STAAR Success - Grade 8 Science - Practice #2

Read each question carefully. Choose the best answer to each question. For open-response questions, determine the best answer to the question.

Li-Fi technology uses light waves for data transmission. Which of the following is a limitation of Li-Fi compared to Wi-Fi?

Perovskite solar cells have gained attention in renewable energy research. What is a significant advantage of perovskite solar cells compared to traditional silicon-based solar cells?

Explain how the design of the suspension bridge helps distribute the forces of tension and compression during high winds. Use the labeled components in the diagram to support your explanation.

Graphene, a single layer of carbon atoms arranged in a hexagonal lattice, exhibits remarkable properties. Which of the following is NOT a characteristic of graphene?

Which process ensures genetic diversity in sexually reproducing organisms?

Explain how a beneficial mutation can affect an organism's survival and lead to evolution over time.

Which type of wave can travel through a vacuum?

Describe two possible consequences of the observed polar ice cap melting for global systems. Use evidence from the images to support your answer.

Which statement best describes potential energy?

A skier at the top of a hill has potential energy. Describe what happens to this energy as the skier moves down the hill.

This question has two parts. First, answer Part A. Then, answer Part B.

Part A: A car is moving at a constant speed of 20 m/s. What can you conclude about the net force acting on the car?

Part B: Which scenario would change the conclusion in Part A?

A 10 kg object accelerates at 2 m/s². What is the net force acting on it?

This question has two parts. First, answer Part A. Then, answer Part B.

Part A: A student observes that a wave has a wavelength of 2 meters and a frequency of 5 Hz. What is the speed of the wave?

Part B: If the frequency of the wave in Part A doubles while the speed remains constant, what happens to the wavelength?