Olympiad Test Level 1: Scientific and Technological Development and Inventions- 2 - Class 6 MCQ

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.

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.

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.

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.

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.

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

The word Fortnight was derived from Fourteen nights and it denotes the time period of 2 weeks which includes fourteen days and nights.

• On 18 May 1974, India conducted its first nuclear test at Pokhran in Rajasthan.
• The Indian government claimed the test was for peaceful purposes only, naming it "Smiling Buddha". It involved a fission device using plutonium.
• Although officially known as Pokhran I, the 1974 test was informally named “Smiling Buddha” and is frequently referred to as such.

• The basic building block of radio communications is a radio wave. Like waves in a pond, a radio wave is a series of repeating peaks and valleys. 
• Radio waves are a type of electromagnetic radiation best known for their use in communication technologies, such as television, mobile phones, and radios. 
• It is generated by a transmitter and then detected by a receiver. These devices receive radio waves and convert them to mechanical vibrations in the speaker to create sound waves.

• NASA’s Orion spacecraft is built to take humans farther than they’ve ever gone before. Orion will serve as the exploration vehicle that will carry the crew to space, provide emergency abort capability, sustain the crew during the space travel, and provide safe re-entry from deep space return velocities.
• The mission will pave the way for flights with astronauts beginning in the early 2020s.