Year 8 Science Quiz Revision

Which of the following is a chemical reaction?

• Melting ice

• Burning wood

• Dissolving sugar in water

• Breaking a glass

What is the main difference between a physical change and a chemical change?

• Physical change is often reversible, chemical change is not

• Chemical change involves a change in state, physical change does not

• Physical change creates new substances, chemical change does not

• Chemical change is often reversible, physical change is not

Which organ is primarily responsible for gas exchange in the respiratory system?

• Heart

• Lungs

• Liver

• Kidneys

What is the main function of the digestive system?

• To circulate blood throughout the body

• To break down food and absorb nutrients

• To filter waste from the blood

• To exchange gases with the environment

Which component of the circulatory system is responsible for transporting oxygen?

• White blood cells

• Platelets

• Red blood cells

• Plasma

What is the smallest unit of matter?

• Molecule

• Atom

• Compound

• Cell

Which of the following is an example of energy transformation?

• A car engine converting petrol into motion

• A book falling off a shelf

• Water freezing into ice

• A balloon popping

Which element is represented by the symbol 'O' on the periodic table?

• Oxygen

• Gold

• Osmium

• Hydrogen

Which of the following is a characteristic of plant cells but not animal cells?

• Nucleus

• Cell wall

• Mitochondria

• Cell membrane

What is the purpose of using a microscope in science?

• To measure temperature

• To observe small objects or organisms

• To weigh substances

• To mix chemicals