Year 8 Science Exam Revision

The widest layer of the Earth is the

• Crust

• Mantle

• Outer core

• Inner core

Metamorphic rock forms from

• heat and high pressure applied to rock

• rock being broken down into smaller particles which cement together

• rock melting to magma and then cooling

• rock changing due to cool temperatures and low pressure

NaOH is an example of:

• an element

• a compound

• an atom

• a pure substance

If a potassium atom has 19 protons, which statement below is also true:

• Potassium has 19 neutrons

• Potassium has 19 electrons

• Potassium has a mass number of 38

• Potassium has an atomic number of 10

An apple being held above the ground contains which type of energy?

• Kinetic

• Elastic potential

• Gravitational potential

• Nuclear energy

Static electricity involves

• flow of electrons through a circuit

• flow of atoms through a circuit

• objects losing or gaining electrons

• objects losing or gaining atoms

Identify the correct unit of measurement for a) current b) voltage

• a) volts b) amps

• a) ohms b) volts

• a) amps b) volts

• a) amps b) ohms

Ashlea identifies a cell as being a plant cell. She labels her diagram. Which of the following would identify only a plant cell?

• Ribosomes

• Nucleus

• Mitochondria

• Chloroplasts

A muscle cell produces a lot of energy for an organism. Which organelle would be present?

• Many nuclei

• Many mitochondria

• Many ribosomes

• Many vacuoles

Which of the following is NOT a characteristic of an artery?

• Generally carries oxygenated blood

• Has thick walls

• Carries blood away from the heart

• Contains valves to prevent back flow of blood