Quizizz Science Review: Part 2

What force pulls objects toward Earth?

• Magnetism

• Gravity

• Friction

• Electricity

Answer explanation

The force that pulls objects toward Earth is gravity. It is a natural phenomenon that attracts two bodies with mass towards each other, which is why we experience weight and why objects fall when dropped.

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What is the process by which new species develop over time due to natural selection?

• Evolution

• Photosynthesis

• Respiration

• Condensation

Answer explanation

The process by which new species develop over time due to natural selection is called evolution. It involves changes in traits that enhance survival and reproduction, leading to the emergence of new species.

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What is a hypothesis?

• A. A final answer that cannot change

• B. A wild guess with no reasoning

• C. An educated prediction that can be tested

• D. A scientific law that explains a natural event

Answer explanation

A hypothesis is an educated prediction that can be tested through experiments or observations, making option C the correct choice. It is not a final answer, a wild guess, or a scientific law.

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NGSS.MS-PS1-2

What process allows plants to make their own food using sunlight, carbon dioxide, and water?

• Photosynthesis

• Respiration

• Decomposition

• Fermentation

Answer explanation

Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into glucose and oxygen, allowing them to produce their own food. This distinguishes it from respiration, decomposition, and fermentation.

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What is the movement of heat in liquids and gases that causes warm air to rise and cool air to sink?

• Radiation

• Conduction

• Convection

• Reflection

Answer explanation

The movement of heat in liquids and gases that causes warm air to rise and cool air to sink is called convection. This process involves the transfer of heat through the movement of fluid, making convection the correct answer.

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Why should a scientist perform multiple trials in an experiment?

• To ensure the results are valid and reliable

• To prove the hypothesis is always correct

• To make the experiment more difficult

• To eliminate the need for recording data

Answer explanation

Performing multiple trials helps ensure the results are valid and reliable by minimizing the impact of random errors and variability. This strengthens the conclusions drawn from the experiment.

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What happens to an object's energy as it moves from a high position to a lower position?

• A. It gains kinetic energy and loses potential energy

• B. It gains potential energy and loses kinetic energy

• C. It loses both kinetic and potential energy

• D. Its energy remains unchanged

Answer explanation

As an object moves from a high position to a lower position, it loses potential energy due to the decrease in height and gains kinetic energy as it accelerates. Thus, the correct answer is A.

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Which statement about a hypothesis is correct?

• A. A hypothesis is always correct

• B. A hypothesis must be tested before conclusions are made

• C. A hypothesis is a fact that cannot be changed

• D. A hypothesis and a scientific law are the same thing

Answer explanation

B is correct because a hypothesis is a testable statement that requires experimentation to validate or refute it. A hypothesis is not always correct, is not a fact, and is distinct from a scientific law.

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How does the scientific method affect scientific knowledge over time?

• It allows science to change as new discoveries are made

• It prevents scientists from testing new ideas

• It ensures all scientific theories remain the same forever

• It only applies to controlled experiments in laboratories

Answer explanation

The scientific method promotes adaptability in science, allowing knowledge to evolve with new discoveries. This dynamic process is essential for scientific progress, unlike the other options that suggest rigidity or limitation.

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Why do astronauts experience less gravitational pull on the Moon than on Earth?

• The Moon has less mass than Earth

• The Moon is farther from the Sun

• The Moon has a stronger atmosphere

• The Moon has more water than Earth

Answer explanation

Astronauts experience less gravitational pull on the Moon because the Moon has less mass than Earth. Gravitational force is directly related to mass; thus, a smaller mass results in weaker gravity.

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