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Electric motor was invented by
In 1821 Faraday set about trying to understand the work of Ørsted and Ampère, devising his own experiment using a small mercury bath. This device, which transformed electrical energy into mechanical energy, was the first electric motor.
‘DVD’ was invented and developed by
Historic invention of the day: 1995: DVD is an optical disc storage format, invented and developed by Philips, Sony, Toshiba, and Panasonic in 1995. DVDs offer higher storage capacity than Compact Discs while having the same dimensions.
Who is known as ‘Father of Refrigeration’?
Jacob Perkins, who worked with Evans, received a patent for a vapor-compression cycle using liquid ammonia in 1835, according to History of Refrigeration. For that, he is sometimes called the "father of the refrigerator." John Gorrie, an America doctor, also built a machine similar to Evans' design in 1842.
Sir Isaac Newton was an
Although Isaac Newton is well known for his discoveries in optics (white light composition) and mathematics (calculus), it is his formulation of the three laws of motion the basic principles of modern physics for which he is most famous.
Alexander Graham Bell awarded US patent for his invention of telephone in
The date was February 14, 1876. He was the fifth entry of that day, while Gray's lawyer was 39th. Therefore, the U.S. Patent Office awarded Bell with the first patent for a telephone, US Patent Number 174,465 rather than honor Gray's caveat.
Rust is an oxide, usually red oxide formed by the reaction of metal ‘X’ and oxygen in the presence of water and air. Identify ‘X’.
Ferric oxide or Iron oxide commonly known as rust is the oxide of iron formed in the presence of water and air.
4Fe + 3O2 ---> 2Fe2O3
Time can be measured using many units depending on the duration of a phenomenon. Hours, minutes and seconds are common units of time. Which of the following is also a unit of time?
The word Fortnight was derived from Fourteen nights and it denotes the time period of 2 weeks which includes fourteen days and nights.
In which year the first nuclear test was conducted by India under the code-name of Smiling Budha?
Which kind of waves are used to make and receive cellphone calls?
NASA’s new spacecraft for astronauts will carry astronauts into deep space and then return them home to Earth. It will be able to travel till asteroids or even Mars. Which spacecraft are we talking about?