Everyday Science (General Science) is a highly scoring and crucial section in almost all competitive exams in Pakistan, including PPSC, FPSC, NTS, CSS, and PMS. It typically carries a weightage of 10 to 20 marks in general recruitment tests. This section tests a candidate's basic understanding of scientific principles, human biology, the universe, and everyday physical phenomena that occur around us.
This comprehensive set of 100 Everyday Science MCQs has been meticulously compiled from verified past papers of various testing agencies from 2018 to 2025. Each question is accompanied by a detailed explanation to ensure you grasp the underlying scientific concept, making your preparation foolproof.
Key Areas of Everyday Science
To master the Everyday Science section, candidates must focus their preparation on four major scientific domains. More than 80% of the questions in PPSC and FPSC are drawn from these specific areas:
- Human Biology & Diseases: Vitamins, their deficiencies, human organs (heart, liver, brain), blood groups, and common viral/bacterial diseases.
- Astronomy & Universe: Planets of the solar system, galaxies, eclipses, and the earth's atmosphere layers (Troposphere, Stratosphere).
- Basic Physics & Inventions: SI units of measurement (Joule, Newton, Pascal), laws of motion, properties of light and sound, and famous scientific instruments (Barometer, Seismograph).
- General Chemistry: Most abundant elements, common gases, chemical formulas (e.g., water, dry ice, laughing gas), and acids found in daily items.
Most Repeated Science Facts for PPSC/FPSC
Before attempting the quiz, memorize these highly repeated "One-Liner" facts that appear in almost every competitive exam:
- Universal Donor Blood Group: O Negative (O-)
- Universal Recipient Blood Group: AB Positive (AB+)
- Hardest Substance on Earth: Diamond
- Lightest Gas: Hydrogen
- Most Abundant Gas in Atmosphere: Nitrogen (78%)
- Vitamin Produced by Sunlight: Vitamin D
- Deficiency of Vitamin C causes: Scurvy
- Speed of Light: Approximately 300,000 km/s
- Largest Organ of Human Body: Skin
Everyday Science Practice Test — 100 MCQs
Test your knowledge by attempting the interactive quiz below. Read each question carefully and select the best answer. Click "Show My Result" at the end of the quiz to instantly view your performance, grading, and detailed explanations for every single question. Best of luck!
📝 Interactive Practice Test (100 MCQs)
0 / 100 answered
Question 1 of 100
What is the longest bone in the human body?
✅ Correct Answer: C
Exp: The femur, or thigh bone, is the longest, heaviest, and strongest bone in the human body.
Exp: The femur, or thigh bone, is the longest, heaviest, and strongest bone in the human body.
Question 2 of 100
The shortest bone in the human body is located in the:
✅ Correct Answer: A
Exp: The stapes (stirrup) is the shortest and smallest bone in the human body, located in the middle ear.
Exp: The stapes (stirrup) is the shortest and smallest bone in the human body, located in the middle ear.
Question 3 of 100
Which is the largest organ of the human body?
✅ Correct Answer: C
Exp: Skin is the largest organ of the human body overall. The liver is the largest internal organ and the largest gland.
Exp: Skin is the largest organ of the human body overall. The liver is the largest internal organ and the largest gland.
Question 4 of 100
Normal human body temperature is approximately:
✅ Correct Answer: C
Exp: Normal human body temperature is approximately 37°C or 98.6°F.
Exp: Normal human body temperature is approximately 37°C or 98.6°F.
Question 5 of 100
Which blood group is known as the Universal Donor?
✅ Correct Answer: C
Exp: O negative (O-) blood can be transfused to almost any patient in need, making it the universal donor.
Exp: O negative (O-) blood can be transfused to almost any patient in need, making it the universal donor.
Question 6 of 100
Which blood group is known as the Universal Recipient?
✅ Correct Answer: B
Exp: Individuals with AB+ blood type can receive red blood cells from any blood type, making them universal recipients.
Exp: Individuals with AB+ blood type can receive red blood cells from any blood type, making them universal recipients.
Question 7 of 100
The average lifespan of a Red Blood Cell (RBC) is:
✅ Correct Answer: C
Exp: Red blood cells have a lifespan of approximately 120 days before they are removed by the spleen and liver.
Exp: Red blood cells have a lifespan of approximately 120 days before they are removed by the spleen and liver.
Question 8 of 100
Which gland is known as the "Master Gland" of the human body?
✅ Correct Answer: C
Exp: The pituitary gland is called the master gland because it controls the functions of many other endocrine glands.
Exp: The pituitary gland is called the master gland because it controls the functions of many other endocrine glands.
Question 9 of 100
The normal resting heart rate for an adult is:
✅ Correct Answer: B
Exp: A normal resting heart rate for adults ranges from 60 to 100 beats per minute.
Exp: A normal resting heart rate for adults ranges from 60 to 100 beats per minute.
Question 10 of 100
The fluid part of the blood is called:
✅ Correct Answer: C
Exp: Plasma is the clear, yellowish fluid part of the blood that carries cells, proteins, and waste products.
Exp: Plasma is the clear, yellowish fluid part of the blood that carries cells, proteins, and waste products.
Question 11 of 100
How many bones are there in an adult human body?
✅ Correct Answer: B
Exp: An adult human has 206 bones, while an infant is born with around 300 bones which fuse together as they grow.
Exp: An adult human has 206 bones, while an infant is born with around 300 bones which fuse together as they grow.
Question 12 of 100
Which organ acts as a blood filter in the human body?
✅ Correct Answer: C
Exp: Kidneys filter waste products, excess water, and other impurities from the blood to produce urine.
Exp: Kidneys filter waste products, excess water, and other impurities from the blood to produce urine.
Question 13 of 100
Digestion of food primarily begins in the:
✅ Correct Answer: C
Exp: Digestion begins in the mouth where chewing and saliva start breaking down carbohydrates.
Exp: Digestion begins in the mouth where chewing and saliva start breaking down carbohydrates.
Question 14 of 100
What is the primary function of White Blood Cells (WBCs)?
✅ Correct Answer: C
Exp: White blood cells are a key part of the immune system, helping the body fight off infections and diseases.
Exp: White blood cells are a key part of the immune system, helping the body fight off infections and diseases.
Question 15 of 100
The part of the eye used during an eye transplant is the:
✅ Correct Answer: B
Exp: The cornea is the clear front surface of the eye. It is the only part of the eye that can be transplanted.
Exp: The cornea is the clear front surface of the eye. It is the only part of the eye that can be transplanted.
Question 16 of 100
Which vitamin is produced by the human body when exposed to sunlight?
✅ Correct Answer: C
Exp: Vitamin D is synthesized in the skin when it is exposed to ultraviolet-B (UVB) rays from sunlight.
Exp: Vitamin D is synthesized in the skin when it is exposed to ultraviolet-B (UVB) rays from sunlight.
Question 17 of 100
Deficiency of Vitamin A causes:
✅ Correct Answer: C
Exp: Vitamin A deficiency leads to night blindness and other eye-related issues.
Exp: Vitamin A deficiency leads to night blindness and other eye-related issues.
Question 18 of 100
Scurvy is caused by the deficiency of:
✅ Correct Answer: B
Exp: Scurvy is caused by a severe lack of Vitamin C (ascorbic acid) in the diet, leading to bleeding gums and weakness.
Exp: Scurvy is caused by a severe lack of Vitamin C (ascorbic acid) in the diet, leading to bleeding gums and weakness.
Question 19 of 100
Which vitamin is essential for blood clotting?
✅ Correct Answer: C
Exp: Vitamin K is essential for the synthesis of proteins required for blood coagulation (clotting).
Exp: Vitamin K is essential for the synthesis of proteins required for blood coagulation (clotting).
Question 20 of 100
Rickets is a disease of the bones caused by the deficiency of:
✅ Correct Answer: D
Exp: Rickets causes soft, weak bones in children and is usually due to a lack of Vitamin D, calcium, or phosphate.
Exp: Rickets causes soft, weak bones in children and is usually due to a lack of Vitamin D, calcium, or phosphate.
Question 21 of 100
The disease "Goiter" is caused by the deficiency of:
✅ Correct Answer: C
Exp: Goiter is an enlargement of the thyroid gland, most commonly caused by a lack of iodine in the diet.
Exp: Goiter is an enlargement of the thyroid gland, most commonly caused by a lack of iodine in the diet.
Question 22 of 100
Anemia is a medical condition caused by the deficiency of:
✅ Correct Answer: B
Exp: Anemia is often caused by an iron deficiency, resulting in a lack of healthy red blood cells to carry adequate oxygen.
Exp: Anemia is often caused by an iron deficiency, resulting in a lack of healthy red blood cells to carry adequate oxygen.
Question 23 of 100
Malaria is transmitted by which type of mosquito?
✅ Correct Answer: C
Exp: Malaria is transmitted to humans through the bites of infected female Anopheles mosquitoes.
Exp: Malaria is transmitted to humans through the bites of infected female Anopheles mosquitoes.
Question 24 of 100
Dengue fever is transmitted by which mosquito?
✅ Correct Answer: B
Exp: Dengue is a viral infection transmitted primarily by the Aedes aegypti mosquito.
Exp: Dengue is a viral infection transmitted primarily by the Aedes aegypti mosquito.
Question 25 of 100
Hepatitis is a disease that primarily affects the:
✅ Correct Answer: C
Exp: Hepatitis refers to an inflammatory condition of the liver, often caused by viral infections.
Exp: Hepatitis refers to an inflammatory condition of the liver, often caused by viral infections.
Question 26 of 100
The speed of light in a vacuum is approximately:
✅ Correct Answer: A
Exp: The speed of light in a vacuum is exactly 299,792,458 meters per second, or about 300,000 km/s.
Exp: The speed of light in a vacuum is exactly 299,792,458 meters per second, or about 300,000 km/s.
Question 27 of 100
Sound waves cannot travel through:
✅ Correct Answer: D
Exp: Sound is a mechanical wave that requires a medium (solid, liquid, or gas) to travel. It cannot travel through a vacuum.
Exp: Sound is a mechanical wave that requires a medium (solid, liquid, or gas) to travel. It cannot travel through a vacuum.
Question 28 of 100
The SI unit of Force is:
✅ Correct Answer: C
Exp: The standard international (SI) unit of force is the Newton (N), named after Sir Isaac Newton.
Exp: The standard international (SI) unit of force is the Newton (N), named after Sir Isaac Newton.
Question 29 of 100
The SI unit of Work or Energy is:
✅ Correct Answer: B
Exp: The Joule (J) is the SI unit of energy and work.
Exp: The Joule (J) is the SI unit of energy and work.
Question 30 of 100
The instrument used to measure atmospheric pressure is:
✅ Correct Answer: B
Exp: A barometer is a scientific instrument used to measure atmospheric pressure.
Exp: A barometer is a scientific instrument used to measure atmospheric pressure.
Question 31 of 100
Anemometer is used to measure:
✅ Correct Answer: A
Exp: An anemometer is a device used for measuring wind speed and direction.
Exp: An anemometer is a device used for measuring wind speed and direction.
Question 32 of 100
Hygrometer is used to measure:
✅ Correct Answer: B
Exp: A hygrometer is an instrument used to measure the amount of humidity and water vapor in the atmosphere.
Exp: A hygrometer is an instrument used to measure the amount of humidity and water vapor in the atmosphere.
Question 33 of 100
Seismograph is an instrument used for:
✅ Correct Answer: B
Exp: A seismograph (or seismometer) measures and records details of earthquakes, such as force and duration.
Exp: A seismograph (or seismometer) measures and records details of earthquakes, such as force and duration.
Question 34 of 100
Lactometer is used to determine:
✅ Correct Answer: A
Exp: A lactometer is a small glass instrument used to test the purity and richness of milk based on its specific gravity.
Exp: A lactometer is a small glass instrument used to test the purity and richness of milk based on its specific gravity.
Question 35 of 100
Which instrument is used to measure electric current?
✅ Correct Answer: C
Exp: An ammeter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A).
Exp: An ammeter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A).
Question 36 of 100
The SI unit of Temperature is:
✅ Correct Answer: C
Exp: The Kelvin (K) is the base unit of temperature in the International System of Units (SI).
Exp: The Kelvin (K) is the base unit of temperature in the International System of Units (SI).
Question 37 of 100
Who discovered the law of gravity?
✅ Correct Answer: C
Exp: Sir Isaac Newton formulated the laws of motion and universal gravitation.
Exp: Sir Isaac Newton formulated the laws of motion and universal gravitation.
Question 38 of 100
The lightest particle of an atom is:
✅ Correct Answer: C
Exp: The electron is a subatomic particle with a negative elementary electric charge. It is the lightest stable subatomic particle.
Exp: The electron is a subatomic particle with a negative elementary electric charge. It is the lightest stable subatomic particle.
Question 39 of 100
The core of an atom is called the:
✅ Correct Answer: B
Exp: The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom.
Exp: The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom.
Question 40 of 100
Which gas is the most abundant in the Earth's atmosphere?
✅ Correct Answer: D
Exp: Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant gas.
Exp: Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant gas.
Question 41 of 100
What is the second most abundant gas in the Earth's atmosphere?
✅ Correct Answer: B
Exp: Oxygen makes up about 21% of the Earth's atmosphere.
Exp: Oxygen makes up about 21% of the Earth's atmosphere.
Question 42 of 100
Which is the most abundant element in the universe?
✅ Correct Answer: C
Exp: Hydrogen is the most abundant element in the universe, making up about 75% of its normal matter.
Exp: Hydrogen is the most abundant element in the universe, making up about 75% of its normal matter.
Question 43 of 100
The most abundant metal in the Earth's crust is:
✅ Correct Answer: C
Exp: Aluminum is the most abundant metal, and the third most abundant element overall in the Earth's crust.
Exp: Aluminum is the most abundant metal, and the third most abundant element overall in the Earth's crust.
Question 44 of 100
The chemical formula for heavy water is:
✅ Correct Answer: B
Exp: Heavy water is deuterium oxide (D2O), a form of water containing a larger than normal amount of the hydrogen isotope deuterium.
Exp: Heavy water is deuterium oxide (D2O), a form of water containing a larger than normal amount of the hydrogen isotope deuterium.
Question 45 of 100
The chemical name of common salt is:
✅ Correct Answer: C
Exp: Common table salt is Sodium Chloride, with the chemical formula NaCl.
Exp: Common table salt is Sodium Chloride, with the chemical formula NaCl.
Question 46 of 100
Which gas is commonly known as Laughing Gas?
✅ Correct Answer: A
Exp: Nitrous oxide (N2O) is a colorless gas commonly known as laughing gas, used for its anesthetic and pain-reducing effects.
Exp: Nitrous oxide (N2O) is a colorless gas commonly known as laughing gas, used for its anesthetic and pain-reducing effects.
Question 47 of 100
Dry ice is the solid form of:
✅ Correct Answer: C
Exp: Dry ice is solid carbon dioxide (CO2). It is primarily used as a cooling agent.
Exp: Dry ice is solid carbon dioxide (CO2). It is primarily used as a cooling agent.
Question 48 of 100
Which gas is commonly used in electric bulbs?
✅ Correct Answer: C
Exp: Argon is an inert gas used in incandescent light bulbs to prevent the rapid oxidation of the tungsten filament.
Exp: Argon is an inert gas used in incandescent light bulbs to prevent the rapid oxidation of the tungsten filament.
Question 49 of 100
The lightest gas is:
✅ Correct Answer: B
Exp: Hydrogen is the lightest and simplest element, consisting of one proton and one electron.
Exp: Hydrogen is the lightest and simplest element, consisting of one proton and one electron.
Question 50 of 100
Which noble gas is commonly used in balloons?
✅ Correct Answer: C
Exp: Helium is the second lightest element and is non-flammable, making it safe and ideal for filling balloons.
Exp: Helium is the second lightest element and is non-flammable, making it safe and ideal for filling balloons.
Question 51 of 100
Diamond and graphite are allotropes of which element?
✅ Correct Answer: C
Exp: Both diamond and graphite are composed purely of carbon atoms, but they are arranged in different physical structures (allotropes).
Exp: Both diamond and graphite are composed purely of carbon atoms, but they are arranged in different physical structures (allotropes).
Question 52 of 100
The hardest natural substance found on Earth is:
✅ Correct Answer: C
Exp: Diamond is the hardest naturally occurring substance on Earth, scoring a 10 on the Mohs scale of hardness.
Exp: Diamond is the hardest naturally occurring substance on Earth, scoring a 10 on the Mohs scale of hardness.
Question 53 of 100
The purest form of iron is:
✅ Correct Answer: B
Exp: Wrought iron is the purest commercial form of iron, containing very little carbon (less than 0.08%).
Exp: Wrought iron is the purest commercial form of iron, containing very little carbon (less than 0.08%).
Question 54 of 100
Which acid is present in lemons and oranges?
✅ Correct Answer: C
Exp: Citrus fruits like lemons and oranges contain citric acid, which gives them their sour taste.
Exp: Citrus fruits like lemons and oranges contain citric acid, which gives them their sour taste.
Question 55 of 100
Which acid is used in car batteries?
✅ Correct Answer: C
Exp: Sulfuric acid (H2SO4) is mixed with water to form the electrolyte in lead-acid car batteries.
Exp: Sulfuric acid (H2SO4) is mixed with water to form the electrolyte in lead-acid car batteries.
Question 56 of 100
Which acid is naturally produced in the human stomach for digestion?
✅ Correct Answer: B
Exp: Hydrochloric acid (HCl) is a component of gastric acid in the digestive systems of most animal species, including humans.
Exp: Hydrochloric acid (HCl) is a component of gastric acid in the digestive systems of most animal species, including humans.
Question 57 of 100
The pH of pure water is:
✅ Correct Answer: C
Exp: Pure water is neutral and has a pH of exactly 7 at room temperature.
Exp: Pure water is neutral and has a pH of exactly 7 at room temperature.
Question 58 of 100
Which is the nearest planet to the Sun?
✅ Correct Answer: D
Exp: Mercury is the smallest and innermost planet in the Solar System.
Exp: Mercury is the smallest and innermost planet in the Solar System.
Question 59 of 100
Which is the hottest planet in our solar system?
✅ Correct Answer: B
Exp: Despite Mercury being closer, Venus is the hottest planet because its thick atmosphere traps heat in a runaway greenhouse effect.
Exp: Despite Mercury being closer, Venus is the hottest planet because its thick atmosphere traps heat in a runaway greenhouse effect.
Question 60 of 100
The largest planet in our solar system is:
✅ Correct Answer: D
Exp: Jupiter is the largest planet, with a mass more than two and a half times that of all the other planets in the Solar System combined.
Exp: Jupiter is the largest planet, with a mass more than two and a half times that of all the other planets in the Solar System combined.
Question 61 of 100
Which planet is known as the "Red Planet"?
✅ Correct Answer: B
Exp: Mars is called the Red Planet because iron oxide (rust) prevalent on its surface gives it a reddish appearance.
Exp: Mars is called the Red Planet because iron oxide (rust) prevalent on its surface gives it a reddish appearance.
Question 62 of 100
The nearest star to the Earth is:
✅ Correct Answer: D
Exp: The Sun is a star and is the closest one to Earth.
Exp: The Sun is a star and is the closest one to Earth.
Question 63 of 100
The nearest star to our solar system is:
✅ Correct Answer: B
Exp: Proxima Centauri is the closest star to the Sun and our solar system, located about 4.24 light-years away.
Exp: Proxima Centauri is the closest star to the Sun and our solar system, located about 4.24 light-years away.
Question 64 of 100
Our solar system is located in which galaxy?
✅ Correct Answer: C
Exp: The Milky Way is the galaxy that contains our Solar System, with the name describing the galaxy's appearance from Earth.
Exp: The Milky Way is the galaxy that contains our Solar System, with the name describing the galaxy's appearance from Earth.
Question 65 of 100
The scientific study of the universe is known as:
✅ Correct Answer: B
Exp: Cosmology is a branch of astronomy that involves the origin and evolution of the universe.
Exp: Cosmology is a branch of astronomy that involves the origin and evolution of the universe.
Question 66 of 100
The estimated age of the Earth is approximately:
✅ Correct Answer: C
Exp: Radiometric dating indicates that Earth is about 4.54 billion years old.
Exp: Radiometric dating indicates that Earth is about 4.54 billion years old.
Question 67 of 100
The lowest layer of the Earth's atmosphere is the:
✅ Correct Answer: D
Exp: The troposphere is the lowest layer of Earth's atmosphere, where all weather takes place.
Exp: The troposphere is the lowest layer of Earth's atmosphere, where all weather takes place.
Question 68 of 100
The ozone layer is primarily located in which layer of the atmosphere?
✅ Correct Answer: B
Exp: The ozone layer sits in the lower region of the stratosphere and absorbs most of the Sun's ultraviolet (UV) radiation.
Exp: The ozone layer sits in the lower region of the stratosphere and absorbs most of the Sun's ultraviolet (UV) radiation.
Question 69 of 100
Tsunamis are large ocean waves primarily caused by:
✅ Correct Answer: C
Exp: A tsunami is a series of waves in a water body caused by the displacement of a large volume of water, typically due to underwater earthquakes.
Exp: A tsunami is a series of waves in a water body caused by the displacement of a large volume of water, typically due to underwater earthquakes.
Question 70 of 100
The instrument used for viewing distant objects in space is the:
✅ Correct Answer: C
Exp: A telescope is an optical instrument designed to make distant objects appear nearer.
Exp: A telescope is an optical instrument designed to make distant objects appear nearer.
Question 71 of 100
The scientific study of weather is called:
✅ Correct Answer: B
Exp: Meteorology is the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting.
Exp: Meteorology is the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting.
Question 72 of 100
A "Light Year" is a unit of:
✅ Correct Answer: B
Exp: A light-year is a unit of length used to express astronomical distances. It is the distance that light travels in a vacuum in one Earth year.
Exp: A light-year is a unit of length used to express astronomical distances. It is the distance that light travels in a vacuum in one Earth year.
Question 73 of 100
The blue color of the clear sky is due to:
✅ Correct Answer: D
Exp: Rayleigh scattering is responsible for the blue color of the sky, as shorter (blue) wavelengths of sunlight are scattered more efficiently than longer wavelengths.
Exp: Rayleigh scattering is responsible for the blue color of the sky, as shorter (blue) wavelengths of sunlight are scattered more efficiently than longer wavelengths.
Question 74 of 100
Who was the first person to step on the Moon?
✅ Correct Answer: C
Exp: Neil Armstrong, an American astronaut, became the first person to walk on the Moon on July 20, 1969.
Exp: Neil Armstrong, an American astronaut, became the first person to walk on the Moon on July 20, 1969.
Question 75 of 100
The energy of the sun is generated mainly by:
✅ Correct Answer: B
Exp: The Sun generates energy through nuclear fusion of hydrogen nuclei into helium in its core.
Exp: The Sun generates energy through nuclear fusion of hydrogen nuclei into helium in its core.
Question 76 of 100
Which process describes how plants make their own food?
✅ Correct Answer: C
Exp: Photosynthesis is the process by which green plants use sunlight to synthesize nutrients from carbon dioxide and water.
Exp: Photosynthesis is the process by which green plants use sunlight to synthesize nutrients from carbon dioxide and water.
Question 77 of 100
The chemical symbol for Gold is:
✅ Correct Answer: B
Exp: The symbol for gold is Au, derived from the Latin word "aurum".
Exp: The symbol for gold is Au, derived from the Latin word "aurum".
Question 78 of 100
What is the primary gas found in natural gas?
✅ Correct Answer: D
Exp: Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane (CH4).
Exp: Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane (CH4).
Question 79 of 100
Which of the following is not a primary color of light?
✅ Correct Answer: D
Exp: The primary colors of light (RGB color model) are red, green, and blue. Yellow is a primary color in art/pigments but not in light.
Exp: The primary colors of light (RGB color model) are red, green, and blue. Yellow is a primary color in art/pigments but not in light.
Question 80 of 100
The device used to convert alternating current (AC) to direct current (DC) is called a:
✅ Correct Answer: B
Exp: A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.
Exp: A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.
Question 81 of 100
Which planet has the most prominent ring system?
✅ Correct Answer: C
Exp: Saturn is famous for its extensive and bright ring system composed mostly of ice particles, rocky debris, and dust.
Exp: Saturn is famous for its extensive and bright ring system composed mostly of ice particles, rocky debris, and dust.
Question 82 of 100
The green pigment in plants responsible for photosynthesis is:
✅ Correct Answer: D
Exp: Chlorophyll is the green pigment found in the chloroplasts of plants that absorbs light energy for photosynthesis.
Exp: Chlorophyll is the green pigment found in the chloroplasts of plants that absorbs light energy for photosynthesis.
Question 83 of 100
The smallest unit of an element that retains its chemical properties is:
✅ Correct Answer: C
Exp: An atom is the smallest unit of ordinary matter that forms a chemical element.
Exp: An atom is the smallest unit of ordinary matter that forms a chemical element.
Question 84 of 100
What is the normal pH of human blood?
✅ Correct Answer: C
Exp: Human blood is slightly basic (alkaline) with a normal pH range of 7.35 to 7.45.
Exp: Human blood is slightly basic (alkaline) with a normal pH range of 7.35 to 7.45.
Question 85 of 100
The layer of the Earth immediately below the crust is called the:
✅ Correct Answer: C
Exp: The mantle is a layer inside a planetary body bounded below by a core and above by a crust.
Exp: The mantle is a layer inside a planetary body bounded below by a core and above by a crust.
Question 86 of 100
Which subatomic particle has no electric charge?
✅ Correct Answer: C
Exp: A neutron is a subatomic particle with no net electric charge, found in the nucleus of an atom.
Exp: A neutron is a subatomic particle with no net electric charge, found in the nucleus of an atom.
Question 87 of 100
The process by which water vapor turns into liquid water is called:
✅ Correct Answer: B
Exp: Condensation is the change of the physical state of matter from the gas phase into the liquid phase.
Exp: Condensation is the change of the physical state of matter from the gas phase into the liquid phase.
Question 88 of 100
What is the main component of bones and teeth?
✅ Correct Answer: B
Exp: Calcium phosphate is the principal form of calcium found in bovine milk and blood, making up the mineral part of bones and teeth.
Exp: Calcium phosphate is the principal form of calcium found in bovine milk and blood, making up the mineral part of bones and teeth.
Question 89 of 100
Who developed the theory of relativity?
✅ Correct Answer: C
Exp: Albert Einstein developed the theory of relativity, one of the two pillars of modern physics.
Exp: Albert Einstein developed the theory of relativity, one of the two pillars of modern physics.
Question 90 of 100
Which blood vessels carry blood away from the heart?
✅ Correct Answer: B
Exp: Arteries are blood vessels that carry oxygen-rich blood away from the heart to the body.
Exp: Arteries are blood vessels that carry oxygen-rich blood away from the heart to the body.
Question 91 of 100
Sound travels fastest in:
✅ Correct Answer: D
Exp: Sound waves travel fastest through solids because the molecules are packed closely together.
Exp: Sound waves travel fastest through solids because the molecules are packed closely together.
Question 92 of 100
The SI unit of electric resistance is:
✅ Correct Answer: C
Exp: The ohm (symbol: Ω) is the SI derived unit of electrical resistance.
Exp: The ohm (symbol: Ω) is the SI derived unit of electrical resistance.
Question 93 of 100
Which organ produces bile?
✅ Correct Answer: D
Exp: Bile is a fluid produced by the liver that aids the digestion of lipids in the small intestine. The gallbladder stores it.
Exp: Bile is a fluid produced by the liver that aids the digestion of lipids in the small intestine. The gallbladder stores it.
Question 94 of 100
The process of splitting a heavy atomic nucleus into smaller nuclei is called:
✅ Correct Answer: B
Exp: Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei, releasing a large amount of energy.
Exp: Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei, releasing a large amount of energy.
Question 95 of 100
What is the chemical symbol for Iron?
✅ Correct Answer: B
Exp: The chemical symbol for iron is Fe, from the Latin word "ferrum".
Exp: The chemical symbol for iron is Fe, from the Latin word "ferrum".
Question 96 of 100
Which part of the brain controls balance and coordination?
✅ Correct Answer: B
Exp: The cerebellum is the part of the brain at the back of the skull in vertebrates, functioning to coordinate and regulate muscular activity.
Exp: The cerebellum is the part of the brain at the back of the skull in vertebrates, functioning to coordinate and regulate muscular activity.
Question 97 of 100
The greenhouse effect is primarily caused by an increase in which gas?
✅ Correct Answer: C
Exp: Carbon dioxide is the primary greenhouse gas emitted through human activities, causing the greenhouse effect and global warming.
Exp: Carbon dioxide is the primary greenhouse gas emitted through human activities, causing the greenhouse effect and global warming.
Question 98 of 100
Which of the following is a non-renewable source of energy?
✅ Correct Answer: D
Exp: Coal is a fossil fuel and a non-renewable energy source because it takes millions of years to form.
Exp: Coal is a fossil fuel and a non-renewable energy source because it takes millions of years to form.
Question 99 of 100
What instrument is used to measure the intensity of light?
✅ Correct Answer: A
Exp: A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared, including visible light.
Exp: A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared, including visible light.
Question 100 of 100
The basic structural and functional unit of all living organisms is the:
✅ Correct Answer: C
Exp: The cell is the basic structural, functional, and biological unit of all known organisms. It is the smallest unit of life.
Exp: The cell is the basic structural, functional, and biological unit of all known organisms. It is the smallest unit of life.
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