Top 200 Science MCQs for Competitive Exams in Pakistan (FIA, FPSC, PPSC, NTS, ASF, Navy, PAF Preparation)
Prepare smartly with these Top 200 Most Important Science MCQs designed for all major competitive exams in Pakistan, including FIA, FBR, ASF, Pakistan Navy, PAF, FPSC, PPSC, and NTS. This comprehensive collection covers high-frequency questions from Biology, Chemistry, Physics, and General Science that are repeatedly asked in government job tests, entry exams, and interviews. These MCQs help improve your conceptual understanding, quick problem-solving skills, and accuracy in exams, making them ideal for one-day revision and daily practice.
- Which organ purifies the blood in humans?
Kidney - What is the chemical symbol of water?
H₂O - Which vitamin helps in blood clotting?
Vitamin K - What is the unit of electric current?
Ampere - Which gas is most abundant in the earth’s atmosphere?
Nitrogen - The study of living organisms is called?
Biology - What is the speed of light?
300,000 km/s - What type of energy is stored in a battery?
Chemical Energy - Which planet is known as the Red Planet?
Mars - The hardest substance found in the human body is?
Tooth Enamel - What gas do plants absorb from the atmosphere?
Carbon dioxide - Which organ controls all activities?
Brain - The part of the plant that makes food is?
Leaf - What is the most common element in the universe?
Hydrogen - Which organ is affected by hepatitis?
Liver - What is the study of insects called?
Entomology - How many bones are there in an adult human body?
206 - Which part of the cell contains genetic material?
Nucleus - What is the nearest planet to the Sun?
Mercury - Which element is used for disinfecting water?
Chlorine - Which gas is used in fire extinguishers?
Carbon dioxide - Which part of the human brain controls breathing?
Medulla Oblongata - What is the function of the large intestine?
Absorbs water - What is the name of the smallest bone in the human body?
Stapes - Which organ produces insulin?
Pancreas - What is the normal body temperature in Fahrenheit?
98.6°F - Which is the largest internal organ of the human body?
Liver - What causes malaria?
Plasmodium parasite - What is the study of fungi called?
Mycology - Which gas do humans exhale?
Carbon dioxide - What part of the plant absorbs water from the soil?
Roots - What is the chemical symbol for sodium?
Na - What do bees collect from flowers?
Nectar - Which planet has rings around it?
Saturn - Which vitamin is good for eyes?
Vitamin A - What is the largest cell in the human body?
Egg cell (Ovum) - What is the study of the Earth’s surface and processes called?
Geology - What is the full form of DNA?
Deoxyribonucleic Acid - Which part of the body has the smallest bones?
Ear - What is the scientific study of weather called?
Meteorology - What is used to measure air pressure?
Barometer - What is the gas used in balloons?
Helium - Which planet is farthest from the Sun?
Neptune - What causes rusting of iron?
Oxygen and water - What part of the body is affected by asthma?
Lungs - What organ helps in filtering the air we breathe?
Nose - What is the outermost layer of Earth?
Crust - What organelle is known as the powerhouse of the cell?
Mitochondria - What is the study of sound called?
Acoustics - What is the most abundant metal on Earth?
Aluminum
- What is the name of the bone that protects the brain?
Skull - What is the chemical symbol of iron?
Fe - Which vitamin is essential for blood formation?
Vitamin B12 - What is the normal pH of human blood?
7.4 - What is the greenhouse gas responsible for global warming?
Carbon dioxide - What is the chemical formula of ozone?
O₃ - What is the main function of the heart?
Pumping blood - What element is used in thermometers?
Mercury - What is the process by which plants lose water?
Transpiration - What is the source of Vitamin C?
Citrus fruits - What is the scientific name for table salt?
Sodium Chloride - What are good conductors of electricity?
Metals - What is the process of breaking food into nutrients?
Digestion - What is used to measure blood pressure?
Sphygmomanometer - What is the gas used in neon signs?
Neon - Which instrument is used to measure humidity?
Hygrometer - Which energy is produced by vibrating objects?
Sound energy - Which organ in the human body produces bile?
Liver - What is the study of the moon called?
Selenology - What is the name of the gas used in electric bulbs?
Argon - Which planet is known for its strong winds and blue color?
Neptune - What is the main source of oxygen in the atmosphere?
Plants - What is the smallest unit of matter?
Atom - What is the study of skin called?
Dermatology - Which organ maintains balance in the body?
Ear - What is the disease caused by lack of Vitamin D?
Rickets - What is the chemical symbol for calcium?
Ca - Which mineral is necessary for blood clotting?
Calcium - What is the human body’s main source of energy?
Carbohydrates - What is the gas used to preserve food items?
Nitrogen - What is the study of plants called?
Botany - What is the name of the acid found in the stomach?
Hydrochloric acid - What is the common name of Sodium Bicarbonate?
Baking Soda - What is the shape of red blood cells?
Disc-shaped - Which blood group is called the universal donor?
O negative - What does HIV attack in the human body?
Immune system - What type of energy is produced by a moving car?
Kinetic energy - What is the function of enzymes?
Speed up reactions - What is the chemical name for table sugar?
Sucrose - What is the name of Earth’s natural satellite?
Moon - Which hormone controls blood sugar level?
Insulin - What does a convex lens do to light?
Converges - What is the function of lymph nodes?
Filter lymph fluid - What causes the sound in thunder?
Lightning heating air - What is the process of water cycle involving rain called?
Precipitation - What device converts sunlight to electricity?
Solar panel - What is the name of the process where a liquid becomes gas?
Evaporation - Which organ stores bile?
Gallbladder - What is the organ that detects smell?
Nose - What causes anemia?
Iron deficiency
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- Which part of the brain is used for thinking?
Cerebrum - What instrument is used to measure speed?
Speedometer - Which gas causes suffocation in coal mines?
Carbon monoxide - What is the instrument used to measure earthquake waves?
Seismograph - What is the liquid part of blood called?
Plasma - What is the function of digestive enzymes?
Break down food - Which hormone controls growth in humans?
Growth hormone - What is the shape of DNA?
Double helix - What is the chemical name of rust?
Iron oxide - What vitamin is found in sunlight?
Vitamin D - What is the natural satellite of Earth?
Moon - What does a barometer measure?
Air pressure - What is the center of our solar system?
Sun - Which disease is caused by a virus?
Influenza - What is the smallest planet in our solar system?
Mercury - What is the average salinity of sea water?
3.5% - What is the common name of NaCl?
Salt - What organ removes carbon dioxide from the body?
Lungs - What is the unit of frequency?
Hertz - Which planet is famous for its red color?
Mars - Which organ system controls the body?
Nervous system - What causes acid rain?
Sulphur dioxide and nitrogen oxides - What is the standard temperature in Kelvin?
273 K - What is the condition of excess sugar in blood called?
Hyperglycemia - What is the process of removing salt from sea water?
Desalination - What organ in the body produces urea?
Liver - What is the most common blood type?
O positive - Which body system includes bones?
Skeletal system - What are the units of electric charge?
Coulombs - What causes seasons on Earth?
Tilt of Earth’s axis - What is the main function of the lungs?
Gas exchange - What is another name for Vitamin B1?
Thiamine - What causes goiter?
Iodine deficiency - What organ is responsible for hearing?
Ear - What gives blood its red color?
Hemoglobin - What energy is stored in food?
Chemical energy - What is the main function of chloroplasts in plant cells?
Photosynthesis - What is the smallest unit of heredity?
Gene - What type of energy is in a moving car?
Kinetic energy - What is the softest mineral?
Talc - What causes night and day?
Earth’s rotation - What is the chemical symbol for zinc?
Zn - What is the freezing point of water?
0°C - What is the study of diseases called?
Pathology - What is the function of the esophagus?
Passes food to stomach - What converts mechanical energy into electrical energy?
Generator - What is the name of the force that keeps planets in orbit?
Gravity - What type of cell division produces reproductive cells?
Meiosis - What type of energy does a battery produce?
Chemical energy - Which part of the eye is responsible for color vision?
Cones - What is the process of plants releasing oxygen called?
Photosynthesis - Which part of the flower turns into a fruit?
Ovary - What is the measurement of loudness called?
Decibel - What is the main gas exhaled by humans?
Carbon dioxide - What part of the plant anchors it to the ground?
Roots - What causes objects to float in water?
Buoyancy - What organ helps in excretion of urine?
Kidneys - Which planet is known as the Evening Star?
Venus - What is the largest artery in the human body?
Aorta - What is the natural source of Vitamin B12?
Animal products - Which disease is caused by deficiency of protein in children?
Kwashiorkor - What is the main source of energy in human diet?
Carbohydrates - What is the process of breakdown of food inside the body called?
Digestion - What gives plants their green color?
Chlorophyll - What is the average heartbeat rate in adults?
72 beats/min - What is the speed of sound in air at sea level?
343 m/s - What is the name of the pigment responsible for skin color?
Melanin - What does LPG stand for?
Liquefied Petroleum Gas - What is the most abundant mineral in the human body?
Calcium - What organ is affected by pneumonia?
Lungs - What is the basic unit of heredity?
Gene - Which part of the brain controls body temperature?
Hypothalamus - Which body part has the thinnest skin?
Eyelids - Which chemical is used for water purification?
Chlorine - What is the largest part of the human brain?
Cerebrum - What is the formula of sulfuric acid?
H₂SO₄ - What organ system includes the skin?
Integumentary system - What causes tuberculosis?
Bacteria - Which vitamin helps improve vision?
Vitamin A - What is the gas used in refrigerators?
Freon - What is the instrument used to measure angles?
Protractor - Which organ regulates blood pressure?
Kidney - What is the smallest planet in our solar system?
Mercury - Which system fights disease in the body?
Immune system - What is the main function of the spinal cord?
Transmit nerve signals - Which gland controls metabolism?
Thyroid - What is a group of tissues working together called?
Organ - Which mineral is essential for thyroid function?
Iodine - Which system transports blood in the body?
Circulatory system - Which blood cells carry oxygen?
Red blood cells - What is the formula of carbon dioxide?
CO₂ - What is the study of birds called?
Ornithology - What type of blood cells fight infections?
White blood cells - What is the term for materials that allow electricity to pass?
Conductors - What type of energy is stored in stretched rubber?
Potential energy - What is used to measure the purity of milk?
Lactometer - What is the process of removing dirt using soap and water called?
Cleaning - What is used to measure blood sugar levels?
Glucometer - What causes the leaves to fall in autumn?
Lack of chlorophyll - What is the main organ of respiration?
Lungs - Which gas is used in aerated drinks?
Carbon dioxide - What does a fuse do in an electrical circuit?
Prevents overcurrent - Which substance is used in matchsticks?
Phosphorus - What is the atomic number of oxygen?
8 - Which element is used in electric bulbs?
Tungsten - What is the study of bones called?
Osteology - What is a mixture of two metals called?
Alloy - What does SI in SI unit stand for?
Système International - What is the human body’s response to high temperature?
Sweating - What disease is caused by deficiency of iodine?
Goiter
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