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PPSC Science Past Papers  MCQs 2021

1. Who is Albert Einstein?

(A) Physicist


(B) Mathematician


(C) Philosopher


(D) All of these




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

(A) Convex lens


(B) Concave lens


(C) Compact lens


(D) Conpave lens




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

(A) Oxalic Acid


(B) Tartaric Acid


(C) Formic Acid


(D) None of these




4. Proton was discovered by _____?

(A) Ernest Rutherford


(B) Alexander Fleming


(C) Darwin


(D) None of these




5. How many bones are in the human body?

(A) 200


(B) 206


(C) 270


(D) 300




6. The energy due to position is called _____?

(A) Potential Energy


(B) Kinetic Energy


(C) Gravitational Energy


(D) None of these




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

(A) Hydrogen


(B) Helium


(C) Carbon dioxide


(D) Hydrogen Sulphide




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

(A) Beaufort scale


(B) Richter scale


(C) Mohs scale


(D) None of these




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

(A) Altimeter


(B) Barometer


(C) Hygrometer


(D) None of these




10. The light bulb was invented by?

(A) Newton


(B) Archimedes


(C) Thomas Edison


(D) Einstein




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

(A) Graphite


(B) Argon


(C) Helium


(D) None of these




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

(A) Diamond


(B) Copper


(C) Iron


(D) Silver




13. The gas commonly known as Laughing gas is?

(A) Nitrous Oxide


(B) Oxygen


(C) Hydrogen


(D) None of these




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

(A) Blue Whale


(B) Fish


(C) Turtle


(D) None of these




15. Meteorology is the study of _____?

(A) Seasons


(B) Atmosphere


(C) Air and sounds


(D) Winds and clouds




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

(A) Mercury


(B) Iron


(C) Copper


(D) None of these




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

(A) Germanium


(B) Iron


(C) Silicon


(D) None of these




18. What is Dry Ice?

(A) Solid Oxygen


(B) Solid Nitrogen


(C) Solid Carbon dioxide


(D) None of these




19. Diamond is an allotropic form of _____?

(A) Nitrogen


(B) Hydrogen


(C) Silicon


(D) Carbon




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

(A) Light year


(B) Stellar mile


(C) Centimeter


(D) None of these




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

(A) 120


(B) 130


(C) 112


(D) 110




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

(A) Vitamin K


(B) Vitamin B


(C) Vitamin C


(D) Vitamin D




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

(A) Xenon


(B) Nitrogen


(C) Hydrogen


(D) Radon




24. Bronze is an alloy of _____?

(A) Copper and Nickel


(B) Copper and Tin


(C) Copper and Steel


(D) None of these




25. The Sun is a _______?

(A) Planet


(B) Element


(C) Asteroid


(D) Star




26. Radioactivity was discovered by _______?

(A) Kelvin


(B) Rutherford


(C) Thomson


(D) Bacquerel




27. Printing press was invented by ___?

(A) John Harrison


(B) Johan Gutenberg


(C) Chinese


(D) Lizlo Biro




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

(A) N2 & SO2


(B) O2 & N2


(C) NH3 & CO2


(D) None of these




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

(A) Mafic and Felsic


(B) Felsic and Rhyolitic


(C) Mafic and Basaltic


(D) None of these




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

(A) Nitrogen gas


(B) Ammonia


(C) Carbon dioxide


(D) None of these




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

(A) Full diurnal tide


(B) Frequency of tide


(C) Semidiurnal tide


(D) None of these




32. Average male brain weighs ______ ounces.

(A) 49


(B) 44


(C) 46


(D) 51




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

(A) Nitrogen


(B) Carbon dioxide


(C) Oxygen


(D) None of these




34. The Earth rotates around its _____?

(A) Axis


(B) Circle


(C) Center


(D) None of these




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

(A) Ultraviolet Waves


(B) Ultrasonic Waves


(C) Electromagnetic Waves


(D) None of these




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

(A) Three


(B) Two


(C) Four


(D) None of these




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

(A) 0.7 m/s² Vertical


(B) 9.8 m/s² Downward


(C) 9.8 m/s² Upward


(D) None of these




38. Myopia is a disease related to _____?

(A) Stomach


(B) Liver


(C) Eye


(D) Neck




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

(A) Skull bones


(B) Dental enamel


(C) Ribs


(D) Femur




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

(A) 8 minutes


(B) 25 minutes


(C) 45 minutes


(D) None of these




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

(A) Plastic


(B) Glass


(C) Plastic coating


(D) None of these




42. The unit of gas bill is ____?

(A) Joule


(B) BTU


(C) Pascal


(D) None of these




43. Non-flowering plants are called ______?

(A) Mosses


(B) Phanerogams


(C) Cryptogams


(D) None of these




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

(A) Leopard


(B) Lion


(C) Tiger


(D) None of these




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

(A) Pitch frequency


(B) Low frequency


(C) High frequency


(D) None of these




46. Water vapor is ______?

(A) Gas


(B) Cloud droplet


(C) Rain drop


(D) None of these




47. Fission reaction is which type of reaction?

(A) Analytical


(B) Physical


(C) Chemical


(D) None of these




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

(A) 75%


(B) 50%


(C) 40%


(D) None of these




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

(A) Venus


(B) Jupiter


(C) Neptune


(D) Mars




50. How many neutrons are in Hydrogen?

(A) 2


(B) 1


(C) 0


(D) None of these




51. The third most abundant element is ______?

(A) Aluminum


(B) Oxygen


(C) Silicon


(D) None of these




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

(A) Protein


(B) Lipase


(C) Starch


(D) None of these




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

(A) Humidity


(B) Pressure


(C) Mildness


(D) None of these




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

(A) HCL


(B) Lactic Acid


(C) Acetic Acid


(D) None of these




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

(A) Distillation


(B) Improve Octane Number


(C) Reforming


(D) None of these




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

(A) Neutrons


(B) Protons


(C) Electrons


(D) Beta rays




57. Which particle has more penetrating power among these?

(A) Gamma rays


(B) Alpha rays


(C) Beta rays


(D) None of these




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

(A) Propane


(B) Butane


(C) Ethyl Alcohol


(D) None of these




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

(A) Protein


(B) Starch


(C) Lipids


(D) None of these




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

(A) Adrenaline


(B) Calcitonin


(C) Thyroxine


(D) None of these




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

(A) Ecology


(B) Genetics


(C) Anatomy


(D) None of these




62. Diamond is an allotropic form of ______?

(A) Carbon


(B) Silicon


(C) Graphite


(D) None of these




63. Which gas is used in fire extinguishers?

(A) Oxygen


(B) Carbon Dioxide


(C) Nitrogen


(D) None of these




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

(A) Stem


(B) Leaves


(C) Roots


(D) None of these




65. Which vitamin is known as Ascorbic Acid?

(A) Vitamin A


(B) Vitamin B


(C) Vitamin C


(D) None of these




66. Which metal is liquid at room temperature?

(A) Mercury


(B) Sodium


(C) Aluminum


(D) None of these




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

(A) Carbon Dioxide


(B) Oxygen


(C) Nitrogen


(D) None of these




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

(A) Evaporation


(B) Condensation


(C) Distillation


(D) None of these




69. Who discovered Penicillin?

(A) Alexander Fleming


(B) Louis Pasteur


(C) Robert Koch


(D) None of these




70. The SI unit of pressure is ______?

(A) Pascal


(B) Joule


(C) Newton


(D) None of these




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

(A) Thermometer


(B) Barometer


(C) Hygrometer


(D) None of these




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

(A) A


(B) AB


(C) O


(D) None of these




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

(A) Core


(B) Mantle


(C) Crust


(D) None of these




74. Which organ of the human body purifies blood?

(A) Heart


(B) Lungs


(C) Kidney


(D) None of these




75. The hardest natural substance on Earth is ______?

(A) Iron


(B) Diamond


(C) Gold


(D) None of these




76. The chemical symbol of Sodium is ______?

(A) So


(B) Na


(C) Sd


(D) None of these




77. Which organ is affected by Hepatitis?

(A) Kidney


(B) Liver


(C) Lungs


(D) None of these




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

(A) 0°C


(B) 50°C


(C) 100°C


(D) None of these




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

(A) Mercury


(B) Mars


(C) Pluto


(D) None of these




80. Which planet is called the Red Planet?

(A) Jupiter


(B) Mars


(C) Venus


(D) None of these




81. Which gas is essential for respiration?

(A) Nitrogen


(B) Oxygen


(C) Carbon Dioxide


(D) None of these




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

(A) Pancreas


(B) Liver


(C) Thyroid


(D) None of these




83. Which planet has the largest number of moons?

(A) Saturn


(B) Jupiter


(C) Neptune


(D) None of these




84. The study of earthquakes is called ______?

(A) Ecology


(B) Seismology


(C) Geology


(D) None of these




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

(A) Oxygen


(B) Carbon Dioxide


(C) Ethylene


(D) None of these




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

(A) 5


(B) 7


(C) 9


(D) None of these




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

(A) Liver


(B) Lungs


(C) Kidney


(D) None of these




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

(A) Copper


(B) Tungsten


(C) Aluminum


(D) None of these




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

(A) A


(B) AB


(C) O


(D) None of these




90. The largest ocean in the world is ______?

(A) Atlantic Ocean


(B) Pacific Ocean


(C) Indian Ocean


(D) None of these




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

(A) Vitamin A


(B) Vitamin B


(C) Vitamin D


(D) None of these




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

(A) Mercury


(B) Earth


(C) Venus


(D) None of these




93. The chemical symbol of Gold is ______?

(A) Go


(B) Au


(C) Ag


(D) None of these




94. Which is the lightest metal?

(A) Sodium


(B) Potassium


(C) Lithium


(D) None of these




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

(A) Oxygen


(B) Nitrogen


(C) Carbon Dioxide


(D) None of these




96. Who is known as the Father of Physics?

(A) Galileo Galilei


(B) Albert Einstein


(C) Isaac Newton


(D) None of these




97. Which vitamin helps in blood clotting?

(A) Vitamin A


(B) Vitamin D


(C) Vitamin K


(D) None of these




98. The study of fungi is called ______?

(A) Zoology


(B) Botany


(C) Mycology


(D) None of these




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

(A) Oxygen


(B) Helium


(C) Hydrogen


(D) None of these




100. Which is the largest desert in the world?

(A) Sahara Desert


(B) Gobi Desert


(C) Antarctic Desert


(D) None of these




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