Here are 50 general science multiple-choice questions (MCQs) along with their answers:
What is the chemical symbol for water?
a) O2
b) H2O ✅
c) CO2
d) N2
Which gas is most abundant in Earth’s atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen ✅
d) Argon
What is the unit of electric current?
a) Volt
b) Ampere ✅
c) Watt
d) Ohm
Which scientist is credited with discovering the laws of motion?
a) Albert Einstein
b) Isaac Newton ✅
c) Galileo Galilei
d) Nikola Tesla
What is the chemical symbol for gold?
a) Au ✅
b) Ag
c) Fe
d) Cu
Which planet is known as the “Red Planet”?
a) Jupiter
b) Mars ✅
c) Venus
d) Saturn
The process of a liquid turning into a gas at the surface is called:
a) Condensation
b) Sublimation
c) Evaporation ✅
d) Freezing
What is the hardest natural substance on Earth?
a) Diamond ✅
b) Quartz
c) Ruby
d) Topaz
What is the chemical symbol for iron?
a) I
b) Ir
c) Fe ✅
d) In
The process by which plants make their own food using sunlight is called:
a) Respiration
b) Photosynthesis ✅
c) Fermentation
d) Transpiration
Which type of electromagnetic radiation has the shortest wavelength?
a) Radio waves
b) Microwaves
c) X-rays
d) Gamma rays ✅
What is the chemical formula for table salt?
a) NaCl ✅
b) H2O
c) CO2
d) CaCO3
Which gas is released during photosynthesis?
a) Carbon dioxide
b) Oxygen ✅
c) Nitrogen
d) Hydrogen
What is the SI unit of force?
a) Joule
b) Watt
c) Newton ✅
d) Kilogram
What is the name of the brightest star in the night sky?
a) Proxima Centauri
b) Sirius ✅
c) Betelgeuse
d) Polaris
The process of converting a solid directly into a gas without passing through the liquid state is called:
a) Condensation
b) Sublimation ✅
c) Evaporation
d) Freezing
Which metal is the best conductor of electricity?
a) Copper
b) Aluminum
c) Silver ✅
d) Gold
What is the chemical symbol for helium?
a) H
b) He ✅
c) Hy
d) Ha
The process of splitting an atomic nucleus into smaller nuclei is called:
a) Fission ✅
b) Fusion
c) Condensation
d) Evaporation
What is the chemical symbol for carbon dioxide?
a) CO2 ✅
b) O2
c) CO
d) C2O
Which gas is responsible for the greenhouse effect on Earth?
a) Oxygen
b) Nitrogen
c) Carbon dioxide ✅
d) Argon
What is the chemical symbol for silver?
a) Ag ✅
b) Au
c) Si
d) Sr
The process of a gas turning into a liquid is called:
a) Sublimation
b) Evaporation
c) Freezing
d) Condensation ✅
What is the unit of frequency?
a) Hertz ✅
b) Watt
c) Ampere
d) Ohm
Which gas is essential for respiration in animals?
a) Oxygen ✅
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
What is the chemical symbol for potassium?
a) K ✅
b) Pt
c) P
d) Kr
The force that opposes the motion of objects through air or other fluids is called:
a) Friction ✅
b) Gravity
c) Inertia
d) Momentum
What is the name of the first human to walk on the moon?
a) Neil Armstrong ✅
b) Buzz Aldrin
c) Yuri Gagarin
d) John Glenn
What is the chemical symbol for sodium?
a) S
b) Se
c) So
d) Na ✅
The process of changing a liquid into a solid is called:
a) Sublimation
b) Evaporation
c) Freezing ✅
d) Condensation
Which planet is known as the “Morning Star” or “Evening Star”?
a) Mars
b) Venus ✅
c) Mercury
d) Jupiter
What is the chemical symbol for nitrogen?
a) N ✅
b) Ni
c) Ne
d) Na
The process of converting a gas directly into a solid without passing through the liquid state is called:
a) Condensation
b) Sublimation ✅
c) Evaporation
d) FreezingWhat is the unit of electric voltage?
a) Ampere
b) Watt
c) Volt ✅
d) Ohm
Which gas is used by plants during photosynthesis?
a) Oxygen
b) Nitrogen
c) Carbon dioxide ✅
d) Hydrogen
What is the chemical symbol for lead?
a) L
b) Le
c) Li
d) Pb ✅
The process of converting a solid directly into a gas without passing through the liquid state is called:
a) Condensation
b) Sublimation ✅
c) Evaporation
d) Freezing
What is the name of the largest ocean on Earth?
a) Pacific Ocean ✅
b) Atlantic Ocean
c) Indian Ocean
d) Arctic Ocean
Which gas is known as laughing gas?
a) Oxygen
b) Nitrous oxide ✅
c) Carbon dioxide
d) Nitrogen
What is the chemical symbol for copper?
a) Cu ✅
b) Co
c) Cr
d) Cp
The force that pulls objects towards the center of the Earth is called:
a) Friction
b) Gravity ✅
c) Inertia
d) Momentum
The process of a liquid turning into a gas at the surface is called:
a) Condensation
b) Sublimation
c) Evaporation ✅
d) Freezing
Which gas is most abundant in Earth’s atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen ✅
d) Argon
What is the unit of electric current?
a) Volt
b) Ampere ✅
c) Watt
d) Ohm
Which scientist is credited with discovering the laws of motion?
a) Albert Einstein
b) Isaac Newton ✅
c) Galileo Galilei
d) Nikola Tesla
What is the chemical symbol for gold?
a) Au ✅
b) Ag
c) Fe
d) Cu
Which planet is known as the “Red Planet”?
a) Jupiter
b) Mars ✅
c) Venus
d) Saturn
What is the hardest natural substance on Earth?
a) Diamond ✅
b) Quartz
c) Ruby
d) Topaz
What is the name of the brightest star in the night sky?
a) Proxima Centauri
b) Sirius ✅
c) Betelgeuse
d) Polaris
Which type of electromagnetic radiation has the shortest wavelength?
a) Radio waves
b) Microwaves
c) X-rays
d) Gamma rays ✅
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