Solar System — Set 4
Geography · सौर मंडल · Questions 31–40 of 70
The tail of a comet always points?
Correct Answer: A. Away from the Sun
The tail of a comet always points away from the Sun. This is caused by the solar wind pushing gas and dust away from the comet's head. As a comet approaches the Sun, the tail grows longer.
Who was the first to propose the Heliocentric model where planets revolve around the Sun?
Correct Answer: D. Copernicus
Nicolaus Copernicus proposed the Heliocentric model. He suggested that the Sun is at the center and planets revolve around it. This challenged the earlier Geocentric model which placed Earth at the center.
Which planet is known as Earth's 'Twin Sister' due to similar size and mass?
Correct Answer: D. Venus
Venus is often called Earth's 'Twin Sister' or twin planet. This is because they have a very similar size, mass, and density. However, their atmospheres and surface conditions are drastically different.
The darkest inner part of a shadow during an eclipse is called?
Correct Answer: D. Umbra
The darkest inner part of a shadow is called the Umbra. Observers in the umbra experience a total eclipse. The lighter outer shadow is called the Penumbra.
Olympus Mons, the tallest volcano in the solar system, is located on?
Correct Answer: A. Mars
Olympus Mons is located on Mars. It is a shield volcano that is nearly three times the height of Mount Everest. It is the largest volcano discovered in the solar system.
Triton is a major moon of which planet?
Correct Answer: A. Neptune
Triton is the largest moon of Neptune. It is unique because it orbits the planet in the opposite direction of Neptune's rotation (retrograde orbit). It is one of the coldest objects in the solar system.
Which planet would float if put in a giant bathtub of water?
Correct Answer: A. Saturn
Saturn is the only planet with a density less than that of water. Its average density is about 0.69 g/cm³, while water is 1 g/cm³. Therefore, theoretically, it would float.
The concept of 'Black Hole' was first predicted by the theory of?
Correct Answer: C. General Relativity
Black Holes were predicted by Albert Einstein's Theory of General Relativity. A black hole is a region where gravity is so strong that nothing, not even light, can escape. The boundary is called the event horizon.
What causes the phenomenon of tides on Earth?
Correct Answer: A. Gravitational pull of the Moon and Sun
Tides are primarily caused by the gravitational pull of the Moon and the Sun on Earth's oceans. The Moon has a greater effect due to its proximity. Earth's rotation also plays a role in the timing of tides.
The 'Oort Cloud' is believed to be the source of?
Correct Answer: C. Long-period Comets
The Oort Cloud is a theoretical spherical shell surrounding the solar system. It is believed to be the source of long-period comets. It lies far beyond the Kuiper Belt.