STEP English Practice Questions - Standardized Test Of English Proficiency (STEP) Exam

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Passage: "Solar panels convert sunlight directly into electricity using a material called silicon. When sunlight strikes silicon cells, electrons are knocked loose and begin to flow, creating an electric current. Because sunlight is free and renewable, solar power produces no fuel costs and very little pollution once panels are installed. However, solar panels generate electricity efficiently only during daylight hours, so many solar systems rely on batteries or a connection to the traditional power grid to supply electricity at night or on cloudy days." What is the main idea of the passage?

Silicon is the most expensive material used in electronics. Solar panels generate clean electricity from sunlight but need backup power sources when the sun is not shining. Batteries are more efficient than solar panels at producing electricity. Cloudy weather permanently damages solar panel cells.

Correct Answer:

Solar panels generate clean electricity from sunlight but need backup power sources when the sun is not shining.

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