Do You Know
Questions & Answers on General Knowledge.
How does a smoke alarm work?
The most common type of smoke detector uses a tiny amount of a radioactive element called americium to inject electric charges into the air. In the absence of smoke, these electric charges attach themselves to individual air molecules and the resulting ions (electrically charged molecules) move rather easily through the air. However, if there is smoke present in the air, the electric charges attached themselves to the smoke particles and the resulting charged smoke particles don't move easily through the air. The smoke detector measures how easily the charged items it produces move through the air. If these items move easily, then the air is clean. However if they don't move easily, the air contains smoke and the detector signals danger.
If I were to heat up a brownie and a white piece of cake, would the brownie heat up faster by radiation transfer because of its darker color?
Which is the highest waterfall in South America?
How does fuzz on a tennis ball make it fly faster? It seems counterintuitive to me.
What English words rhyme with orange, purple, and silver?
Why does water sound loudest just before it reaches the boiling point, and then why does it get quieter once it actually boils?
Why are men’s and women’s bicycles built differently?
What is Brewster's angle?
If all the laws of physics always happen the same, then what relevance does the frame of reference have?
How did the poem “Mary Had a Little Lamb” become so famous?
Can you get a tan from an ultraviolet light bulb?
What colour is the sky above Mercury?
What is pop music?
Where is Napoleon's throne?
How long have people lived in Australia?
Is there any substance that can stop magnetic fields
Please explain pectin and why sugar and acid are needed when making jelly.
What was Renaissance literature about?
At what angles do light rays reflect out of a prism?
What is an insect?
What is a tarsier?
Which city is the largest?
Is it true that Tesla invented a way to send electrical power without the use of power lines? If so, how?
Please explain the concepts of magnetism pertaining to ferromagnetism, diamagnetism, and paramagnetism.
Do hippopotamuses sweat blood?
Are there any other dwarf planets?
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