Planet Earth Quiz

Universe is composed of millions of galaxies, group of stars, group of constellations, clouds of dust and gases.

Answer explanation

The universe consists of various structures, including millions of galaxies, which are vast systems of stars, gas, and dust. This highlights the complexity and scale of the universe beyond just stars and constellations.

Which one of the following is the head of our solar family?

• The Moon

• The Earth

• The Sun

• The Jupiter

Answer explanation

The Sun is the center of our solar system and provides the gravitational pull that keeps the planets, including Earth and Jupiter, in orbit. Therefore, it is correctly identified as the head of our solar family.

Consider the following statements A and B and choose the correct answer. A. The celestial bodies which have their own light and heat are called planets. B. A group of stars which follow a certain pattern are called constellation.

• A is true, B is false

• Both A and B are false

• A is false, B is true

• Both A and B are true

Answer explanation

Statement A is false; celestial bodies that have their own light and heat are called stars, not planets. Statement B is true; a group of stars forming a pattern is indeed called a constellation. Therefore, both A and B are false.

The time period of one revolution of the Sun around the centre of the galaxy is called

• sidereal year

• astronomical year

• cosmic year

• light year

Answer explanation

The time period of one revolution of the Sun around the center of the galaxy is known as a cosmic year, not a sidereal year. A sidereal year refers to the Earth's orbit around the Sun. Therefore, the correct answer is cosmic year.

Consider the following statements A and B about the solar system and choose the correct answer. A. Neptune is the first planet found by mathematical prediction. B. Mars has longest revolution period in our solar system. C. Mercury is the only planet in our solar system that rotates East to West. D. Jupiter has fastest rotation period in our solar system.

• A and D

• B and C

• A, B and C

• A, B and D

Answer explanation

Statement A is true as Neptune was discovered through mathematical predictions. Statement B is false; Neptune has the longest revolution period. Statement D is true; Jupiter has the fastest rotation. Thus, the correct choice is A, B, and D.

Which of the following pairs is/are not correctly matched?

• Cassiopeia : Galaxy

• Andromeda : Biggest star outside the solar system

• Orion : Constellation

• Sirius : Brightest star outside the solar system

Answer explanation

Cassiopeia is a constellation, not a galaxy. Andromeda is a galaxy, not the biggest star; the biggest star is UY Scuti. Orion is correctly matched as a constellation, and Sirius is the brightest star visible from Earth.

When is a lunar eclipse caused?

• The Sun comes between the Earth and the Moon

• The Earth comes between the Sun and the Moon

• The Moon comes between the Sun and the Earth

• None of the above

Answer explanation

A lunar eclipse occurs when the Earth comes between the Sun and the Moon, blocking sunlight from reaching the Moon. This alignment is essential for a lunar eclipse to take place.

Which one among the following is not a feature of Lithosphere?

• planets

• celestial bodies

• stars

• constellations

Answer explanation

The lithosphere refers to the rigid outer layer of the Earth, which includes the crust and upper mantle. Planets are not a feature of the lithosphere; they are celestial bodies that can exist independently in space.

Which of the following is the brightest planet as visible from the Earth?

• Mercury

• Venus

• Mars

• Jupiter

Answer explanation

Venus is the brightest planet visible from Earth due to its thick atmosphere that reflects sunlight effectively. It often outshines other planets, making it easily recognizable in the night sky.

Which of the following cannot be said about our planet 'Earth'?

• It is a perfect sphere

• It is slightly flattened at the poles

• It has a bulge in the middle

• It is called the 'blue planet'

Answer explanation

Earth is not a perfect sphere; it is an oblate spheroid, slightly flattened at the poles and bulging at the equator. The term 'blue planet' refers to its appearance from space due to water coverage.