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BECE (Ghana) Science — practice by topic

Browse 59 questions across 19 Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Science topics

Visible Light (7)Electric Circuits (6)Chemical Reactions and Equations (5)The Solar System (5)Atoms and Elements (4)Changes of State (3)Ecosystems (3)Microorganisms (3)Particle Model of Matter (3)Photosynthesis (3)Static Electricity (3)Compounds and Molecules (2)Density and Mass (2)Gas Pressure (2)Respiration (2)Stars and Galaxies (2)Telescopes (2)Magnetism (1)Mixtures and Pure Substances (1)

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Most forms of matter are built from very many tiny particles. What are these particles called?Read the answer and worked solution →Which particle inside an atom carries no electric charge at all?Read the answer and worked solution →How do electrons compare in size with protons and neutrons?Read the answer and worked solution →A material is made up of atoms of only one kind. What is that material?Read the answer and worked solution →

Worked practice questions

Most forms of matter are built from very many tiny particles. What are these particles called?

  1. Atoms
  2. Fibres
  3. Grains
  4. Fluids
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Correct answer: A. Atoms

1. A brick wall is built from very many identical bricks stacked together. 2. Matter works in the same way, because it is made of very many small particles. 3. Those small particles are called atoms, and they are far too small to see. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), The building blocks of matter_

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Which particle inside an atom carries no electric charge at all?

  1. The proton
  2. The neutron
  3. The electron
  4. The nucleus
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Correct answer: B. The neutron

1. An atom holds three kinds of smaller particle: protons, neutrons and electrons. 2. Protons carry a positive charge and electrons carry a negative charge. 3. Neutrons are neither positive nor negative, so they are described as neutral. 4. The nucleus is a place inside the atom, not a particle on its own. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Neutrons_

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How do electrons compare in size with protons and neutrons?

  1. They are far heavier
  2. They are far fewer
  3. They are far smaller
  4. They are far slower
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Correct answer: C. They are far smaller

1. Protons and neutrons sit packed together in the nucleus at the centre. 2. Electrons move in a wide zone around that nucleus at very high speed. 3. Electrons are about 2000 times smaller than protons and neutrons. 4. They are also lighter, not heavier, so the option about weight is wrong. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Electrons_

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