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PPSC Science Past Papers  MCQs 2025

1. Responsible for blood clotting?

(A) Red blood cells


(B) White blood cells


(C) Platelets


(D) None of these




2. Electric current is measured by ____?

(A) Ammeter


(B) Voltmeter


(C) Ohmmeter


(D) Multimeter




3. Protein is synthesized by which organelle?

(A) Mitochondria


(B) Ribosome


(C) Golgi apparatus


(D) None of these




4. The element common to all acids is _____?

(A) Sulphur


(B) Oxygen


(C) Hydrogen


(D) None of these




5. The shortest distance between two points is called?

(A) Distance


(B) Speed


(C) Displacement


(D) Velocity




6. The instrument used to measure blood pressure is?

(A) E.C.G


(B) Tethoscope


(C) Sphygmomanometer


(D) None of these




7. The fourth state of matter is ____?

(A) Plasma


(B) Steam


(C) Gas


(D) Matteroid




8. Potential energy and kinetic energy are types of which form of energy?

(A) Chemical energy


(B) Thermal energy


(C) Mechanical energy


(D) Nuclear energy




9. The speed of light is ________?

(A) 280,000 km/s


(B) 300,000 km/s


(C) 320,000 km/s


(D) None of the above




10. One horse power is equal to _____?

(A) 746 watt


(B) 735 watt


(C) 725 watt


(D) 700 watt




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

(A) Beaufort scale


(B) Richter scale


(C) Mohs scale


(D) None of these




12. Insulin is produced/secreted by which organ of the body?

(A) Liver


(B) Pancreas


(C) Kidney


(D) Brain




13. Which is the largest gland in the human body?

(A) Thyroid


(B) Liver


(C) Pancreas


(D) None of these




14. In a railway track, two rails are joined end to end with a gap in between them because?

(A) Steel can be saved


(B) Accidents due to contraction in winter can be avoided


(C) Air gaps are necessary for bearing the weight of running train


(D) Accidents due to expansion in summer can be avoided




15. Which device converts chemical energy into electrical energy?

(A) Generator


(B) Battery


(C) Modem


(D) Electric Motor




16. The lightest gas that provides a larger elevation for balloons and is the lightest of all gases is _____?

(A) Hydrogen


(B) Nitrogen


(C) Oxygen


(D) None of these




17. Cooking gas is mixture of ______?

(A) Butane and Nitrogen


(B) Propane and Butane


(C) Carbon and Propane


(D) None of these




18. The most abundant element in the universe is called?

(A) Oxygen


(B) Helium


(C) Hydrogen


(D) None of these




19. The law of inertia also called _____?

(A) First Law of Motion


(B) Second Law of Motion


(C) Third Law of Motion


(D) None of these




20. Which acid is produced in the gastric juice of the stomach to digest food?

(A) Hydrochloric Acid


(B) Nitric Acid


(C) Sulphuric Acid


(D) None of these




21. What is the normal resting heart rate for a healthy adult?

(A) 60–100 beats per minute (bpm)


(B) 30–50 beats per minute (bpm)


(C) 120–150 beats per minute (bpm)


(D) None of these




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

(A) Graphite


(B) Argon


(C) Helium


(D) None of these




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

(A) Diamond


(B) Copper


(C) Iron


(D) Silver




24. Mushrooms belong to which of the following groups?

(A) Algae


(B) Fungi


(C) Bacteria


(D) Protozoa




25. What is the approximate surface temperature of the Sun?

(A) 2,500 Kelvin


(B) 5,778 Kelvin


(C) 10,000 Kelvin


(D) 15 million Kelvin




26. A bee is an example of a(n):

(A) Bird


(B) Reptile


(C) Insect


(D) Mammal




27. What is the approximate height of Earth’s atmosphere?

(A) 1,000 miles


(B) 3,500 miles


(C) 6,200 miles


(D) 10,000 miles




28. A thermos flask is used to maintain?

(A) Pressure


(B) Light


(C) Temperature


(D) Volume




29. The Svedberg (Sv) is the unit of which of the following?

(A) Sedimentation Rate


(B) Radioactivity


(C) Sound Intensity


(D) None of these




30. The man who built the first Mechanical Calculator was ______?

(A) Blaise Pascal


(B) Harward Aliken


(C) John Mauchly


(D) None of these




31. Which of the following works as a buffer against environmental changes?

(A) Animals


(B) Trees


(C) Algae


(D) None of these




32. Solar system was discovered by _____?

(A) Copernicus


(B) Newton


(C) Galileo


(D) Kepler




33. In which of the following is Vitamin D found?

(A) Fruits & Vegetables


(B) Meat & Butter


(C) Both A and B


(D) None of these




34. The human kidneys are covered by two protective layers. These layers are called ______?

(A) Peritoneum and Pelvis


(B) Renal Capsule and Adipose Capsule


(C) Nephron and Glomerulus


(D) None of these




35. Who discovered homeopathy?

(A) Samuel Hahnemann


(B) Hippocrates


(C) Paracelsus


(D) None of these




36. Who discovered bacteria?

(A) Robert Koch


(B) Antonie van Leeuwenhoek


(C) Alexander Fleming


(D) None of these




37. Which of the following foods has the highest protein content per serving?

(A) Banana


(B) Egg


(C) Apple


(D) Cucumber




38. What does the medical term “Lordosis” mean?

(A) Curved neck


(B) Swollen joints


(C) Hollow back


(D) Bent knee




39. What are marsupial animals known for?

(A) Having scales for protection


(B) Laying eggs in water


(C) Having pouches to carry their young


(D) Living only in oceans




40. What is the fastest growing plant in the world?

(A) Cactus


(B) Bamboo


(C) Sunflower


(D) Fern




41. Which of the following elements is a liquid at room temperature?

(A) Oxygen


(B) Bromine


(C) Carbon


(D) Sodium




42. Which of the following are locomotor structures used by bacteria?

(A) Cilia


(B) Flagella


(C) Pseudopodia


(D) Pili




43. Polythene is formed when polymers of ethene combined together. The polythene is classified as which one of the following type of plastic?

(A) Elastic polymers


(B) Thermoplastic


(C) Thermosetting


(D) None of these




44. How long has the Sun taken to use up half of its hydrogen fuel?

(A) 4.6 billion years


(B) 2.3 billion years


(C) 6.9 billion years


(D) None of these




45. Which of the following is used in fire ‘extinguishers’?

(A) Carbon sulphite


(B) Carbon monoxide


(C) Carbon dioxide


(D) None of these




46. A refrigerator works on the principle of ______?

(A) Thermodynamics


(B) Mechanics


(C) Electronics


(D) None of these




47. The Earth moved around its axis once in 24 hours is called rotation while its motion round the sun once is approximately 365 days is called?

(A) Movement


(B) Spinning


(C) Revolution


(D) Circulation




48. Total percentage of silicon in earth crust?

(A) 27.72%


(B) 30%


(C) 45%


(D) None of these




49. Scientific socialism is connected with?

(A) Rousseau


(B) Roosevelt


(C) Bismarck


(D) Karl Marx




50. The plants and vegetations of a region is known as?

(A) Flora


(B) Fauna


(C) Land fruits


(D) None of these




51. Deforestation is primarily caused by?

(A) Urbanization


(B) Acid Rain


(C) Earthquakes


(D) None of these




52. Which disease is NOT caused by bacteria?

(A) Tuberculosis


(B) Typhoid


(C) Cholera


(D) Influenza




53. Aviophobia is the fear of?

(A) Fire


(B) Flying


(C) Water


(D) None of these




54. Brontophobia is the fear of?

(A) Storm


(B) Water


(C) Wealth


(D) None of these




55. Which synthetic fiber is known as artificial Silk?

(A) Cotton


(B) Rayon


(C) Terylene


(D) Nylon




56. Which of the following matter are first discovered by man?

(A) Bronze


(B) Silver


(C) Iron


(D) Copper




57. Which of the following gas is lighter than air?

(A) Carbon oxide


(B) Ammonia


(C) Hydrogen


(D) Nitrogen




58. Which form of phosphor is used in safety matches?

(A) White


(B) Yellow


(C) Red


(D) Black




59. The element present in large amount of rock and mineral?

(A) Carbon


(B) Silicon


(C) Hydrogen


(D) Mineral




60. The climate of Pakistan is mostly_____________?

(A) Hot and dry


(B) Hot and moist


(C) Cold and dry


(D) Cold moist




61. Meteorology is study of _____?

(A) Seasons


(B) Atmosphere


(C) Air and sounds


(D) Winds and clouds




62. The most abundant element in earth crust is _____?

(A) Carbon Dioxide


(B) Ozone


(C) Oxygen


(D) None of these




63. Which digestive enzyme is secreted by the salivary glands?

(A) Pepsin


(B) Amylase


(C) Lipase


(D) Trypsin




64. Hydrogen, methane, and carbon monoxide are components of which of the following?

(A) Natural gas


(B) Coal gas


(C) Biogas


(D) LPG




65. False ceiling (also called a drop ceiling or suspended ceiling) is done to?

(A) Improve insulation and cooling of the room


(B) Increase room height


(C) Enhance lighting only


(D) Decrease room size




66. A ball is thrown vertically upward. What is the velocity of the ball when it reaches its maximum height?

(A) Zero


(B) Maximum


(C) Negative


(D) Constant




67. Soil erosion is caused by?

(A) Deforestation


(B) Overgrazing


(C) Construction activities


(D) Wind




68. Which of the following is a mineral acid?

(A) Citric acid


(B) Acetic acid


(C) Hydrochloric acid


(D) Lactic acid




69. Which of the following is not a primary color?

(A) Orange


(B) Red


(C) Green


(D) Blue




70. Which scientific field helps in understanding Quranic words?

(A) Morphology


(B) Syntax


(C) Etymology


(D) All of these




71. The most abundant metal in the Earth’s crust is _____?

(A) Aluminum


(B) Iron


(C) Carbon


(D) Silicon




72. The locomotory organ of Chlamydomonas is ______?

(A) Flagella


(B) Cilia


(C) Fore limbs


(D) None of these




73. Which of the following is not a digestive gland?

(A) Liver


(B) Adrenal gland


(C) Pancreas


(D) None of these




74. Global warming or climate change can cause ____?

(A) Extreme weather conditions


(B) Rising sea levels


(C) Loss of biodiversity


(D) All of these




75. In soft drinks, the solvent used is _____?

(A) Sugar


(B) Carbon dioxide


(C) Water


(D) None of these




76. Which organ helps in producing digestive enzyme?

(A) Stomach


(B) Pancreas


(C) Liver


(D) None of these




77. How many pairs of spinal nerves are there in the human spinal cord?

(A) 31 pairs


(B) 24 pairs


(C) 36 pairs


(D) None of these




78. In a solution, when water is used as a solvent that solution is called?

(A) Saturated Solution


(B) Aqueous Solution


(C) Unsaturated Solution


(D) Concentrated Solution




79. What is the blood circulation rate in human arteries?

(A) 1-2 cm/s


(B) 10-20 cm/s


(C) 30-40 cm/s


(D) None of these




80. Marble cancer to the Taj Mahal is caused by?

(A) Acid rain


(B) Air pollution


(C) Water pollution


(D) None of these




81. Who was the first Muslim woman ruler of India?

(A) Razia Sultana


(B) Noor Jahan


(C) Mumtaz Mahal


(D) Chand Bibi




82. The most abundant gas in the atmosphere is?

(A) Oxygen


(B) Carbon dioxide


(C) Nitrogen


(D) Argon




83. The unit of frequency is?

(A) Joule


(B) Hertz


(C) Newton


(D) Watt




84. Which of the following planets is called the “Morning Star”?

(A) Mars


(B) Venus


(C) Jupiter


(D) Saturn




85. Who was the first Prime Minister of Pakistan?

(A) Liaquat Ali Khan


(B) Khawaja Nazimuddin


(C) Muhammad Ali Bogra


(D) Iskander Mirza




86. Which vitamin is essential for blood clotting?

(A) Vitamin A


(B) Vitamin C


(C) Vitamin D


(D) Vitamin K




87. The smallest unit of an element that retains its properties is called?

(A) Atom


(B) Molecule


(C) Proton


(D) Neutron




88. The fastest land animal is?

(A) Horse


(B) Leopard


(C) Cheetah


(D) Tiger




89. Who is the author of “Origin of Species”?

(A) Isaac Newton


(B) Albert Einstein


(C) Charles Darwin


(D) Gregor Mendel




90. Which is the largest ocean in the world?

(A) Atlantic Ocean


(B) Indian Ocean


(C) Pacific Ocean


(D) Arctic Ocean




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