Questions

Here Joystick, Mouse and Scanner are Input devices through which data is given to the computers. But Headphones are output devices through which sound comes as an output from the computer or any devices.

Meteorology is the study of weather and Earth's atmosphere. Climatology is another term used to describe the study of weather.

Studying the weather is not only useful for determining if you'll need an umbrella for the day. While forecasting is an important aspect of studying weather, understanding weather patterns provides valuable information about the status of the planet.

It was the Qing Dynasty, who was a Manchu Dynasty whose rule ended in 1911 Chinese revolution.

Lithoshpere are composed of rocks in the crust and upper mantle that behave as brittle solids. The lithosphere is Earth's outermost layer.

B.R. Ambedkar

The Length of the Day is determined in Astronomical Units.

The length of a day corresponds to the time the Earth takes to turn around on its axis, which is approximately 24 hours. But it's not exactly 24 hours. 

This phenomenon is due to tides raised by the Moon which slow Earth's rotation. Because of the way the second is defined, the mean length of a day is now about 86 400.002 seconds, and is increasing by about 1.7 milliseconds per century.