Question

3. Lighthouse is not an invention made by any single
person. In the same way, there are many other such
inventions which were made with the collective effort
of many persons. Make a list of them
​

Answer 1

Wheel is an invention of many persons. First they put the load in a wooden box and dragged them and they used the round logs of wood as wheels. Then the wheel were made of light iron rings. Metal wheels were used. Then light rubber tubes and tyers were used to make wheels

Answer 2

Answer:

• This absorbing new book tells the stories behind the inventions that have changed the world, with details about convenience items, such as safety pins, toothbrushes, and bifocals Weapons of war, including explosives, gunpowder, and shrapnel shells Industrial advances, such as the steam engine and the power loom for

• 1918: First colour movie shot Cupid Angling. 1920: Invention of TV by John Logie Baird and First Radio Commercial Broadcast by KDKA radio station a daughter company of Westinghouse Electric and Manufacturing Company. 1923: The first news Magazine was Launched - TIME. 1927: First TV transmission by Philo Farnsworth.