Basic science mock exam questions and answers for Jss3

Basic science mock exam questions and answers for Jss3

Here are 20 basic science questions suitable for a Junior Secondary School (JSS3) mock exam, along with multiple-choice options and answers:

Which planet is known as the "Red Planet"?

a) Venus

b) Mars

c) Jupiter

d) Saturn

Answer: b) Mars

What is the chemical symbol for water?

a) H2O

b) CO2

c) O2

d) NaCl

Answer: a) H2O

What is the smallest particle of an element that retains its properties?

a) Atom

b) Molecule

c) Electron

d) Proton

Answer: a) Atom

Which gas do plants absorb from the atmosphere during photosynthesis?

a) Oxygen

b) Nitrogen

c) Carbon dioxide

d) Hydrogen

Answer: c) Carbon dioxide

Which organ in the human body produces insulin?

a) Liver

b) Stomach

c) Pancreas

d) Kidney

Answer: c) Pancreas

What is the chemical symbol for gold?

a) Au

b) Ag

c) Fe

d) Cu

Answer: a) Au

What is the process of a liquid changing into a gas at its boiling point?

a) Evaporation

b) Sublimation

c) Condensation

d) Vaporization

Answer: d) Vaporization

Which gas makes up the majority of Earth's atmosphere?

a) Oxygen

b) Carbon dioxide

c) Nitrogen

d) Hydrogen

Answer: c) Nitrogen

What is the SI unit of electric current?

a) Volt

b) Ohm

c) Ampere

d) Watt

Answer: c) Ampere

What is the chemical formula of common table salt?

a) NaOH

b) Na2CO3

c) NaCl

d) Na2SO4

Answer: c) NaCl

Which planet is known as the "Morning Star" and "Evening Star"?

a) Mercury

b) Venus

c) Earth

d) Mars

Answer: b) Venus

What is the chemical symbol for iron?

a) Fe

b) Ir

c) In

d) Ni

Answer: a) Fe

What is the process of a solid changing directly into a gas without becoming a liquid?

a) Sublimation

b) Evaporation

c) Condensation

d) Melting

Answer: a) Sublimation

Which gas do humans primarily exhale when they breathe out?

a) Oxygen

b) Carbon dioxide

c) Nitrogen

d) Hydrogen

Answer: b) Carbon dioxide

What is the largest planet in our solar system?

a) Earth

b) Mars

c) Jupiter

d) Saturn

Answer: c) Jupiter

What is the primary source of energy for most living organisms on Earth?

a) Water

b) Sunlight

c) Wind

d) Geothermal energy

Answer: b) Sunlight

What is the chemical symbol for silver?

a) Si

b) Sr

c) Ag

d) Sn

Answer: c) Ag

Which gas is responsible for the blue color of the Earth's sky?

a) Oxygen

b) Nitrogen

c) Carbon dioxide

d) Ozone

Answer: b) Nitrogen

What is the unit of force in the International System of Units (SI)?

a) Joule

b) Newton

c) Watt

d) Volt

Answer: b) Newton

Which layer of the Earth's atmosphere is closest to the Earth's surface?

a) Troposphere

b) Stratosphere

c) Mesosphere

d) Exosphere

Answer: a) Troposphere