of light in a vacuum?

A) 300,000 km/s
B) 150,000 km/s
C) 100,000 km/s
D) 500,000 km/s

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31. What is the main function of the ozone layer?

A) To provide oxygen
B) To protect against UV radiation
C) To trap heat
D) To reflect sunlight

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32. Which element is essential for the production of hemoglobin in the blood?

A) Calcium
B) Iron
C) Sodium
D) Potassium

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33. What is the basic unit of life?

A) Atom
B) Molecule
C) Cell
D) Organism

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34. What is the function of white blood cells?

A) Carry oxygen
B) Produce energy
C) Fight infection
D) Digest food

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35. What is the most common element in the universe?

A) Helium
B) Carbon
C) Hydrogen
D) Oxygen

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36. What is the process of water vapor turning into liquid called?

A) Evaporation
B) Condensation
C) Precipitation
D) Sublimation

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37. What planet is known as the “Evening Star”?

A) Mars
B) Venus
C) Jupiter
D) Saturn

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38. Which is the smallest particle of an element that retains the properties of the element?

A) Molecule
B) Atom
C) Electron
D) Proton

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39. What is the term for a species that no longer exists?

A) Endangered
B) Extinct
C) Vulnerable
D) Threatened

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40. Which of the following is a renewable energy source?

A) Coal
B) Oil
C) Solar power
D) Natural gas

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41. What is the unit of electrical resistance?

A) Ampere
B) Volt
C) Ohm
D) Joule

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42. What part of the brain controls balance and coordination?

A) Cerebrum
B) Cerebellum
C) Medulla
D) Hypothalamus

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43. What is the atomic number of carbon?

A) 6
B) 12
C) 8
D) 14

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44. Which gas is used by plants during photosynthesis?

A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen

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45. What is the chemical symbol for sodium?

A) S
B) Na
C) So
D) Sd

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46. What type of cells are responsible for transmitting signals in the nervous system?

A) Epithelial cells
B) Muscle cells
C) Neurons
D) Blood cells

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47. What is the largest planet in our solar system?

A) Earth
B) Mars
C) Jupiter
D) Saturn

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48. What is the primary function of the skeletal system?

A) Protection and support
B) Energy production
C) Circulation
D) Digestion

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49. Which process converts a liquid into a gas?

A) Condensation
B) Evaporation
C) Freezing
D) Melting

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50. What is the primary source of energy for the Earth?

A) Moon
B) Sun
C) Wind
D) Water

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51. Which organ is responsible for detoxifying chemicals in the body?

A) Heart
B) Kidneys
C) Liver
D) Lungs

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52. What is the main pigment found in chloroplasts?

A) Carotene
B) Chlorophyll
C) Xanthophyll
D) Anthocyanin

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53. What is the term for the amount of matter in an object?

A) Weight
B) Volume
C) Density
D) Mass

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54. Which organ in the body is responsible for producing insulin?

A) Liver
B) Pancreas
C) Heart
D) Kidneys

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55. What is the process by which plants absorb water?

A) Transpiration
B) Osmosis
C) Diffusion
D) Filtration

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56. What type of electromagnetic radiation is visible to the human eye?

A) Infrared
B) Ultraviolet
C) Gamma rays
D) Visible light

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57. What is the function of the digestive system?

A) Circulation of blood
B) Breakdown of food
C) Protection against disease
D) Production of hormones

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58. What is the primary component of the cell membrane?

A) Nucleic acids
B) Proteins
C) Lipids
D) Carbohydrates

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59. Which gas is a byproduct of respiration?

A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Helium

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60. What is the term for a change in an organism’s environment that causes a reaction?

A) Stimulus
B) Response
C) Adaptation
D) Evolution

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61. What is the main function of the respiratory system?

A) Circulation of blood
B) Exchange of gases
C) Digestion of food
D) Protection against pathogens

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62. What is the chemical formula for glucose?

A) C6H12O6
B) C6H6
C) C12H22O11
D) CH4

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63. What type of wave is sound?

A) Longitudinal wave
B) Transverse wave
C) Electromagnetic wave
D) Surface wave

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64. What is the primary function of enzymes in the body?

A) Provide energy
B) Speed up chemical reactions
C) Store genetic information
D) Transport substances

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65. Which planet is known for its Great Red Spot?

A) Earth
B) Saturn
C) Jupiter
D) Neptune

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66. What is the scientific study of heredity?

A) Ecology
B) Genetics
C) Evolution
D) Microbiology

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67. What is the function of the circulatory system?

A) Breakdown of food
B) Protection against disease
C) Transport of nutrients and oxygen
D) Regulation of body temperature

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68. What is the primary function of the integumentary system?

A) Protection of internal organs
B) Regulation of body temperature
C) Production of hormones
D) Absorption of nutrients

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69. What type of bond is formed when electrons are shared between atoms?

A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond

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70. Which nutrient is essential for muscle growth and repair?

A) Carbohydrates
B) Proteins
C) Fats
D) Vitamins

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71. What is the primary function of the skeletal muscles?

A) Protection of organs
B) Movement of the body
C) Production of blood cells
D) Storage of calcium

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72. Which element is crucial for the formation of thyroid hormones

A) Iron
B) Iodine
C) Calcium
D) Zinc

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73. What is the main organ of the excretory system?

A) Heart
B) Lungs
C) Liver
D) Kidneys

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74. What is the primary purpose of the nervous system?

A) To transport nutrients
B) To coordinate body functions
C) To provide energy
D) To produce hormones

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75. What is the most abundant protein in the human body?

A) Actin
B) Collagen
C) Myosin
D) Keratin

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76. What is the primary function of the lymphatic system?

A) Gas exchange
B) Fluid balance and immunity
C) Digestion
D) Hormone production

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77. Which part of the eye is responsible for detecting light?

A) Iris
B) Cornea
C) Retina
D) Lens

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78. What type of reaction occurs when an acid and a base combine?

A) Combustion
B) Neutralization
C) Decomposition
D) Synthesis

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79. What is the unit of frequency?

A) Joule
B) Hertz
C) Pascal
D) Newton

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80. Which organ produces bile?

A) Pancreas
B) Stomach
C) Liver
D) Gallbladder

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81. What is the process of converting glucose into energy called?

A) Photosynthesis
B) Respiration
C) Fermentation
D) Glycolysis

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82. What is the primary component of a virus?

A) Lipids
B) Proteins
C) Nucleic acids
D) Carbohydrates

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83. Which blood type is considered the universal donor?

A) A
B) B
C) AB
D) O

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84. What is the term for the variety of life in a particular ecosystem?

A) Population
B) Community
C) Biodiversity
D) Habitat

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85. Which vitamin is important for vision?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D

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86. What is the primary function of the reproductive system?

A) Production of hormones
B) Production of offspring
C) Digestion of food
D) Regulation of body temperature

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87. What is the process by which water vapor turns into ice called?

A) Melting
B) Freezing
C) Condensation
D) Sublimation

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88. Which substance is used to preserve food?

A) Salt
B) Sugar
C) Vinegar
D) All of the above

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89. What is the chemical formula for ammonia?

A) NH3
B) H2O
C) CH4
D) CO2

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90. What is the main purpose of vaccines?

A) Treat diseases
B) Prevent diseases
C) Cure infections
D) Increase immunity

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91. Which type of radiation has the longest wavelength?

A) Gamma rays
B) X-rays
C) Radio waves
D) Ultraviolet

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92. What is the primary function of the endocrine system?

A) Production of hormones
B) Regulation of blood pressure
C) Digestion of food
D) Circulation of blood

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93. Which process occurs when a liquid turns into a solid?

A) Evaporation
B) Freezing
C) Melting
D) Condensation

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94. What is the chemical symbol for potassium?

A) P
B) K
C) Po
D) Pt

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95. What is the smallest unit of life?

A) Organ
B) Tissue
C) Cell
D) Organism

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96. Which part of the cell is responsible for protein synthesis?

A) Ribosome
B) Nucleus
C) Mitochondria
D) Golgi apparatus

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97. What is the main function of the immune system?

A) Digestion of food
B) Protection against diseases
C) Circulation of blood
D) Regulation of temperature

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98. Which nutrient is important for maintaining healthy bones?

A) Vitamin A
B) Vitamin C
C) Calcium
D) Iron

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99. What is the main function of the stomach?

A) Absorption of nutrients
B) Digestion of food
C) Filtration of blood
D) Regulation of temperature

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100. What is the scientific study of fungi called?

A) Mycology
B) Botany
C) Zoology
D) Ecology

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