Explanation

A lunar eclipse occurs when the Moon moves into the Earth's shadow.

This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned with Earth between the other two, and only on the night of a full moon.

Explanation

Albert Bruce Sabin was a Polish American medical researcher.

Known for developing the oral polio vaccine which has played a key role in nearly eradicating the disease.

Explanation

A Manometer is a device to measure pressures.

A common simple manometer consists of a U shaped tube of glass filled with some liquid. 

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

Explanation

Moist air is lighter and less dense than dry air with the same temperature and pressure.

Explanation

The driver-side airbag is a container containing about 50 grams of sodium azide.

 The passenger side container holds about 200 grams of sodium azide.

Explanation

The human hand has 27 bones:

the carpals or wrist accounts for 8

the metacarpals or palm contain five

the remaining fourteen are digital bones; fingers and thumb.

while 

The number of bones in a human skull is 22

300 bones are there in a newly born infant.

Explanation

Venus is known as Earth's sister planet because both planets are a lot similar to each other.

Mars is called the brother of the Earth.

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Explanation

A celestial body that revolves around a planet is known as a natural satellite.

A celestial body that revolves around a planet is known as a moon.

Moons are natural satellites orbiting planets and can vary in size and composition.