Science Quiz

What is the primary function of neutrons in an atom?

• Generate electrical charge

• Contribute to atomic mass

• Create ionic bonds

• Conduct heat

Answer explanation

Neutrons contribute to atomic mass by adding to the nucleus without affecting the charge, helping stabilize the atom.

Which of the following is a chemical change?

• Boiling water

• Dissolving sugar in water

• Rusting of iron

• Melting ice

Answer explanation

The correct choice is 'Rusting of iron' because it involves a chemical reaction where iron reacts with oxygen to form iron oxide, indicating a chemical change.

What happens to the particles of a substance as its temperature increases?

• They move more slowly

• They move more quickly

• They decrease in size

• They bond more tightly

Answer explanation

As the temperature of a substance increases, the particles move more quickly due to the increase in kinetic energy.

Which organ system is primarily responsible for transporting nutrients, oxygen, and wastes to and from cells?

• Digestive system

• Circulatory system

• Nervous system

• Excretory system

Answer explanation

The circulatory system is primarily responsible for transporting nutrients, oxygen, and wastes to and from cells.

What is the process by which plants make their food using sunlight?

• Respiration

• Photosynthesis

• Digestion

• Fermentation

Answer explanation

Plants make their food using sunlight through the process of Photosynthesis.

Which type of reproduction involves two parents and produces offspring that are genetically different from each other?

• Asexual reproduction

• Sexual reproduction

• Binary fission

• Mitosis

Answer explanation

Sexual reproduction involves two parents and produces genetically different offspring.

What layer of the Earth is made mostly of iron and nickel?

• Crust

• Mantle

• Core

• Lithosphere

Answer explanation

The layer of the Earth made mostly of iron and nickel is the Core.

Which is the main gas found in the atmosphere of Mars?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Answer explanation

The main gas found in the atmosphere of Mars is carbon dioxide.

What type of rock is formed by the cooling of magma or lava?

• Sedimentary

• Igneous

• Metamorphic

• Basaltic

Answer explanation

Igneous rocks are formed by the cooling of magma or lava, making them the correct choice in this case.

What causes the phases of the Moon?

• The Earth's shadow falling on the Moon

• The Moon's shadow falling on the Earth

• The relative positions of the Earth, Moon, and Sun

• The Moon's orbit around the Sun

Answer explanation

The relative positions of the Earth, Moon, and Sun determine the phases of the Moon.