1.
A solar cooker was invented by three American scientists in 1953.
Correct Answer
B. False
Explanation
cooker -> cell
2.
A solar cell could change sunlight into eletricity.
Correct Answer
A. True
Explanation
A solar cell is a device that converts sunlight directly into electricity through the photovoltaic effect. This process involves the absorption of photons from sunlight by a semiconductor material, which then generates an electric current. Therefore, it is correct to say that a solar cell can change sunlight into electricity.
3.
Solar cells are even smaller and brighter than before.
Correct Answer
B. False
Explanation
The statement suggests that solar cells have become smaller and brighter than before. However, the correct answer is False, indicating that the statement is not true. The explanation for this could be that while solar cells have indeed become more efficient and advanced over time, it does not necessarily mean that they have become smaller and brighter. The size and brightness of solar cells can vary depending on the specific technology and design used.
4.
A cell phone can be plugged into the battery of a solar backpack.
Correct Answer
A. True
Explanation
A solar backpack is designed with built-in solar panels that can convert sunlight into electrical energy. This electrical energy is stored in a battery within the backpack. Therefore, it is possible to plug a cell phone into the battery of a solar backpack and charge it using the stored solar energy.
5.
What was the solar cell a great invention?
Correct Answer
D. It could create electricity.
Explanation
The solar cell was a great invention because it could create electricity. This innovation allowed for the conversion of sunlight into usable electrical energy, providing a clean and renewable source of power. The ability of the solar cell to generate electricity was a significant breakthrough in the field of energy production, offering a sustainable alternative to traditional fossil fuels and reducing reliance on non-renewable resources.
6.
Why is the future of solar energy bright? Check ALL answers.
Correct Answer(s)
B. The price of solar cells decreases every year.
C. Solar energy does not harm the environment.
D. Solar energy will never be used up.
Explanation
The future of solar energy is bright because the price of solar cells decreases every year, making them more affordable and accessible. Additionally, solar energy does not harm the environment, as it is a clean and renewable energy source. Furthermore, solar energy will never be used up, ensuring its long-term sustainability and availability.
7.
Choose All the options that mean to put things away and keep them until you need them.
Correct Answer(s)
A. Squirrels are storing up nuts for the winter.
D. He hoped the electronic equipment was safely stored away.
Explanation
The correct answer options, "Squirrels are storing up nuts for the winter" and "He hoped the electronic equipment was safely stored away," both imply the act of putting things away and keeping them until they are needed. In the first option, squirrels are collecting and storing nuts to have a food supply during the winter months. In the second option, someone is hoping that the electronic equipment has been stored in a safe place for future use. Both actions involve the concept of putting things away and keeping them until they are needed.
8.
What is the word for the blank?
The solar cells change ________ into electricity.
Correct Answer(s)
sunlight
Explanation
The word for the blank is "sunlight" because solar cells have the ability to convert sunlight into electricity.
9.
In the text, many scientists think _____ energy will be the main future energy.
Correct Answer(s)
solar
Explanation
Many scientists believe that solar energy will be the main future energy source. This is because solar energy is renewable, abundant, and does not produce harmful emissions. Additionally, advancements in solar technology have made it more efficient and cost-effective. Solar energy can be harnessed through the use of solar panels, which convert sunlight into electricity. As the world continues to prioritize sustainability and reduce reliance on fossil fuels, solar energy is seen as a promising solution to meet future energy needs.
10.
In the text, ______ means a thing that you get something from.
Correct Answer(s)
source
Explanation
In the context of the text, the word "source" refers to a thing or place from which something is obtained or originates. It could be a person, document, website, or any other entity that provides information or supplies something. The term "source" indicates the origin or starting point of something, and it is commonly used in various fields such as research, journalism, and academia to refer to the origins or references of information or data.