Physics Inventions — Set 4
Inventions · भौतिकी के आविष्कार · Questions 31–40 of 70
The first mechanical calculator, known as the 'Pascaline', was invented by?
Who is the inventor of the first practical electric fan, introduced in the 1880s?
The first synthetic fiber, Nylon, was invented by a team led by?
Who invented the first modern internal combustion engine using the 'Otto Cycle'?
The first practical submarine, the 'Turtle', was invented by whom in 1775?
Which scientist invented the first stethoscope using a wooden tube?
The ballpoint pen was invented and popularized by?
Who invented the first successful electric telegraph system in the United States?
The safety pin was invented and patented by which American inventor in 1849?
Who is the inventor of the first practical refrigerator using vapor-compression?