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Science education is crucial in helping students understand the world around them. One effective way to test and reinforce student knowledge is through quizzes. If you are a teacher looking for quiz questions to use in your classroom, we have compiled a list of 100 science quiz questions with answers in PDF format that you can download for free.

Physical Science Questions:

1. What is the chemical symbol for gold?

Answer: Au

2. What is the SI unit of pressure?

Answer: Pascal (Pa)

3. What is the freezing point of water in Fahrenheit?

Answer: 32°F

4. Which gas do plants use in photosynthesis?

Answer: Carbon dioxide (CO2)

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

Answer: 299,792,458 meters per second

Earth Science Questions:

6. What causes tides on Earth?

Answer: The gravitational pull of the moon and the sun

7. What is the Earth’s outermost layer called?

Answer: The crust

8. What is the hottest planet in our solar system?

Answer: Venus

9. What is the largest ocean on Earth?

Answer: The Pacific Ocean

10. What is the name of the supercontinent that existed millions of years ago?

Answer: Pangaea

Biology Questions:

11. What is the powerhouse of the cell?

Answer: The mitochondria

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

Answer: Photosynthesis

13. What is the smallest unit of life?

Answer: The cell

14. What is the largest organ in the human body?

Answer: The skin

15. What is the name of the pigment that gives plants their green color?

Answer: Chlorophyll

Chemistry Questions:

16. What is the atomic number of oxygen?

Answer: 8

17. What is the pH of pure water?

Answer: 7

18. What is the process of turning a gas into a liquid called?

Answer: Condensation

19. What is the chemical formula for table salt?

Answer: NaCl

20. What is the most abundant element in the Earth’s atmosphere?

Answer: Nitrogen

Physics Questions:

21. What is the formula for calculating force?

Answer: Force = mass x acceleration

22. What is the SI unit of energy?

Answer: Joule

23. What is the law of conservation of energy?

Answer: Energy cannot be created or destroyed, only transferred or transformed

24. What is the formula for calculating density?

Answer: Density = mass/volume

25. What is the formula for calculating velocity?

Answer: Velocity = displacement/time

Astronomy Questions:

26. What is the name of the largest moon in our solar system?

Answer: Ganymede

27. What is the smallest planet in our solar system?

Answer: Mercury

28. What is the name of the nearest star to Earth?

Answer: The Sun

29. What is the force that keeps planets in orbit around the Sun?

Answer: Gravity

30. What is the name of the galaxy that contains our solar system?

Answer: The Milky Way

Environmental Science Questions:

31. What is the name of the layer of the atmosphere that protects Earth from harmful UV rays?

Answer: The ozone layer

32. What is the greenhouse effect?

Answer: The trapping of heat in the Earth’s atmosphere by greenhouse gases

33. What is the primary cause of global warming?

Answer: The burning of fossil fuels

34. What is the name of the process by which plants release water vapor into the atmosphere?

Answer: Transpiration

35. What is the main source of energy for most ecosystems on Earth?

Answer: The Sun

Health Science Questions:

36. What is the name of the organ that pumps blood throughout the body?

Answer: The heart

37. What is the function of red blood cells?

Answer: To carry oxygen to the body’s tissues

38. What is the largest organ in the human body?

Answer: The liver

39. What is the name of the system responsible for protecting the body from pathogens?

Answer: The immune system

40. What is the hormone that regulates blood sugar levels?

Answer: Insulin

Geology Questions:

41. What is the process by which rocks are broken down into smaller pieces?

Answer: Weathering

42. What is the name of the process by which rocks are transformed from one type to another?

Answer: Metamorphism

43. What is the name of the type of rock formed from the cooling of magma or lava?

Answer: Igneous rock

44. What is the name of the layer of the Earth that is made of solid, rigid rock?

Answer: The lithosphere

45. What is the name of the process by which sediment is compacted and cemented into rock?

Answer: Lithification

Meteorology Questions:

46. What is the name of the instrument used to measure atmospheric pressure?

Answer: Barometer

47. What is the term for the line where two air masses with different temperatures meet?

Answer: Front

48. What is the process by which water vapor turns into liquid water?

Answer: Condensation

49. What is the name of the large-scale circulation pattern that influences weather?

Answer: The jet stream

50. What is the term for the average weather conditions in a specific area over a long period of time?

Answer: Climate

Botany Questions:

51. What is the process by which plants take in water from their roots?

Answer: Transpiration

52. What is the name of the male reproductive organ in plants?

Answer: The stamen

53. What is the process by which plants produce seeds?

Answer: Pollination

54. What is the name of the green pigment that helps plants absorb sunlight?

Answer: Chlorophyll

55. What is the part of the plant that anchors it in the soil and absorbs nutrients and water?

Answer: The roots

Zoology Questions:

56. What is the largest mammal in the world?

Answer: The blue whale

57. What is the fastest land animal?

Answer: The cheetah

58. What is the slowest animal in the world?

Answer: The sloth

59. What is the largest predator on land?

Answer: The polar bear

60. What is the only mammal capable of flight?

Answer: The bat

Genetics Questions:

61. What is the name of the molecule that carries genetic information in cells?

Answer: DNA

62. What is the process by which genetic information is passed from parent to offspring?

Answer: Heredity

63. What is the study of genes and genetic variation?

Answer: Genetics

64. What is the term for the unique combination of genes that an individual inherits?

Answer: Genotype

65. What is the term for the physical traits that result from an individual’s genetic makeup?

Answer: Phenotype

Ecology Questions:

66. What is the term for all the living organisms in an area and the non-living components of their environment?

Answer: Ecosystem

67. What is the name of the process by which plants convert sunlight into chemical energy?

Answer: Photosynthesis

68. What is the relationship between two organisms where one benefits and the other is harmed?

Answer: Parasitism

69. What is the process by which two different species evolve in response to each other?

Answer: Coevolution

70. What is the term for the full range of environmental conditions that an organism can survive in?

Answer: Niche

Microbiology Questions:

71. What is the process by which bacteria reproduce?

Answer: Binary fission

72. What is the name of the tiny hair-like structures that help bacteria move?

Answer: Flagella

73. What is the name of the structures that bacteria use to exchange genetic material?

Answer: Plasmids

74. What is the term for bacteria that can survive in extreme conditions?

Answer: Extremophiles

75. What is the term for a substance that inhibits the growth of bacteria?

Answer: Antibiotic

Nutrition Questions:

76. What is the name of the process by which the body breaks down food into nutrients?

Answer: Digestion

77. What is the main function of carbohydrates in the body?

Answer: To provide energy

78. What is the main function of proteins in the body?

Answer: To build and repair tissues

79. What is the main function of fats in the body?

Answer: To store energy

80. What is the name of the process by which the body uses nutrients to build and repair tissues?

Answer: Metabolism

Environmental Chemistry Questions:

81. What is the name of the process by which pollutants are removed from the atmosphere?

Answer: Deposition

82. What is the term for the introduction of harmful substances into the environment?

Answer: Pollution

83. What is the name of the process by which pollutants accumulate in the tissues of organisms?

Answer: Biomagnification

84. What is the term for pollutants that can harm living organisms?

Answer: Toxins

85. What is the name of the layer of the Earth’s atmosphere that contains the ozone layer?

Answer: The stratosphere

Inorganic Chemistry Questions:

86. What is the name of the process by which a solid turns into a gas without first becoming a liquid?

Answer: Sublimation

87. What is the name of the bonding between metal atoms in a crystal lattice?

Answer: Metallic bonding

88. What is the name of the process by which a metal is extracted from its ore?

Answer: Smelting

89. What is the term for a substance that cannot be broken down into simpler substances by chemical reactions?

Answer: Element

90. What is the name of the scale used to measure the acidity or basicity of a substance?

Answer: The pH scale

Organic Chemistry Questions:

91. What is the name of the process by which carbon atoms form chains or rings?

Answer: Polymerization

92. What is the name of the simple sugar molecule that is the building block of carbohydrates?

Answer: Glucose

93. What is the name of the process by which plants convert sunlight into chemical energy?

Answer: Photosynthesis

94. What is the name of the process by which the body breaks down food into nutrients?

Answer: Digestion

95. What is the name of the bond in which two atoms share a pair of electrons?

Answer: Covalent bond

Biochemistry Questions:

96. What is the name of the molecule that carries genetic information in cells?

Answer: DNA

97. What is the main function of enzymes in the body?

Answer: To speed up chemical reactions

98. What is the name of the process by which the body uses nutrients to build and repair tissues?

Answer: Metabolism

99. What is the name of the process by which the body breaks down sugar to produce energy?

Answer: Cellular respiration

100. What is the term for the process by which amino acids are linked together to form proteins?

Answer: Protein synthesis

These 100 science quiz questions cover a wide range of topics in the field of science, from physical science to biology, chemistry, physics, astronomy, environmental science, health science, and more. By testing students on these questions, you can help them reinforce their knowledge and understanding of key scientific concepts.

You can download the PDF file of these science quiz questions for free and use them in your classroom to challenge and engage your students in the exciting world of science. Whether you are a teacher looking for quiz questions or a student looking to test your own knowledge, these questions are a great resource for learning and exploration in the field of science.

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