🔬 100 Science One-Liners Facts
| Competitive Exam Level
PHYSICS (1–25)
-
The speed of light in vacuum is —
3 × 10⁸ m/s -
The SI unit of force is —
Newton -
The SI unit of power is —
Watt -
Which mirror is commonly used in vehicles?
Convex mirror -
The instrument used to measure temperature is —
Thermometer -
The unit of electric current is —
Ampere -
The “Father of Physics” is —
Albert Einstein -
The force that pulls objects toward the Earth is called —
Gravity -
The SI unit of energy is —
Joule -
A magnifying glass uses a —
Convex lens -
Sound cannot travel through —
Vacuum -
The colour with the highest wavelength is —
Red -
The colour with the shortest wavelength is —
Violet -
The unit of frequency is —
Hertz -
The speed of sound is maximum in —
Solids -
The process in which a solid changes directly into gas is called —
Sublimation -
The freezing point of water is —
0°C -
The boiling point of water is —
100°C -
Which device converts mechanical energy into electrical energy?
Generator -
1 kilowatt is equal to —
1000 watts -
A moving car possesses —
Kinetic energy -
The centre of gravity of a body is the point where —
Its weight appears to be concentrated -
Which mirror is used in torches?
Concave mirror -
A rainbow is formed due to the phenomenon of —
Dispersion of light -
Energy stored in a stretched spring is called —
Potential energy
CHEMISTRY (26–50)
-
The atomic number of hydrogen is —
1 -
The chemical formula of water is —
H₂O -
The chemical formula of carbon dioxide is —
CO₂ -
The pH value of a neutral solution is —
7 -
The gas absorbed by plants during photosynthesis is —
Carbon dioxide -
The gas released during photosynthesis is —
Oxygen -
Acids generally taste —
Sour -
Bases generally taste —
Bitter -
The hardest naturally occurring substance is —
Diamond -
Noble gases belong to group —
18 -
Rusting mainly occurs on —
Iron -
Rusting requires the presence of —
Air and moisture -
The chemical symbol of gold is —
Au -
The chemical symbol of sodium is —
Na -
The chemical used to purify drinking water is —
Chlorine -
LPG mainly contains —
Butane -
The chemical formula of bleaching powder is —
CaOCl₂ -
The gas commonly used in balloons is —
Helium -
Milk is an example of a —
Colloid -
The element essential for haemoglobin formation is —
Iron -
The atomic number of oxygen is —
8 -
Vinegar contains —
Acetic acid -
The metal that is liquid at room temperature is —
Mercury -
Bronze is an alloy of —
Copper and tin -
Salt is separated from seawater by the process of —
Evaporation
BIOLOGY (51–75)
-
The basic unit of life is the —
Cell -
The powerhouse of the cell is —
Mitochondria -
The genetic material in humans is —
DNA -
The largest organ in the human body is —
Skin -
The total number of bones in an adult human is —
206 -
Plants prepare their food through the process of —
Photosynthesis -
The green pigment in plants is —
Chlorophyll -
The organ that pumps blood throughout the body is —
Heart -
The normal resting heart rate of an adult is —
72 beats per minute -
The organ that controls body activities is —
Brain -
The blood cells that fight infection are —
White blood cells -
The blood cells that carry oxygen are —
Red blood cells -
Deficiency of iron causes —
Anaemia -
Deficiency of Vitamin D leads to —
Rickets -
Deficiency of Vitamin C causes —
Scurvy -
Deficiency of Vitamin A results in —
Night blindness -
The largest mammal is the —
Blue whale -
The smallest bone in the human body is —
Stapes -
A plant that traps insects is —
Venus flytrap -
The reproductive part of a plant is the —
Flower -
The universal donor blood group is —
O negative -
The universal recipient blood group is —
AB positive -
The organ that filters waste from blood is —
Kidneys -
The hormone insulin is produced by the —
Pancreas -
A disease caused by a virus is —
Influenza (flu)
EARTH & SPACE SCIENCE (76–100)
-
The planet known as the Red Planet is —
Mars -
The hottest planet in the solar system is —
Venus -
The largest planet in the solar system is —
Jupiter -
The smallest planet is —
Mercury -
The planet known as the Blue Planet is —
Earth -
Earth revolves around the —
Sun -
Earth completes one rotation in —
24 hours -
Earth completes one revolution around the sun in —
365 days -
The Moon is the natural satellite of —
Earth -
The galaxy in which we live is the —
Milky Way -
The shape of the Earth is an —
Oblate spheroid -
Earthquakes occur mainly in the —
Crust -
The hottest layer of the atmosphere is the —
Thermosphere -
The gas that protects Earth from harmful UV rays is —
Ozone -
Oxygen makes up about —
21% of the atmosphere -
The water cycle includes —
Evaporation, condensation, and precipitation -
Earthquakes are measured using a —
Seismograph -
The nearest star to Earth is the —
Sun -
The number of planets in the solar system is —
8 -
The planet famous for its rings is —
Saturn -
Distance in space is measured in —
Light years -
The force that keeps planets in their orbits is —
Gravity -
The path followed by a planet around the sun is called its —
Orbit -
Earth’s natural satellite is the —
Moon -
The only known planet that supports life is —
Earth