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100 Science MCQ With Answer

Welcome to a fascinating journey through the world of science! In this blog post, we’ll explore 100 Science MCQ that cover a wide range of scientific topics. From the fundamental elements that make up our universe to the intricate processes that shape our planet, these questions will test your knowledge and ignite your curiosity about the wonders of science.

100 Science MCQ With Answer

1. What is the chemical symbol for the element oxygen?
a) O
b) Ox
c) O2
d) Ol
Answer: a) O

2. Which planet is known as the “Red Planet”?
a) Venus
b) Mars
c) Jupiter
d) Saturn
Answer: b) Mars

3. What is the smallest unit of an element that retains its chemical properties?
a) Molecule
b) Atom
c) Proton
d) Neutron
Answer: b) Atom

4. What is the process by which plants make their own food using sunlight?
a) Respiration
b) Photosynthesis
c) Transpiration
d) Fermentation
Answer: b) Photosynthesis

5. Which gas is most abundant in Earth’s atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: b) Nitrogen

6. What is the chemical formula for water?
a) CO2
b) H2O
c) O2
d) N2
Answer: b) H2O

7. What is the primary function of the mitochondria in a cell?
a) Protein synthesis
b) Energy production
c) Storage of genetic material
d) Cell division
Answer: b) Energy production

8. What is the unit of measurement for electrical resistance?
a) Ampere
b) Volt
c) Ohm
d) Watt
Answer: c) Ohm

9. Which of these is NOT a type of simple machine?
a) Lever
b) Pulley
c) Screw
d) Electron
Answer: d) Electron

10. What causes tides on Earth?
a) Gravitational pull of the Moon
b) Earth’s rotation
c) Solar radiation
d) Earth’s magnetic field
Answer: a) Gravitational pull of the Moon

11. What is the smallest bone in the human body?
a) Femur
b) Patella
c) Stapes
d) Tibia
Answer: c) Stapes

12. What is the chemical symbol for the element gold?
a) Ag
b) Au
c) Gd
d) Go
Answer: b) Au

13. What is the layer of the Earth’s atmosphere where weather occurs?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: a) Troposphere

14. What is the process by which water changes from a liquid to a gas at the surface?
a) Condensation
b) Evaporation
c) Sublimation
d) Melting
Answer: b) Evaporation

15. Which scientist is known for the laws of motion and universal gravitation?
a) Albert Einstein
b) Isaac Newton
c) Galileo Galilei
d) Nikola Tesla
Answer: b) Isaac Newton

16. Which gas do plants take in during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: a) Carbon dioxide

17. What is the largest planet in our solar system?
a) Mars
b) Venus
c) Jupiter
d) Saturn
Answer: c) Jupiter

18. Which organelle is responsible for protein synthesis in a cell?
a) Mitochondria
b) Nucleus
c) Golgi apparatus
d) Ribosome
Answer: d) Ribosome

19. What is the main function of white blood cells?
a) Transport oxygen
b) Fight infection
c) Produce energy
d) Digest food
Answer: b) Fight infection

20. What is the process by which an organism passes on its genetic information to offspring?
a) Evolution
b) Natural selection
c) Reproduction
d) Adaptation
Answer: c) Reproduction

21. Which planet is known for its beautiful rings?
a) Jupiter
b) Mars
c) Venus
d) Saturn
Answer: d) Saturn

22. What is the SI unit of energy?
a) Watt
b) Joule
c) Newton
d) Kilogram
Answer: b) Joule

23. What is the process by which a solid changes directly into a gas?
a) Sublimation
b) Melting
c) Evaporation
d) Condensation
Answer: a) Sublimation

24. What is the chemical symbol for the element carbon?
a) Ca
b) Cb
c) Co
d) C
Answer: d) C

25. What is the main component of the Earth’s core?
a) Iron
b) Oxygen
c) Silicon
d) Aluminum
Answer: a) Iron

26. What is the chemical symbol for the element helium?
a) He
b) H
c) Hi
d) Hei
Answer: a) He

27. What is the unit of measurement for frequency?
a) Hertz
b) Ampere
c) Ohm
d) Joule
Answer: a) Hertz

28. Which of these is a primary color of light?
a) Red
b) Yellow
c) Blue
d) Green
Answer: c) Blue

29. What is the process by which a liquid changes into a solid?
a) Sublimation
b) Melting
c) Evaporation
d) Freezing
Answer: d) Freezing

30. What is the chemical symbol for the element sodium?
a) Sa
b) Sd
c) So
d) Na
Answer: d) Na

31. What is the smallest planet in our solar system?
a) Mars
b) Venus
c) Mercury
d) Earth
Answer: c) Mercury

32. Which gas do humans inhale for respiration?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: a) Oxygen

33. What is the process by which a gas changes directly into a solid?
a) Sublimation
b) Melting
c) Evaporation
d) Condensation
Answer: a) Sublimation

34. Which scientist is known for the theory of relativity?
a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Marie Curie
Answer: b) Albert Einstein

35. What is the chemical symbol for the element iron?
a) Ir
b) In
c) Fe
d) Fi
Answer: c) Fe

36. What is the unit of measurement for electric current?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: c) Ampere

**37. Which of these

is NOT a state of matter?**
a) Solid
b) Liquid
c) Gas
d) Energy
Answer: d) Energy

38. What is the process by which an organism changes over time to better survive in its environment?
a) Evolution
b) Natural selection
c) Reproduction
d) Adaptation
Answer: a) Evolution

39. What is the chemical symbol for the element silver?
a) S
b) Si
c) Ag
d) Ar
Answer: c) Ag

40. What is the largest organ in the human body?
a) Brain
b) Liver
c) Heart
d) Skin
Answer: d) Skin

41. What is the unit of measurement for power?
a) Watt
b) Joule
c) Ampere
d) Newton
Answer: a) Watt

42. What is the process by which a liquid changes into a gas at the surface?
a) Condensation
b) Evaporation
c) Sublimation
d) Melting
Answer: b) Evaporation

43. What is the layer of the Earth’s atmosphere above the stratosphere?
a) Troposphere
b) Mesosphere
c) Ionosphere
d) Exosphere
Answer: b) Mesosphere

44. What is the chemical symbol for the element nitrogen?
a) N
b) Ni
c) Ne
d) Na
Answer: a) N

45. Which of these is a renewable source of energy?
a) Coal
b) Natural gas
c) Oil
d) Solar power
Answer: d) Solar power

46. What is the process by which plants release water vapor into the atmosphere?
a) Respiration
b) Photosynthesis
c) Transpiration
d) Fermentation
Answer: c) Transpiration

47. Which gas is essential for respiration and is released as a waste product?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide

48. What is the chemical symbol for the element calcium?
a) Ca
b) C
c) Co
d) Cal
Answer: a) Ca

49. What is the main component of the Earth’s atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: b) Nitrogen

50. What is the process by which an animal changes its physical characteristics to better survive in its environment?
a) Evolution
b) Natural selection
c) Reproduction
d) Adaptation
Answer: d) Adaptation

51. What is the chemical symbol for the element hydrogen?
a) Hy
b) He
c) Hg
d) H
Answer: d) H

52. What is the layer of the Earth’s atmosphere where the ozone layer is located?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: b) Stratosphere

53. Which gas is responsible for the green color in plants?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Chlorophyll
Answer: d) Chlorophyll

54. What is the process by which rocks are broken down into smaller pieces by natural forces?
a) Erosion
b) Weathering
c) Melting
d) Sublimation
Answer: b) Weathering

55. What is the chemical symbol for the element phosphorus?
a) P
b) Ph
c) Po
d) Pt
Answer: a) P

56. What is the layer of the Earth’s atmosphere above the mesosphere?
a) Troposphere
b) Ionosphere
c) Exosphere
d) Stratosphere
Answer: b) Ionosphere

57. What is the process by which energy is transferred from one object to another through direct contact?
a) Convection
b) Conduction
c) Radiation
d) Reflection
Answer: b) Conduction

58. What is the chemical symbol for the element chlorine?
a) Ch
b) Cl
c) C
d) Ci
Answer: b) Cl

59. What is the unit of measurement for force?
a) Watt
b) Joule
c) Ampere
d) Newton
Answer: d) Newton

60. Which of these is NOT a type of rock?
a) Igneous
b) Sedimentary
c) Metamorphic
d) Magnetic
Answer: d) Magnetic

61. What is the process by which a solid changes into a liquid?
a) Sublimation
b) Melting
c) Evaporation
d) Condensation
Answer: b) Melting

62. What is the layer of the Earth’s atmosphere where the ozone layer is located?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: b) Stratosphere

63. Which gas do humans exhale as a waste product of respiration?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide

64. What is the chemical symbol for the element magnesium?
a) Mg
b) Ma
c) Me
d) Mn
Answer: a) Mg

65. What is the layer of the Earth’s atmosphere above the ionosphere?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: d) Exosphere

66. Which of these is a non-metal element?
a) Sodium
b) Calcium
c) Carbon
d) Iron
Answer: c) Carbon

67. What is the process by which a gas changes into a liquid?
a) Sublimation
b) Melting
c) Evaporation
d) Condensation
Answer: d) Condensation

68. What is the chemical symbol for the element potassium?
a) Ka
b) Ko
c) K
d) P
Answer: c) K

69. What is the unit of measurement for electric potential difference?
a) Volt
b) Ohm
c) Ampere
d) Joule
Answer: a) Volt

70. Which of these is NOT a type of electromagnetic radiation?
a) X-rays
b) Microwaves
c) Sound waves
d) Ultraviolet light
Answer: c) Sound waves

71. What is the process by which liquid water changes into water vapor?
a) Condensation
b) Evaporation
c) Sublimation
d) Melting
Answer: b) Evaporation

72. What is the chemical symbol for the element sulfur?
a) Su
b) S
c) So
d) Se
Answer: b) S

73. What is the layer of the Earth’s atmosphere above the troposphere?
a) Stratosphere
b) Mesosphere
c) Ionosphere
d) Exosphere
Answer: a) Stratosphere

74. What is the process by which energy is transferred through electromagnetic waves?
a) Convection
b) Conduction
c) Radiation
d) Reflection
Answer: c) Radiation

75. What is the chemical symbol for the element neon?
a) Ne
b) N
c) No
d) Na
Answer: a) Ne

76. What is the unit of measurement for electric resistance?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: b) Ohm

77. Which of these is a fossil fuel?
a) Wind
b) Solar power
c) Coal
d) Hydroelectric power
Answer: c) Coal

78. What is the process by which plants break down glucose to release energy?
a) Respiration
b) Photosynthesis
c) Transpiration
d) Fermentation
Answer: a) Respiration

79. Which gas is essential for combustion and is released during the process?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Helium
Answer: a) Oxygen

80. What is the chemical symbol for the element copper?
a) Cu
b) Co
c) Ca
d) C
Answer: a) Cu

81. What is the process by which a gas changes into a liquid directly, without becoming a solid first?
a) Sublimation
b) Melting
c) Evaporation
d) Condensation
Answer: d) Condensation

82. What is the unit of measurement for electrical power consumption?
a) Watt
b) Joule
c) Ampere
d) Kilowatt-hour
Answer: d) Kilowatt-hour

83. What is the chemical symbol for the element zinc?
a) Zc
b) Zn
c) Z
d) Zd
Answer: b) Zn

84. What is the layer of the Earth’s atmosphere above the stratosphere and mesosphere?
a) Troposphere
b) Ionosphere
c) Exosphere
d) Thermosphere
Answer: d) Thermosphere

85. Which of these is a metal element?
a) Hydrogen
b) Carbon
c) Oxygen
d) Iron
Answer: d) Iron

86. What is the process by which a liquid changes into a solid at its freezing point?
a) Sublimation
b) Melting
c) Evaporation
d) Freezing
Answer: d) Freezing

87. What is the chemical symbol for the element aluminum?
a) Al
b) Am
c) Ag
d) Au
Answer: a) Al

88. What is the layer of the Earth’s atmosphere above the thermosphere?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: d) Exosphere

89. What is the process by which energy is transferred through the movement of particles in a fluid?
a) Convection
b) Conduction
c) Radiation
d) Reflection
Answer: a) Convection

90. What is the chemical symbol for the element lead?
a) Le
b) L
c) Pd
d) Pb
Answer: d) Pb

91. What is the process by which energy is transferred through waves, like light or radio waves?
a) Convection
b) Conduction
c) Radiation
d) Reflection
Answer: c) Radiation

92. What is the chemical symbol for the element mercury?
a) H
b) He
c) Me
d) Hg
Answer: d) Hg

93. What is the layer of the Earth’s atmosphere above the troposphere and stratosphere?
a) Mesosphere
b) Ionosphere
c) Exosphere
d) Thermosphere
Answer: a) Mesosphere

94. Which of these is a greenhouse gas?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
Answer: c) Carbon dioxide

95. What is the process by which energy is transferred by the movement of particles without direct contact?
a) Convection
b) Conduction
c) Radiation
d) Reflection
Answer: a) Convection

96. What is the chemical symbol for the element uranium?
a) U
b) Ur
c) Un
d) Ul
Answer: a) U

97. What is the layer of the Earth’s atmosphere above the thermosphere?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: d) Exosphere

98. Which of these is a type of electromagnetic radiation with the longest wavelength?
a) X-rays
b) Microwaves
c) Ultraviolet light
d) Visible light
Answer: b) Microwaves

99. What is the process by which a solid changes directly into a gas without becoming a liquid first?
a) Sublimation
b) Melting
c) Evaporation
d) Condensation
Answer: a) Sublimation

100. What is the chemical symbol for the element tin?
a) Ti
b) Tn
c) Te
d) Sn
Answer: d) Sn