Explanation

Doab, a Persian term, signifies an area between two rivers. 

Explanation

The Kirthar Mountains are a mountain range that mark the boundary between the Pakistani provinces of Balochistan and Sindh,[ and which comprise much of the Kirthar National Park.

Explanation

The battle began on June 6, 1944, also known as D-Day, when some 156,000 American, British and Canadian forces landed on five beaches along a 50-mile stretch of the heavily fortified coast of France's Normandy region.

Explanation

The first digital camera was invented by Steven Sasson, an engineer at Eastman Kodak, in 1975.

Sasson's camera used a monochrome Fairchild CCD image sensor.

It was the first self-contained electronic camera.

Explanation

A large part of Grand Canyon lies within Grand Canyon National Park and is managed by the National Park Service.

Explanation

Spherical shape is because drop always tends to acquire minimum surface area due to the surface tension, and for a given volume, the surface area of sphere is minimum.

Explanation

The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886.

Explanation

It is located in Iran.

Explanation

 Allen Shepherd became the first American to travel into space in 1961, and in 1971, he walked on the Moon.

Explanation

Born: October 2, 1869, Porbandar, India

Full name: Mohandas Karamchand Gandhi

Assassinated: January 30, 1948, New Delhi, India

In an effort to end India's religious strife, he resorted to fasts and visits to the troubled areas. He was on one such vigil in New Delhi when Nathuram Godse, a Hindu extremist who objected to Gandhi's tolerance for the Muslims, fatally shot him.