3. : The process by which plants make their food is called?
(A) Photosynthesis
(B) Respiration
(C) Transpiration
(D) Fermentation
Photosynthesis General Knowledge MCQs
4. : The largest planet in our solar system is?
(A) Earth
(B) Mars
(C) Jupiter
(D) Saturn
Planets General Knowledge MCQs
5. : Which gas is essential for breathing?
(A) Nitrogen
(B) Oxygen
(C) Carbon dioxide
(D) Helium
6. : The human body has how many bones?
(A) 206
(B) 306
(C) 106
(D) 156
7. : The longest river in the world is?
(A) Amazon
(B) Nile
(C) Yangtze
(D) Mississippi
8. : The heart of a human is made up of?
(A) Muscle tissue
(B) Bone tissue
(C) Nerve tissue
(D) Cartilage
9. : Which planet is known as the “Red Planet”?
(A) Venus
(B) Mars
(C) Earth
(D) Saturn
10. : The chemical symbol for Gold is?
(A) Au
(B) Ag
(C) Pb
(D) Fe
11. : The human brain weighs approximately?
(A) 1.5 kg
(B) 2.5 kg
(C) 3.5 kg
(D) 4.5 kg
12. : Which vitamin is known as the “Sunshine Vitamin”?
(A) Vitamin A
(B) Vitamin B12
(C) Vitamin C
(D) Vitamin D
13. : The speed of light is approximately?
(A) 3 × 10^8 m/s
(B) 3 × 10^6 m/s
(C) 3 × 10^10 m/s
(D) 3 × 10^12 m/s
14. : What is the powerhouse of the cell?
(A) Nucleus
(B) Mitochondria
(C) Ribosome
(D) Chloroplast
15. : The Earth’s atmosphere is composed mostly of?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Argon
16. : The element that is liquid at room temperature is?
(A) Mercury
(B) Gold
(C) Iron
(D) Carbon
17. : The process of water changing from a liquid to a gas is called?
(A) Freezing
(B) Melting
(C) Evaporation
(D) Condensation
18. : The largest organ in the human body is?
(A) Heart
(B) Liver
(C) Skin
(D) Brain
19. : The first element on the periodic table is?
(A) Hydrogen
(B) Helium
(C) Lithium
(D) Oxygen
20. : Which of the following is the hardest natural substance on Earth?
(A) Gold
(B) Iron
(C) Diamond
(D) Platinum
21. : The smallest bone in the human body is found in the?
(A) Finger
(B) Ear
(C) Toe
(D) Nose
22. : Which of the following is an example of a renewable resource?
(A) Coal
(B) Oil
(C) Solar energy
(D) Natural gas
23. : Which gas is responsible for the greenhouse effect?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Hydrogen
24. : The process by which plants lose water through tiny pores in their leaves is called?
(A) Photosynthesis
(B) Respiration
(C) Transpiration
(D) Evaporation
25. : The unit of electric current is?
(A) Volt
(B) Watt
(C) Ampere
(D) Ohm
26. : Which part of the human body has the highest concentration of oxygen?
(A) Heart
(B) Brain
(C) Blood
(D) Lungs
27. : Which vitamin is essential for blood clotting?
(A) Vitamin A
(B) Vitamin B12
(C) Vitamin C
(D) Vitamin K
28. : The chemical formula for methane is?
(A) CH4
(B) C2H6
(C) C3H8
(D) CO2
29. : Which of the following planets has the most moons?
(A) Earth
(B) Mars
(C) Jupiter
(D) Saturn
30. : The atomic number of carbon is?
(A) 4
(B) 6
(C) 8
(D) 12
31. : The first man to walk on the moon was?
(A) Neil Armstrong
(B) Buzz Aldrin
(C) Yuri Gagarin
(D) John Glenn
32. : The most abundant gas in Earth’s atmosphere is?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Argon
33. : Which organ is responsible for pumping blood in the human body?
(A) Lungs
(B) Stomach
(C) Heart
(D) Kidneys
34. : Which of the following is a non-metal?
(A) Iron
(B) Copper
(C) Oxygen
(D) Silver
35. : The hardest substance found in nature is?
(A) Iron
(B) Quartz
(C) Diamond
(D) Gold
36. : The smallest unit of life is?
(A) Organ
(B) Cell
(C) Tissue
(D) Organism
37. : The famous scientist who developed the theory of relativity is?
(A) Isaac Newton
(B) Albert Einstein
(C) Nikola Tesla
(D) Galileo Galilei
38. : The primary source of energy for the Earth is?
(A) Moon
(B) Sun
(C) Wind
(D) Ocean
39. : The first artificial satellite launched into space was?
(A) Sputnik 1
(B) Apollo 11
(C) Voyager 1
(D) Hubble
40. : The study of fungi is called?
(A) Zoology
(B) Botany
(C) Mycology
(D) Entomology
41. : The unit of frequency is?
(A) Hertz
(B) Watt
(C) Ampere
(D) Newton
42. : Which of the following elements is a noble gas?
(A) Oxygen
(B) Nitrogen
(C) Argon
(D) Hydrogen
43. : The human skeleton is made up of how many bones at birth?
(A) 206
(B) 300
(C) 450
(D) 350
44. : The first woman in space was?
(A) Sally Ride
(B) Valentina Tereshkova
(C) Mae Jemison
(D) Dorothy Vaughan
45. : The largest land animal is?
(A) African Elephant
(B) Giraffe
(C) Hippopotamus
(D) Rhinoceros
46. : The process of converting a liquid to a gas below its boiling point is called?
(A) Evaporation
(B) Condensation
(C) Freezing
(D) Melting
47. : The first synthetic plastic was?
(A) Bakelite
(B) Nylon
(C) PVC
(D) Teflon
48. : The gas responsible for the blue color of the Earth’s sky is?
(A) Calcium
(B) Oxygen
(C) Carbon dioxide
(D) Water vapor
49. : Which of the following is a primary color of light?
(A) Green
(B) Red
(C) Yellow
(D) Orange
50. : The chemical symbol for Sodium is?
(A) Na
(B) So
(C) Sn
(D) S
51. : The largest ocean on Earth is?
(A) Atlantic Ocean
(B) Indian Ocean
(C) Southern Ocean
(D) Pacific Ocean
52. : The process by which green plants make their food is called?
(A) Respiration
(B) Transpiration
(C) Photosynthesis
(D) Evaporation
53. : The instrument used to measure atmospheric pressure is called?
(A) Thermometer
(B) Barometer
(C) Hygrometer
(D) Anemometer
54. : Which vitamin helps in the absorption of calcium?
(A) Vitamin A
(B) Vitamin B12
(C) Vitamin C
(D) Vitamin D
55. : The chemical formula of ammonia is?
(A) NH3
(B) H2O
(C) CH4
(D) CO2
56. : Which of the following is a non-renewable resource?
(A) Solar energy
(B) Wind energy
(C) Natural gas
(D) Biomass
57. : The unit of force is?
(A) Joule
(B) Newton
(C) Watt
(D) Ampere
58. : The study of insects is called?
(A) Entomology
(B) Ornithology
(C) Ichthyology
(D) Mammalogy
59. : The coldest place on Earth is?
(A) Antarctica
(B) Siberia
(C) Greenland
(D) Canada
60. : The first law of motion was proposed by?
(A) Albert Einstein
(B) Isaac Newton
(C) Galileo Galilei
(D) Nikola Tesla
61. : The primary function of white blood cells is to?
(A) Carry oxygen
(B) Aid in digestion
(C) Fight infection
(D) Carry nutrients
62. : The first human-made object to reach outer space was?
(A) Sputnik 1
(B) Apollo 11
(C) Voyager 1
(D) Hubble Space Telescope
63. : The chemical symbol for the element oxygen is?
(A) O
(B) Ox
(C) Oy
(D) O2
64. : The total number of chromosomes in a human cell is?
(A) 23
(B) 46
(C) 64
(D) 92
65. : Which planet has the most similar atmosphere to Earth’s?
(A) Venus
(B) Mercury
(C) Jupiter
(D) Saturn
66. : The smallest planet in our solar system is?
(A) Mercury
(B) Venus
(C) Mars
(D) Pluto
67. : Which of the following is a noble gas?
(A) Nitrogen
(B) Argon
(C) Oxygen
(D) Hydrogen
68. : The total number of bones in an adult human body is?
(A) 306
(B) 206
(C) 156
(D) 256
69. : The layer of the atmosphere that protects us from harmful ultraviolet radiation is?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Thermosphere
70. : The main source of energy for the Earth is?
(A) Moon
(B) Sun
(C) Wind
(D) Oceans
71. : Which of the following is an example of a mammal?
(A) Lizard
(B) Bat
(C) Shark
(D) Snake
72. : The color of the sky is blue due to the scattering of light by?
(A) Water vapor
(B) Oxygen molecules
(C) Nitrogen molecules
(D) Carbon dioxide
73. : The Earth’s core is primarily composed of?
(A) Water
(B) Oxygen
(C) Iron
(D) Silicon
74. : The largest internal organ in the human body is?
(A) Heart
(B) Liver
(C) Stomach
(D) Lungs
75. : The smallest planet in the solar system is?
(A) Mercury
(B) Venus
(C) Mars
(D) Pluto
76. : Which of the following is a conductor of electricity?
(A) Wood
(B) Rubber
(C) Copper
(D) Plastic
77. : The first law of thermodynamics is also known as the law of?
(A) Conservation of Energy
(B) Conservation of Mass
(C) Entropy
(D) Heat transfer
78. : Which element is the most abundant in the Earth’s crust?
(A) Oxygen
(B) Silicon
(C) Aluminum
(D) Iron
79. : The process by which plants release water vapor is called?
(A) Photosynthesis
(B) Evaporation
(C) Transpiration
(D) Condensation
80. : The human body’s largest artery is?
(A) Aorta
(B) Pulmonary artery
(C) Carotid artery
(D) Femoral artery
81. : The process by which water changes from a liquid to a solid is called?
(A) Freezing
(B) Melting
(C) Condensation
(D) Evaporation
82. : The power of a lens is measured in?
(A) Meter
(B) Diopter
(C) Watt
(D) Newton
83. : The ozone layer is found in which part of the atmosphere?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Thermosphere
84. : Which of the following is NOT a greenhouse gas?
(A) Carbon dioxide
(B) Methane
(C) Oxygen
(D) Nitrous oxide
85. : Which of the following is a common use of radioactive isotopes?
(A) Cooking food
(B) Treating cancer
(C) Generating electricity
(D) Purifying water
86. : The Earth’s magnetic field is generated by?
(A) The Sun
(B) The Moon
(C) The Earth’s core
(D) The atmosphere
87. : The organ responsible for producing insulin is?
(A) Heart
(B) Kidney
(C) Pancreas
(D) Liver
88. : Which gas is used in filling balloons?
(A) Oxygen
(B) Hydrogen
(C) Nitrogen
(D) Helium
89. : What is the chemical symbol for silver?
(A) Si
(B) S
(C) Ag
(D) Au
90. : The distance between the Earth and the Sun is called?
(A) Light year
(B) Astronomical unit
(C) Parsec
(D) Kilometer
91. : The process of nuclear fusion occurs primarily in?
(A) The Earth’s core
(B) The Moon
(C) The Sun
(D) The outer layers of planets
92. : The most abundant element in the universe is?
(A) Oxygen
(B) Hydrogen
(C) Carbon
(D) Nitrogen
93. : Which of the following is a type of electromagnetic wave?
(A) Sound wave
(B) Water wave
(C) Radio wave
(D) Earthquake wave
94. : The pH level of pure water is?
(A) 1
(B) 7
(C) 14
(D) 10
95. : What is the hardest naturally occurring substance on Earth?
(A) Iron
(B) Quartz
(C) Diamond
(D) Gold
96. : The branch of biology that deals with the study of plants is called?
(A) Zoology
(B) Botany
(C) Mycology
(D) Entomology
97. : The process of converting a gas into a liquid is called?
(A) Melting
(B) Freezing
(C) Condensation
(D) Evaporation
98. : The chemical symbol for potassium is?
(A) Pt
(B) Pa
(C) K
(D) P
99. : The unit of electric power is?
(A) Watt
(B) Ampere
(C) Volt
(D) Ohm
100. : The main function of the roots in plants is to?
(A) Absorb water and minerals
(B) Produce food
(C) Support the plant
(D) Store food