Because older adults have a wealth of life experience, they tend to have a lot of general knowledge.
Even so, there may still be things they don’t know yet.
This time, we’re introducing a general-knowledge quiz recommended for seniors.
There are many things people surprisingly don’t know, and some may learn something for the first time through this quiz! No matter your age, making new discoveries is exciting.
Aiming for a perfect score can also be a great opportunity to study a variety of topics.
Thinking is also recommended for dementia prevention.
Enjoy building your knowledge together with everyone.
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[For Seniors] Surprisingly Unknown! General Knowledge Quiz (1–10)
Which vegetables are non-toxic?
- tomato
- potato
- daikon radish
See the answer
daikon radish
The answer is daikon (Japanese radish). Tomatoes contain an alkaloid toxin called tomatine, and potato sprouts and green parts contain a type of natural toxin called solanine. Daikon doesn’t contain toxins, but if you remove its bitterness (aku-nuki) before eating, it will taste even better.
What do the little seeds on strawberries become?
- fruit
- seed
- Flower
See the answer
fruit
In fact, the part of the strawberry we eat isn’t the fruit but the receptacle. The tiny bumpy bits on the surface are the actual fruits. Each one of those little seeds contains a seed inside. Amazingly, a strawberry is an aggregate fruit made up of about 200 to 300 individual fruits.
What is another name for celery?
- Kiyomasa carrot
- Ieyasu carrot
- Nobunaga carrot
See the answer
Kiyomasa carrot
The name “Kiyomasa carrot” was given because Kato Kiyomasa brought it back during the Korean invasions. Celery has a distinctive flavor, so people may be divided on whether they like it, but it’s rich in nutrients and good for your health. Try making it into an easy-to-eat namul or a light pickle.
How long is the shelf life of ice cream?
- half a year
- 1 year
- No deadline
See the answer
No deadline
Ice cream generally does not have a best-before date. This is because ice cream stored at −18°C (0°F) or below undergoes almost no quality deterioration, so omitting the best-before date is permitted under the Consumer Affairs Agency’s food sanitation standards. However, conditions vary depending on how the freezer is managed, so to keep it tasting its best, it’s recommended to eat it as soon as possible.
What is a creature that is not a fish?
- shark
- orca
- ray
See the answer
orca
Orcas are popular at aquariums, aren’t they? They’re often thought to be fish, but they’re actually mammals. They mainly live in colder waters and are also known for their resemblance to dolphins. As carnivores at the top of the food chain, they have no natural predators and are sometimes called the ocean’s most powerful hunters.
What nutrients help prevent stress from building up?
- vitamin
- Niacin
- piotin
See the answer
vitamin
Stress is bad for your body when it builds up. If you don’t get enough vitamin C, you’re more likely to feel irritable. Include foods rich in vitamin C to help keep stress from accumulating. Vitamin E also helps regulate the autonomic nervous system, B vitamins support emotional stability, and calcium helps calm nervous excitability.
What dishes were commonly served on school lunch menus in the Showa era?
- Soki soba
- somen (thin Japanese wheat noodles)
- soft noodles
See the answer
soft noodles
Soft noodles were developed as a school lunch menu item and were a staple of Showa-era school lunches. Because they pair well with many kinds of sauces, they became a flavor loved by many people. Before soft noodles became the standard, in the postwar period bread was the typical school lunch item.


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