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Friday, 3 September 2021

Why is only one side of the Moon visible from Earth?


 Why is only one side of the Moon visible from Earth?


 It is a small body which is a quarter of the Earth in size. The Moon revolves around the Earth in about 27 days 7 hours 43 minutes 15 seconds and rotates on its axis in the same time, which is why only one side of the Moon is visible from Earth.


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Thursday, 2 September 2021

What is a lunar eclipse called?


 What is a lunar eclipse called?


 A lunar eclipse occurs when the Earth comes between the Sun and the Moon in such a way that the entire or partial part of the Moon is covered by the Earth's shadow. When the earth blocks the sun's rays from reaching the moon in this situation, then a lunar eclipse is visible in that part of the earth. Due to this geometric restriction, a lunar eclipse can occur only on the full moon night.


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Wednesday, 1 September 2021

How is day and night?


 How is day and night?


 The Earth revolves around the Sun and keeps on rotating on its own, so the part which is in front of the Sun there is day and the part which is not in front there is darkness which is called night.  It takes one year to complete the entire circumambulation and 24 hours to revolve once on its own.


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Tuesday, 31 August 2021

What is water?


 What is water?


 Water or water is a common chemical substance whose molecule is made up of two hydrogen atoms and one oxygen atom - H2O It is the basis of life of all living beings.  Usually the term water is used for the liquid state, but it is also found in the solid state (ice) and the gaseous state (steam or water vapour).  Water is also found in the form of liquid-crystals on water-affinity surfaces.


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Monday, 30 August 2021

Interesting facts about bears.


Interesting facts about bears

 1. By counting the small rings in the teeth of a bear with the help of a microscope, its age can be estimated.


 2. Bears have layers of skin.  The smaller layer keeps it warm while the larger layer protects its skin and the smaller layer of skin from water.


 3. Bears are very intelligent creatures.  If a hunter has put any bait to hunt them, then the bears understand it well and eat the bait carefully.


 4. Jungle bears live up to thirty years of age while captive bears (which have been imprisoned by humans) can live up to 47 years.


 5. Only polar bears are completely carnivorous while all other bears are omnivores i.e. both animal and plant eaters.


 6. The claws of the sun bears are the largest.  Apart from this, their tongue is also the longest, which reaches up to 9 and a half inches.


 7. Bears can run at a speed of 64 kilometers per hour, which is enough to catch a running horse.  The fastest man alive now means that Usain Bolt can run at a speed of 43 kilometers per hour.


 8. The heart rate of an ordinary bear is 40 per minute while that of a bear sleeping in winter sleep is 8 per minute.


 9. Some bears can walk on both their hind legs.  That's why sometimes looking from a distance, they seem as if some human is walking in a strange way.


 10. Black bear is not completely black, but it is like some rainbow, its skin is from black to red-brown and then white is slightly white.


 11. Bears are mammals that can see in colors, whereas most use waves instead of colours.


 12. The most common bear in the world is the brown bear.


 13. When the bears mate when the female bear does not lay the eggs in her womb but keeps them inside but outside the womb for a few months to develop.


 14. The legs of a bear are like a bow.  This makes their grip and balance even better.


 15. A swimming polar bear can jump 8 feet long to get it.


 16. A panda bear has an extra thumb, which is actually a protruding bone of their wrist.  It helps them to uproot the bamboo which they eat. A panda bear can eat up to 21 kg of bamboo in a day.


 17. The head of the giant panda bear is very big.  Scientists believe that this is due to their strong jaw and neck muscles which help them to chew bamboo.  Bamboo accounts for 99 percent of their diet.  And the remaining one percent are insects on the bamboo and then the meat which they get somewhere.


 18. Termites are the favorite food of South American bears.  These bears do not have front teeth, so they easily suck the termites and insects trapped in the hives.


 19. Most bears known so far can eat everything.  Even snowmobile seats, engine oil and rubber boots.


 20. About 98 percent of America's grizzly bears live in Alaska.


 21. A polar bear can swim up to 160 km without rest.


 22. Bears can see as well as humans.  But their hearing parity is a little less than us.  But the smell of bears is 100 times more than that of humans.  Polar bears can easily smell odors up to 32 km away.  Apart from this, she can easily smell the smell of sea fish buried up to three feet inside the ice.


 23. 'Bear' is an old English word which means - 'Shining brown.'


 24. Bear is the symbol of United Russia party which shows their power and pride.  Apart from this, the bear also appears in many fairy tales and myth stories.


 25. The polar bear is the largest species of bear. A one-time polar bear weighs up to 480 kg, which is equivalent to eight adult humans.  But the female polar bear is 50 percent smaller than the male.


 26. There are also some black bears that turn into white bears.  These bears are very rare.  Some Americans believe that they have some divine power.


 27. The evolution of bears grew from small to large.  Earlier bears were only the size of a dog.  The oldest known bear ever known is the Dawn bear, which lived on Earth 20 million years ago and is only the size of a small dog.


 28. Bears never lived in Australia and Antarctica.  Although bears are not found in Africa even at present.  But most of the skeletons of bears have been found from Africa.  Scientists are still unknown why it is no longer living in Africa.


 29. The South American bear is the only bear that is more active at night.


 30. Polar bears have about 9,600 hairs in an inch square of skin.


 31. The front paws of the bear's feet are bigger than the hind paws.


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What is Oxygen?


 What is Oxygen?


 Oxygen is denatured with O2 Oxygen is a tasteless, colorless and odorless gas, we know oxygen in Hindi or its Hindi name is Zarak. There are many such substances in our earth which contain oxygen. Oxygen is found in free state in air.


 Oxygen is an essential element of almost all bodily substances of plants and animals. Which is the air of our atmosphere. It has only about 30" of oxygen.


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Sunday, 29 August 2021

What is fire or fire?


 What is fire or fire?


 Fire is the rapid oxidation of a combustible substance by which heat, light, and many such gases mix in it.  The color and speed of the fire can change due to impurities in whatever combustible material is there.


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Saturday, 28 August 2021

What is air or air?


 What is air or air?


 Air is a mixture of different gases. In which the amount of nitrogen is highest, 78 percent, while 21 percent oxygen and 0.03 percent carbon dioxide are found and the remaining 0.97 percent is other gases. According to the estimates of scientists, there is about 6 lakh billion tons of air in the Earth's atmosphere.


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Friday, 27 August 2021

How do fish survive in water?


 How do fish survive in water?


 Everyone needs oxygen to survive. That's why fish have special organs i.e. gills. These are found on either side of their head. Fishes open their mouths to breathe underwater and pump them towards the gills. After this, with the help of membranes present in the gills, they absorb the oxygen present in the water. After this, this water comes out by opening the gills.


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Thursday, 26 August 2021

Why doesn't a big iron ship sink in water?


 Why doesn't a big iron ship sink in water?


 Archimedes' principle that when an object is put in water, the weight of the water displaced by it is equal to the weight of that object. And the force of the removed water bounces it back upwards.


 Therefore, when a piece of iron is put in water, then the upward force of the water displaced by it gets a smaller size. Could take advantage of the power coming from.


 The volume of an iron ship is greater than its weight. An iron ship displaces water equal to its volume, this displaced water exerts a force equal to its volume on the ship, which makes the ship float on the water. While the volume of a piece of iron is less than its weight, the water displaced by it is less than its weight causing it to sink.


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Wednesday, 25 August 2021

Fresh eggs sink in water, not old ones Why?


 Fresh eggs sink in water, not old ones Why?


 Fresh eggs sink in water, old ones do not sink.  This is because airborne particles increase within the older eggs.  This increases its size.


 The reason why eggs float in salty water is that due to the addition of salt, the density of the water increases and the egg floats.


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Who is the first person in the world to go into space?

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