Science Quiz Questions with Answers: A science quiz is a simple and effective way to build curiosity, critical thinking, and subject knowledge among students. It helps learners revise important concepts in Physics, Chemistry, Biology, and everyday scientific facts in a fun and interactive manner. Whether used in classrooms, competitions, or self-study, science quiz questions improve memory and understanding of core topics.
This academic resource includes 100 science quiz questions with answers designed for different learning levels. Students can practice using a science quiz with answers to check their progress instantly and identify weak areas. For easy access and offline study, a science quiz pdf format is also useful for schools and coaching institutes.
Covering topics from science quiz general knowledge to syllabus-based learning, this material is specially useful for science quiz CBSE students preparing for exams and olympiads. The updated science quiz 2026 focuses on current concepts, real-life applications, and problem-solving skills.
By using science quiz questions with answers, learners can build strong basics while enjoying the learning process. Though some students may find few questions tricky at first, regular practice slowly makes science more simple and interesting.
100 Science Quiz Questions with Answers
1. Which gas do plants use for photosynthesis?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Ans: C
2. The boiling point of water is:
A) 50°C
B) 100°C
C) 150°C
D) 200°C
Ans: B
3. Which organ pumps blood in our body?
A) Brain
B) Lungs
C) Heart
D) Liver
Ans: C
4. The nearest planet to the Sun is:
A) Earth
B) Venus
C) Mercury
D) Mars
Ans: C
5. Which vitamin do we get from sunlight?
A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
Ans: D
6. Water changes into ice at:
A) 0°C
B) 10°C
C) 50°C
D) 100°C
Ans: A
7. Which part of plant makes food?
A) Root
B) Stem
C) Leaf
D) Flower
Ans: C
8. Human body has how many lungs?
A) One
B) Two
C) Three
D) Four
Ans: B
9. Which gas is needed for burning?
A) Carbon dioxide
B) Oxygen
C) Nitrogen
D) Hydrogen
Ans: B
10. The hardest natural substance is:
A) Gold
B) Iron
C) Diamond
D) Silver
Ans: C
11. Which planet is called the Red Planet?
A) Jupiter
B) Mars
C) Saturn
D) Venus
Ans: B
12. Sound travels fastest in:
A) Air
B) Water
C) Solid
D) Vacuum
Ans: C
13. Which blood group is universal donor?
A) A
B) B
C) AB
D) O
Ans: D
14. The center of atom is called:
A) Electron
B) Proton
C) Neutron
D) Nucleus
Ans: D
15. Which organ helps us to breathe?
A) Heart
B) Brain
C) Lungs
D) Kidney
Ans: C
16. Which metal is liquid at room temperature?
A) Iron
B) Gold
C) Mercury
D) Copper
Ans: C
17. Plants release which gas?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
Ans: A
18. The largest planet is:
A) Earth
B) Mars
C) Jupiter
D) Venus
Ans: C
19. Which organ cleans blood?
A) Heart
B) Kidney
C) Liver
D) Lung
Ans: B
20. The SI unit of force is:
A) Watt
B) Joule
C) Newton
D) Meter
Ans: C
21. Which vitamin helps in blood clotting?
A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin K
Ans: D
22. Which gas is filled in balloons?
A) Oxygen
B) Helium
C) Carbon dioxide
D) Nitrogen
Ans: B
23. The smallest bone in body is in:
A) Hand
B) Ear
C) Leg
D) Nose
Ans: B
24. Which organ controls body activities?
A) Heart
B) Brain
C) Lung
D) Kidney
Ans: B
25. Which planet has rings?
A) Earth
B) Mars
C) Saturn
D) Mercury
Ans: C
26. Which acid is in lemon?
A) Sulfuric acid
B) Citric acid
C) Hydrochloric acid
D) Nitric acid
Ans: B
27. Which energy comes from Sun?
A) Wind
B) Solar
C) Nuclear
D) Electrical
Ans: B
28. The color of chlorophyll is:
A) Red
B) Blue
C) Green
D) Yellow
Ans: C
29. Which planet is known as Earth’s twin?
A) Mars
B) Venus
C) Mercury
D) Saturn
Ans: B
30. Which mineral is needed for bones?
A) Iron
B) Calcium
C) Zinc
D) Iodine
Ans: B
31. Which gas makes soda fizzy?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Ans: C
32. The main source of energy on Earth is:
A) Wind
B) Water
C) Sun
D) Coal
Ans: C
33. Which organ helps digestion?
A) Lung
B) Stomach
C) Heart
D) Brain
Ans: B
34. Which metal conducts electricity best?
A) Iron
B) Copper
C) Gold
D) Silver
Ans: D
35. Which planet is farthest from Sun?
A) Earth
B) Mars
C) Neptune
D) Venus
Ans: C
36. Which sense organ helps us see?
A) Ear
B) Nose
C) Eye
D) Tongue
Ans: C
37. The freezing point of water is:
A) 0°C
B) 50°C
C) 100°C
D) 150°C
Ans: A
38. Which gas do humans breathe in?
A) Carbon dioxide
B) Nitrogen
C) Oxygen
D) Hydrogen
Ans: C
39. Which part of flower makes seeds?
A) Root
B) Stem
C) Ovary
D) Leaf
Ans: C
40. Which planet has most moons?
A) Earth
B) Jupiter
C) Mars
D) Venus
Ans: B
41. Which vitamin improves eyesight?
A) A
B) B
C) C
D) D
Ans: A
42. Which metal rusts easily?
A) Gold
B) Iron
C) Copper
D) Silver
Ans: B
43. Which organ stores urine?
A) Kidney
B) Bladder
C) Lung
D) Liver
Ans: B
44. Which part of plant absorbs water?
A) Leaf
B) Root
C) Stem
D) Flower
Ans: B
45. Which planet is known for strong storms?
A) Venus
B) Earth
C) Jupiter
D) Mercury
Ans: C
46. Which acid is in stomach?
A) Nitric acid
B) Sulfuric acid
C) Hydrochloric acid
D) Citric acid
Ans: C
47. Which energy flows in wires?
A) Solar
B) Electrical
C) Wind
D) Heat
Ans: B
48. Which blood cells fight disease?
A) Red
B) White
C) Platelets
D) Plasma
Ans: B
49. Which gas causes global warming?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium
Ans: C
50. Which planet is blue in color?
A) Mars
B) Neptune
C) Venus
D) Mercury
Ans: B
51. The SI unit of temperature is:
A) Celsius
B) Fahrenheit
C) Kelvin
D) Joule
Ans: C
52. The tallest animal in the world is:
A) Elephant
B) Horse
C) Giraffe
D) Camel
Ans: C
53. The main fuel used in rockets is:
A) Oxygen
B) Petrol
C) Hydrogen
D) Coal
Ans: C
54. The organ used for hearing is:
A) Eye
B) Nose
C) Ear
D) Tongue
Ans: C
55. Vitamin C is found in:
A) Milk
B) Apple
C) Orange
D) Bread
Ans: C
56. The Sun is a:
A) Planet
B) Star
C) Moon
D) Asteroid
Ans: B
57. Ice floats on water because it is:
A) Heavier
B) Hot
C) Less dense
D) Salty
Ans: C
58. The largest organ in the human body is:
A) Heart
B) Brain
C) Skin
D) Liver
Ans: C
59. The gas present most in air is:
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Ans: B
60. Plants breathe through:
A) Roots
B) Leaves
C) Stems
D) Stomata
Ans: D
61. The hardest bone in human body is:
A) Leg bone
B) Skull
C) Jaw bone
D) Arm bone
Ans: C
62. The force that pulls things toward Earth is:
A) Friction
B) Magnetism
C) Gravity
D) Pressure
Ans: C
63. Light travels fastest in:
A) Air
B) Water
C) Glass
D) Vacuum
Ans: D
64. The gas used in fire extinguisher is:
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium
Ans: C
65. The shape of the Earth is:
A) Flat
B) Square
C) Round
D) Triangle
Ans: C
66. The color of human blood is:
A) Blue
B) Green
C) Red
D) Yellow
Ans: C
67. The Moon has:
A) Air and water
B) Only water
C) No air
D) Forests
Ans: C
68. Energy stored in food is:
A) Heat energy
B) Light energy
C) Chemical energy
D) Sound energy
Ans: C
69. The organ that controls thinking is:
A) Heart
B) Brain
C) Kidney
D) Lung
Ans: B
70. A very hot star looks:
A) Red
B) Yellow
C) White
D) Blue
Ans: D
71. Rain comes from:
A) Rivers
B) Seas
C) Clouds
D) Trees
Ans: C
72. Our galaxy is called:
A) Andromeda
B) Milky Way
C) Orion
D) Solar Way
Ans: B
73. The fuel commonly used in cars is:
A) Coal
B) Diesel
C) Wood
D) Kerosene
Ans: B
74. The metal mostly used in electric wires is:
A) Iron
B) Copper
C) Gold
D) Aluminum
Ans: B
75. The number of bones in adult human body is:
A) 150
B) 186
C) 206
D) 250
Ans: C
76. Acid rain is caused by:
A) Sun heat
B) Water pollution
C) Air pollution
D) Soil erosion
Ans: C
77. Normal human heart beats per minute is about:
A) 40
B) 60
C) 72
D) 100
Ans: C
78. The smallest planet in our solar system is:
A) Mars
B) Venus
C) Mercury
D) Earth
Ans: C
79. Normal human body temperature is:
A) 35°C
B) 36°C
C) 37°C
D) 38°C
Ans: C
80. The main fuel of the Sun is:
A) Oxygen
B) Helium
C) Hydrogen
D) Nitrogen
Ans: C
81. The chemical formula of water is:
A) CO₂
B) H₂O
C) O₂
D) H₂
Ans: B
82. Insects breathe through:
A) Lungs
B) Nose
C) Skin
D) Spiracles
Ans: D
83. Glass is mainly made from:
A) Wood
B) Sand
C) Clay
D) Plastic
Ans: B
84. A rainbow has how many colors?
A) Five
B) Six
C) Seven
D) Eight
Ans: C
85. Vitamin that helps bones grow strong is:
A) A
B) B
C) C
D) D
Ans: D
86. The brain is protected by:
A) Skin
B) Rib cage
C) Skull
D) Backbone
Ans: C
87. The total number of teeth in adult humans is:
A) 28
B) 30
C) 32
D) 34
Ans: C
88. Nerves carry:
A) Blood
B) Oxygen
C) Messages
D) Water
Ans: C
89. The Sun gives us:
A) Ice
B) Energy
C) Smoke
D) Rain
Ans: B
90. Plants need which to make food?
A) Water only
B) Sunlight only
C) Air only
D) Sunlight, water and carbon dioxide
Ans: D
91. A magnet attracts:
A) Wood
B) Plastic
C) Iron
D) Glass
Ans: C
92. Milk is rich in:
A) Iron
B) Calcium
C) Iodine
D) Sodium
Ans: B
93. Wind energy comes from:
A) Water movement
B) Air movement
C) Fire heat
D) Earth rotation
Ans: B
94. Moonlight is:
A) Its own light
B) Fire light
C) Sun’s reflected light
D) Star light
Ans: C
95. Earth takes how much time to rotate once?
A) 12 hours
B) 18 hours
C) 24 hours
D) 48 hours
Ans: C
96. Blood carries:
A) Food only
B) Oxygen only
C) Waste only
D) Oxygen and nutrients
Ans: D
97. Skin helps to:
A) Think
B) Breathe
C) Protect body
D) Pump blood
Ans: C
98. Roots help plants to:
A) Make food
B) Breathe
C) Hold soil
D) Fly
Ans: C
99. Leaves are used to:
A) Drink water
B) Make food
C) Store air
D) Grow seeds
Ans: B
100. Bones give the body:
A) Color
B) Shape
C) Heat
D) Water
Ans: B
101. Hot air always moves:
A) Down
B) Sideways
C) Upward
D) Backward
Ans: C
102. Cold air moves:
A) Up
B) Down
C) Round
D) Fast
Ans: B
103. Fish breathe using:
A) Lungs
B) Nose
C) Gills
D) Skin
Ans: C
104. Birds have hollow bones to:
A) Look big
B) Store food
C) Fly easily
D) Drink water
Ans: C
105. The unit of electricity is:
A) Watt
B) Volt
C) Joule
D) Meter
Ans: B
106. The unit of pressure is:
A) Newton
B) Watt
C) Pascal
D) Volt
Ans: C
107. The unit of light is:
A) Ampere
B) Lumen
C) Kelvin
D) Ohm
Ans: B
108. The unit of power is:
A) Joule
B) Volt
C) Watt
D) Pascal
Ans: C
109. The unit of heat energy is:
A) Kelvin
B) Joule
C) Meter
D) Volt
Ans: B
110. The Sun rises in the:
A) North
B) South
C) East
D) West
Ans: C
Science Quiz related FAQs
Q1. What is a science quiz?
A science quiz is a set of questions based on Physics, Chemistry, Biology, and general science. It helps students test their knowledge in a fun and easy way.
Q2. Who can use these science quiz questions?
These science quiz questions are useful for school students, especially for Classes 1 to 10, including CBSE students. Teachers can also use them for class activities.
Q3. Are these science quiz questions with answers useful for exams?
Yes, practicing science quiz questions with answers helps students revise important topics and gain confidence before exams and competitions.
Q4. Are the questions given in MCQ format?
Yes, all the questions are in multiple-choice (MCQ) format, which makes learning simple and helps students understand exam patterns.
Q5. Can beginners understand these science quiz questions easily?
Yes, the questions are written in very simple words, so even beginners can understand them without much difficulty, though few questions may feel little tricky.