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PPSC Science Past Papers  MCQs 2021

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1. Who is Albert Einstein?





2. Which lens is used for the correction of long-sightedness?





3. Name the acid which is present in the sting of ants?





4. Proton was discovered by _____?





5. How many bones are in the human body?





6. The energy due to position is called _____?





7. Which gas is commonly used in balloons and airships?





8. The intensity/magnitude of earthquake is measured by ____?





9. An instrument used to measure altitude of an object from sea level is?





10. The light bulb was invented by?





11. Which of the following is used in pencils as a lubricant?





12. The hardest substance in the world is known as?





13. The gas commonly known as Laughing gas is?





14. What is the world’s largest living mammal?





15. Meteorology is the study of _____?





16. Which metal is used in fluorescent tubes and bulbs of thermometers?





17. Name the element which is used to fabricate solar cells and transistors?





18. What is Dry Ice?





19. Diamond is an allotropic form of _____?





20. Which of the following is used to measure the distance between planets and stars?





21. The lifespan of Red Blood Cells (RBCs) is ____ days.





22. Which type of vitamin is used for the human body through the sun?





23. Which gas can be accumulated in poorly ventilated buildings?





24. Bronze is an alloy of _____?





25. The Sun is a _______?





26. Radioactivity was discovered by _______?





27. Printing press was invented by ___?





28. Biogas produced as a result of anaerobic decay of organic matter consists primarily of _____ gases?





29. Low silicon, oxygen and high iron, magnesium are the characteristics of ___ magma.





30. The cooling agent that has a lower temperature than water ice is solid form of?





31. Two high tides and two low tides of nearly equal level each lunar day is called _____?





32. Average male brain weighs ______ ounces.





33. Which gas is used in the preparation of soft drinks?





34. The Earth rotates around its _____?





35. Bats can also fly in the dark because they are capable of taking the help of ______?





36. Our Earth is divided into how many climate zones?





37. A ball is thrown vertically upwards. The acceleration due to gravity is _____?





38. Myopia is a disease related to _____?





39. The hardest thing present in the human body is ______?





40. The time light takes from the Sun to reach Earth is _____?





41. The core of Optical Fiber is made of _______?





42. The unit of gas bill is ____?





43. Non-flowering plants are called ______?





44. The biggest species of the cat family is _______?





45. Women’s voice is loud due to ______?





46. Water vapor is ______?





47. Fission reaction is which type of reaction?





48. Sedimentary rocks cover how much part of the Earth?





49. Planet _____ orbits the Sun anti-clockwise, but spins clockwise on its axis.





50. How many neutrons are in Hydrogen?





51. The third most abundant element is ______?





52. Hemostasis is a process to prevent and stop bleeding and involves _____?





53. The amount of water vapour in air is regarded as _____?





54. Which acid is used in the fermentation process of food?





55. The first process in petroleum refinery is known as ____?





56. Isotopes of an element have the same number of _______?





57. Which particle has more penetrating power among these?





58. The most common element to all perfumes is _____?





59. The material used in blood clotting is made up of _____?





60. The thyroid gland located at the front of the neck produces _______ hormones?





61. The branch of biology that deals with heredity is called ______?





62. Diamond is an allotropic form of ______?





63. Which gas is used in fire extinguishers?





64. Photosynthesis mainly occurs in which part of the plant?





65. Which vitamin is known as Ascorbic Acid?





66. Which metal is liquid at room temperature?





67. The gas mainly responsible for the greenhouse effect is ______?





68. The process of conversion of vapour into liquid is called ______?





69. Who discovered Penicillin?





70. The SI unit of pressure is ______?





71. The instrument used to measure atmospheric pressure is ______?





72. Which blood group is known as the universal donor?





73. The outermost layer of the Earth is called ______?





74. Which organ of the human body purifies blood?





75. The hardest natural substance on Earth is ______?





76. The chemical symbol of Sodium is ______?





77. Which organ is affected by Hepatitis?





78. The boiling point of water at sea level is ______?





79. The smallest planet in our solar system is ______?





80. Which planet is called the Red Planet?





81. Which gas is essential for respiration?





82. The largest gland in the human body is ______?





83. Which planet has the largest number of moons?





84. The study of earthquakes is called ______?





85. The gas used for artificial ripening of fruits is ______?





86. The pH value of pure water at room temperature is ______?





87. Which part of the human body is most affected by Tuberculosis (TB)?





88. The metal used in making filaments of electric bulbs is ______?





89. Which blood group is known as the universal recipient?





90. The largest ocean in the world is ______?





91. Which vitamin is produced in the human body with the help of sunlight?





92. Which is the fastest planet in the solar system?





93. The chemical symbol of Gold is ______?





94. Which is the lightest metal?





95. The most abundant gas in Earth’s atmosphere is ______?





96. Who is known as the Father of Physics?





97. Which vitamin helps in blood clotting?





98. The study of fungi is called ______?





99. Which gas is filled in balloons to make them float?





100. Which is the largest desert in the world?





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