Multiple choice physics questions related to energy, water cooling, food chains, greenhouse gases, and mirrors.
Understand the Problem
The image contains multiple-choice questions from a physics exam for Class VIII students. The questions cover topics such as potential energy, the behavior of water when cooled, energy transfer in food chains, greenhouse gases, and the number of images formed by perpendicular mirrors. The questions requires selection of the correct answer from the provided options.
Answer
Here are the answers: i) Double, ii) First contract and then expand, iii) Producers, iv) Nitrogen, v) 3
Here are the answers to the multiple-choice questions: i) b) Double ii) c) First contract and then expand iii) a) Producers iv) b) Nitrogen v) b) 3
Answer for screen readers
Here are the answers to the multiple-choice questions: i) b) Double ii) c) First contract and then expand iii) a) Producers iv) b) Nitrogen v) b) 3
More Information
Here is some additional information about the questions: i) Potential energy is directly proportional to height. If the height doubles, the potential energy also doubles. ii) Water contracts as it cools from 10°C to 4°C, then expands as it cools from 4°C to 0°C. iii) Producers, like plants, convert light energy into chemical energy through photosynthesis, which is how energy enters the food chain. iv) CFC, Methane, and Carbon dioxide are all greenhouse gases. Nitrogen is not. v) When two plane mirrors are held perpendicular to each other, three images are formed.
Tips
A common mistake is confusing the behavior of water when it freezes. Water behaves differently from most substances, expanding instead of contracting when it freezes.
Sources
- Climate Literacy Quiz - cleanet.org
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