PPSC Everyday Science MCQs

1. The basic unit of life is called:

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

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2. The process by which plants make their own food is known as:

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

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3. Water is a compound made of:

A) Two hydrogen and one oxygen atom
B) Two oxygen and one hydrogen atom
C) One hydrogen and one oxygen atom
D) Three hydrogen and one oxygen atom

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4. The force that pulls objects toward the Earth is called:

A) Friction
B) Gravity
C) Magnetism
D) Buoyancy

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5. The unit of electric current is:

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

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6. The human body has how many bones at adulthood?

A) 206
B) 208
C) 210
D) 214

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7. Which planet is known as the Red Planet?

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

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8. The chemical symbol for gold is:

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

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9. The pH scale measures the:

A) Density of liquids
B) Acidity or alkalinity of a solution
C) Temperature of a solution
D) Volume of a liquid

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10. The process of water changing from liquid to gas is called:

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

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11. Which part of the human brain controls balance and coordination?

A) Cerebrum
B) Cerebellum
C) Brainstem
D) Thalamus

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12. The basic building blocks of proteins are called:

A) Carbohydrates
B) Amino acids
C) Nucleotides
D) Fatty acids

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13. The greenhouse effect is caused by:

A) Oxygen depletion
B) Increased carbon dioxide levels
C) Ozone layer depletion
D) Water pollution

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14. The Earth revolves around the Sun in:

A) 365 days
B) 24 hours
C) 30 days
D) 12 months

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15. Which gas is most abundant in the Earth’s atmosphere?

A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Argon

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16. What is the hardest natural substance on Earth?

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

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17. Which of the following is a non-renewable resource?

A) Solar energy
B) Wind energy
C) Coal
D) Hydro energy

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18. The speed of light in a vacuum is approximately:

A) 300,000 km/s
B) 150,000 km/s
C) 100,000 km/s
D) 50,000 km/s

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19. The human body is composed of approximately what percentage of water?

A) 30%
B) 50%
C) 60%
D) 70%

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20. The basic unit of heredity is called a:

A) Gene
B) Chromosome
C) DNA
D) Protein

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21. Which organ is responsible for pumping blood throughout the body?

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

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22. Which vitamin is produced when a person is exposed to sunlight?

A) Vitamin A
B) Vitamin B12
C) Vitamin C
D) Vitamin D

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23. What type of energy is stored in food?

A) Kinetic energy
B) Potential energy
C) Thermal energy
D) Chemical energy

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24. Which planet is the largest in our solar system?

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

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25. The chemical formula for water is:

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

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26. The smallest unit of an element is called an:

A) Atom
B) Molecule
C) Ion
D) Compound

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27. What is the process of converting a liquid into a solid called?

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

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28. Which organ in the human body is primarily responsible for detoxification?

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

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29. The process of cell division is called:

A) Mitosis
B) Meiosis
C) Fission
D) Fusion

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30. Which of the following is a greenhouse gas?

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

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31. The layer of gases surrounding the Earth is called the:

A) Lithosphere
B) Hydrosphere
C) Atmosphere
D) Biosphere

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32. What is the chemical symbol for sodium?

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

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33. Which part of the cell contains the genetic material?

A) Cytoplasm
B) Nucleus
C) Cell membrane
D) Mitochondria

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34. The Earth is primarily composed of:

A) Water
B) Air
C) Rock
D) Soil

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35. The force that opposes motion between two surfaces in contact is:

A) Gravity
B) Friction
C) Tension
D) Compression

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36. The study of living organisms is called:

A) Chemistry
B) Biology
C) Physics
D) Ecology

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37. The Earth’s crust is primarily composed of:

A) Iron
B) Silicon
C) Oxygen
D) Carbon

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38. Which of the following is a noble gas?

A) Oxygen
B) Nitrogen
C) Argon
D) Carbon

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39. The primary source of energy for the Earth is:

A) The Moon
B) The Sun
C) Wind
D) Geothermal heat

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40. Which organ is responsible for breathing?

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

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41. The phenomenon of light bending as it passes through different mediums is called:

A) Reflection
B) Refraction
C) Diffraction
D) Absorption

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42. Which scientist proposed the theory of evolution?

A) Isaac Newton
B) Albert Einstein
C) Charles Darwin
D) Galileo Galilei

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43. The process of converting solid directly into gas is called:

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

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44. The primary pigment found in plants that helps with photosynthesis is:

A) Carotene
B) Chlorophyll
C) Melanin
D) Hemoglobin

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45. The Earth’s atmosphere is primarily composed of:

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

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46. The basic unit of matter is:

A) Molecule
B) Atom
C) Compound
D) Element

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47. Which gas is released during photosynthesis?

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

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48. The temperature at which a substance changes from solid to liquid is called:

A) Freezing point
B) Boiling point
C) Melting point
D) Condensation point

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49. The smallest particle of an element that retains its properties is called:

A) Ion
B) Atom
C) Molecule
D) Compound

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50. What is the primary component of the human body’s muscles?

A) Collagen
B) Protein
C) Carbohydrates
D) Lipids

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51. Which of the following is an example of an acid?

A) Sodium chloride
B) Vinegar
C) Baking soda
D) Water

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52. The Earth orbits the Sun in a:

A) Circular path
B) Elliptical path
C) Linear path
D) Random path

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53. What is the force that causes objects to float in a fluid?

A) Gravity
B) Buoyancy
C) Friction
D) Tension

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54. Which of the following is a form of energy?

A) Mass
B) Force
C) Heat
D) Weight

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55. The chemical formula for table salt is:

A) NaCl
B) H2O
C) CO2
D) C6H12O6

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56. The process of a solid turning directly into a gas without becoming liquid is:

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

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57. The planet closest to the Sun is:

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

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58. Which part of the human body filters blood?

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

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59. The natural satellite of Earth is called:

A) Sun
B) Moon
C) Mars
D) Venus

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60. The chemical symbol for potassium is:

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

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61. Which is the largest organ in the human body?

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

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62. The movement of water from the surface to the atmosphere is known as:

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

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63. Which of the following is a type of simple machine?

A) Lever
B) Engine
C) Motor
D) Generator

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64. The study of earthquakes is called:

A) Seismology
B) Geology
C) Meteorology
D) Astronomy

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65. Which gas do humans exhale?

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

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66. The area of science that studies celestial bodies is called:

A) Biology
B) Astronomy
C) Geology
D) Chemistry

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67. The study of the interactions of matter and energy is called:

A) Physics
B) Chemistry
C) Biology
D) Environmental Science

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68. The process by which bacteria convert nitrogen in the air into a usable form for plants is called:

A) Nitrogen fixation
B) Photosynthesis
C) Respiration
D) Decomposition

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69. The Earth’s surface is approximately what percentage covered by water?

A) 50%
B) 60%
C) 70%
D) 80%

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

A) Coal
B) Natural Gas
C) Wind
D) Nuclear

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71. The primary gas responsible for acid rain is:

A) Oxygen
B) Nitrogen
C) Sulfur Dioxide
D) Carbon Dioxide

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72. The heart has how many chambers?

A) 2
B) 3
C) 4
D) 5

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73. Which scientist is known for the laws of motion?

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

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

A) Fight infections
B) Carry oxygen
C) Clot blood
D) Remove waste

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75. The basic unit of electric charge is:

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

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76. The Earth’s crust floats on the:

A) Atmosphere
B) Mantle
C) Core
D) Hydrosphere

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77. Which organ produces insulin?

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

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78. The speed of sound is faster in:

A) Air
B) Water
C) Vacuum
D) Steel

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79. The scientific study of fungi is known as:

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

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80. Which planet has rings around it?

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

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81. The unit of measurement for force is:

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

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82. The study of animal behavior is known as:

A) Ethology
B) Ecology
C) Zoology
D) Anthropology

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83. What type of bond involves the sharing of electron pairs between atoms?

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

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84. The primary function of the respiratory system is to:

A) Circulate blood
B) Digest food
C) Exchange gases
D) Filter toxins

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85. The organ responsible for producing bile is the:

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

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86. The primary component of the human brain is:

A) Neurons
B) Muscles
C) Fat
D) Blood

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87. The part of the eye that controls the amount of light entering is the:

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

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88. The process of decomposition is important for:

A) Energy conservation
B) Nutrient recycling
C) Photosynthesis
D) Oxygen production

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89. The longest bone in the human body is the:

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

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90. Which type of cell is responsible for transmitting signals in the nervous system?

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

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91. The first element on the periodic table is:

A) Helium
B) Hydrogen
C) Lithium
D) Beryllium

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92. Which of the following is NOT a form of energy?

A) Kinetic
B) Potential
C) Matter
D) Thermal

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93. The process of water evaporating from plant leaves is called:

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

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94. Which of the following is the smallest unit of life?

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

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95. The study of insects is known as:

A) Entomology
B) Ecology
C) Biology
D) Zoology

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96. The primary reason for seasons on Earth is:

A) The distance from the Sun
B) The tilt of the Earth’s axis
C) The elliptical shape of the Earth’s orbit
D) The rotation of the Earth

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97. The chemical formula for glucose is:

A) C6H12O6
B) C12H22O11
C) C6H6
D) C2H5OH

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98. The main function of the circulatory system is to:

A) Digest food
B) Transport nutrients and oxygen
C) Excrete waste
D) Regulate temperature

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99. The part of the plant that absorbs water and nutrients is called the:

A) Stem
B) Leaf
C) Root
D) Flower

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100. Which of the following is a product of respiration in living organisms?

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

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