Solar trivia quiz! Try your hand at little-known facts
We’re bringing you surprising trivia and fun facts about sunlight in a quiz format.
From how long it takes sunlight to reach Earth, to the best season for solar power generation, to unexpected origins in history—discoveries that will make you say “Wow!” the more you learn! Sunlight, essential to our lives and now more familiar than ever thanks to solar power, actually hides some amazing secrets.
With three multiple-choice options, it’s perfect for a fun family quiz time for kids and adults alike.
Ready to dive into the mysteries of the sun together?
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Solar trivia quiz! Take on some surprisingly little-known facts (1–10)
When is Solar Power Generation Day?
- June 21
- July 21
- August 21
See the answer
June 21
The answer is June 21. June 21 is the first day of the summer solstice and the day with the longest daylight of the year. As the characters for “geshi” (summer solstice) suggest—literally ‘reaching summer’—from around June 21, we gradually move into the height of summer. To highlight the importance and promote the adoption of solar power, this day is designated as Solar Power Day.
What else is mixed in sunlight besides ultraviolet and visible light?
- gamma rays
- X-ray
- infrared
See the answer
infrared
Sunlight can be broadly divided into three types of light: ultraviolet rays, visible light, and infrared rays. Infrared has a longer wavelength than visible light and is invisible to the human eye, but it is the main cause of the heat we feel. Visible light is electromagnetic radiation within the wavelength range detectable by the human eye, and ultraviolet rays are what cause sunburn.
What is the typical lifespan of solar panels?
- about 10 to 20 years
- About 20 to 30 years
- more than 30 years
See the answer
About 20 to 30 years
Many solar panels are generally considered to have a lifespan of about 20 to 25 years. This overlaps with the output warranty period set by manufacturers. Of course, depending on the operating environment and maintenance, they can sometimes be used longer, but because power generation efficiency gradually declines, around 20 years is a useful guideline.
Solar Power Trivia Quiz! Challenge Surprisingly Little-Known Facts (11–20)
Which of the following is not a correct advantage of solar power generation?
- Emits almost no carbon dioxide
- By storing electricity, you can be prepared for disasters.
- Power generation is not affected by weather or region.
See the answer
Power generation is not affected by weather or region.
Solar power generation emits almost no carbon dioxide during installation or operation, and when combined with storage systems, it has the advantage of enabling electricity use even during disasters. However, because the output of solar panels varies greatly depending on sunlight, weather, and the installation area, the statement that “generation is not affected by weather or region” is incorrect.
What do you call the practice of generating solar power while growing crops on agricultural land at the same time?
- solar sharing
- Solar irrigation
- agricultural power generation
See the answer
solar sharing
Solar sharing is an initiative in which solar panels are installed on farmland to generate solar power while cultivating crops at the same time. This not only leads to more effective land use, but also helps promote renewable energy and increase farmers’ incomes.
How long does it take for sunlight to reach the Earth?
- About 8 minutes and 20 seconds
- About 1 hour 45 minutes
- about 24 hours
See the answer
About 8 minutes and 20 seconds
It takes about 8 minutes and 20 seconds for sunlight to reach Earth. Since the speed of light is approximately 300,000 kilometers per second and the average distance between the Sun and Earth is about 150 million kilometers, light needs roughly 500 seconds—about 8 minutes and 20 seconds—to travel that distance.
What harmful substances to the human body are contained in sunlight?
- ultraviolet rays
- Ozone
- carbon dioxide
See the answer
ultraviolet rays
The ultraviolet (UV) radiation contained in sunlight is harmful to the human body. Prolonged exposure to ultraviolet rays increases the risk of health problems such as skin cancer and cataracts. Although part of the ultraviolet radiation is absorbed by the Earth’s ozone layer, some UV-B and UV-A still reach the ground and can cause health issues.