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Question 1
A student burns a 12-gram piece of magnesium ribbon in a sealed flask containing 8 grams of oxygen gas. A bright white flash occurs, producing magnesium oxide powder. What is the total mass of the contents inside the sealed flask after the reaction?
Correct Answer:
20 grams.
Question 2
A 1,000-kg car accelerates from 10 meters per second to 20 meters per second. How does the car's kinetic energy change when its velocity doubles?
Correct Answer:
The kinetic energy quadruples (increases by 4 times).
Question 3
A swimmer pushes backward against the pool wall with her feet with a force of 200 Newtons. According to Newton's Third Law, what force does the pool wall exert on the swimmer's feet?
Correct Answer:
200 Newtons forward in the opposite direction.
Question 4
A student observes microscopic cells under a microscope and identifies chloroplasts and a rigid cell wall. Which type of cell is the student observing?
Correct Answer:
A plant cell.
Question 5
Which statement correctly contrasts the outcome of mitosis with meiosis in multicellular organisms?
Correct Answer:
Mitosis creates 2 genetically identical daughter cells, while meiosis creates 4 genetically diverse gametes.
Question 1
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About this Exam

Prepare with the Washington Comprehensive Assessment of Science (WCAS) Grade 8 Practice Questions - Washington Comprehensive Assessment of Science - Grade 8 Exam practice quiz. This question bank includes 100 questions covering energy, rock, cell, student, and washington. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Washington Comprehensive Assessment of Science (WCAS) Grade 8 Practice Questions - Washington Comprehensive Assessment of Science - Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on energy, rock, cell, student, and washington. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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