Ear | MCQs

Explanation

Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.

Explanation

The first technology of man on Earth is the use of fire.

This dating back to around 1.5-2.5 million years ago.

Fire provided early humans with a means of:

• Cooking food
• Providing warmth and light
• Warding off predators
• Clearing land for settlement and agriculture

Explanation

The Earth's South Magnetic Pole is geographically north, and the Earth's magnetic North Pole is geographically south, so free-moving magnets are always north-south.

Explanation

Hypocenter is the point beneath the Earth’s surface where the vibrations of an earthquake originates and which corresponds to the location where the motion on a fault surface starts.

Explanation

The moon is a satellite because it moves around Earth.

Earth and the moon are called "natural" satellites.

Explanation

• Earth revolves in orbit around the sun in one year, 6 hours, nine mins on the subject of the stars, at a velocity starting from 29.29 to 30.29 km/s.
• The 6 hours, 9 mins adds as much as approximately an extra day each fourth year, that's particular a leap year, with the more day brought as February twenty ninth.
• Earth's orbit is elliptical and reaches its closest method to the sun, a perihelion of 147,090,000 km, on approximately January fourth of each yr. Aphelion comes six months later at 152,100,000 km.
  

Explanation

• Earth is ranked fifth of eight by using length.
• however all of them are effortlessly dwarfed by way of any of the four gasoline giants (Jupiter, Saturn, Uranus and Neptune).
  

Explanation

At the center of the Earth, gravitational forces from all directions cancel out.

Hence, the net gravitational force (and weight) is zero.

Explanation

The troposphere is the lowest layer of the atmosphere, directly in contact with the Earth's surface.

It is where weather occurs and contains about 75% of the atmosphere’s mass.

The principle constituent of the atmosphere of the Earth is called Nitrogen.

Explanation

• Venus is the brightest planet.
• It has an atmosphere but no moons.
• It's identical in size, chemistry and gravity.
• It has volcanoes, mountains and sand.
• It's also called Sister Planet of the Earth.