Class 3 GK Questions - Earth and universe
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GK Questions - Class 3 - Earth and universe
Q1. Which gas is most abundant in the Earth's atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
Answer: b) Nitrogen
Explanation: Nitrogen is the most abundant gas in the Earth's atmosphere, constituting about 78% of the total air volume.
Q2. Which planet in our Solar System is known as the "Red Planet"?
a) Mercury
b) Venus
c) Mars
d) Jupiter
Answer: c) Mars
Explanation: Mars is often referred to as the "Red Planet" due to its reddish appearance, which is caused by iron oxide (rust) on its surface.
Q3. What is the name of the largest moon of Saturn?
a) Ganymede
b) Titan
c) Europa
d) Triton
Answer: b) Titan
Explanation: Titan is the largest moon of Saturn and the second-largest moon in the Solar System. It is known for its thick atmosphere and hydrocarbon lakes.
Q4. The Great Barrier Reef, the world's largest coral reef system, is located off the coast of which country?
a) Australia
b) Brazil
c) Indonesia
d) Egypt
Answer: a) Australia
Explanation: The Great Barrier Reef is located off the northeastern coast of Australia and is a UNESCO World Heritage site famous for its biodiversity and coral formations.
Q5. Which planet in our Solar System is known as the "Morning Star" or "Evening Star" and is often the brightest object in the night sky after the Moon?
a) Venus
b) Jupiter
c) Mars
d) Saturn
Answer: a) Venus
Explanation: Venus, also known as the "Morning Star" or "Evening Star," is the second planet from the Sun and is often visible in the morning or evening sky due to its brightness.
Q6. I am the first member of the Solar system, revolving around the Sun. I am the smallest among all the other members. What am I?
a) Earth
b) Mercury
c) Mars
d) Jupiter
Answer: b) Mercury
Explanation: Mercury is the smallest planet in the Solar system and it revolves around the Sun, being the first planet from it.
Q7. Why are we able to see the Moon?
a) It is a luminous object.
b) It reflects the light of the Earth.
c) It has a jungle of fireflies.
d) It reflects the light of the Sun.
Answer: d) It reflects the light of the Sun.
Explanation: The Moon is visible to us because it reflects the light of the Sun, illuminating its surface which is then visible from the Earth.
Q8. Why do astronauts wear an oxygen mask on the Moon?
a) There is no oxygen on the Moon.
b) There are poisonous gases on the Moon.
c) They want to be prepared for emergencies.
d) They are afraid of the people living over there.
Answer: a) There is no oxygen on the Moon.
Explanation: Astronauts wear oxygen masks on the Moon because there is no breathable atmosphere on the lunar surface, lacking oxygen to support life.
Q9. Why is there no life on the Moon?
a) It revolves around the Earth.
b) It revolves around the Sun.
c) It has no water and air.
d) It has no light.
Answer: c) It has no water and air.
Explanation: Life on Earth is sustained by water and air, both of which are absent on the Moon, making it uninhabitable.
Q10. Among these letters of the English alphabet, which one does NOT resemble one of the phases of the Moon?
a) C
b) D
c) A
d) O
Answer: c) A
Explanation: While letters like C, D, and O resemble the shapes of various moon phases, the letter A does not have a similar resemblance.
Q11. I am the largest moon in the Solar system and I orbit around Jupiter. What am I?
a) Titan
b) Ganymede
c) Enceladus
d) Triton
Answer: b) Ganymede
Explanation: Ganymede is the largest moon in the Solar system and it orbits around Jupiter, the largest planet.
Q12. I am the closest star to Earth and the center of our Solar system. What am I?
a) Alpha Centauri
b) Sirius
c) Proxima Centauri
d) Sun
Answer: d) Sun
Explanation: The Sun is the closest star to Earth and it is the center of our Solar system.
Q13. I am a celestial body made up of ice, dust, and gas, known for my bright coma and tail when I approach the Sun. What am I?
a) Asteroid
b) Meteor
c) Comet
d) Planet
Answer: c) Comet
Explanation: Comets are celestial bodies made up of ice, dust, and gas. When they approach the Sun, they develop a bright coma and a tail due to the solar wind.
Q14. I am the second smallest planet in the Solar system and the closest to the Sun. I have a very thin atmosphere. What am I?
a) Mercury
b) Venus
c) Mars
d) Uranus
Answer: a) Mercury
Explanation: Mercury is the second smallest planet in the Solar system and it is the closest to the Sun. It has a very thin atmosphere.
Q15. I am the only planet in the Solar system that rotates on its side, causing extreme seasons. What am I?
a) Saturn
b) Uranus
c) Neptune
d) Jupiter
Answer: b) Uranus
Explanation: Uranus is the only planet in the Solar system that rotates on its side, causing extreme seasons.
Q16. I am the largest planet in the Solar system, known for my iconic giant red spot. What am I?
a) Earth
b) Mercury
c) Mars
d) Jupiter
Answer: d) Jupiter
Explanation: Jupiter is the largest planet in the Solar system and is characterized by its famous Great Red Spot, a massive storm in its atmosphere.
Q17. I am the fifth planet from the Sun and have a beautiful system of rings around me. What am I?
a) Earth
b) Venus
c) Saturn
d) Uranus
Answer: c) Saturn
Explanation: Saturn, the sixth planet from the Sun, is well-known for its spectacular system of rings composed of ice and dust particles.
Q18. I am the only planet in the Solar system known to support life. What am I?
a) Earth
b) Mercury
c) Mars
d) Neptune
Answer: a) Earth
Explanation: Earth is the third planet from the Sun and is the only known celestial body to support life as we know it.
Q19. I am the only planet in the Solar system with a thick atmosphere composed mainly of carbon dioxide. What am I?
a) Earth
b) Venus
c) Mars
d) Uranus
Answer: b) Venus
Explanation: Venus is the second planet from the Sun and is known for its extremely dense and hot atmosphere, primarily made up of carbon dioxide.
Q20. I am a small, rocky planet known for my thin atmosphere and extensive system of canyons. What am I?
a) Earth
b) Mercury
c) Mars
d) Neptune
Answer: c) Mars
Explanation: Mars, also known as the "Red Planet," is the fourth planet from the Sun and is characterized by its reddish appearance, canyons, and volcanoes.
Q21. What is the main gas responsible for the greenhouse effect on Earth?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide
Explanation: Carbon dioxide is the main gas responsible for the greenhouse effect on Earth. It traps heat in the atmosphere, leading to global warming and climate change.
Q22. What causes the seasons on Earth?
a) Changes in the distance from the Sun.
b) The tilt of the Earth's axis.
c) The rotation of the Earth.
d) The speed of the Earth's orbit around the Sun.
Answer: b) The tilt of the Earth's axis.
Explanation: The changing seasons on Earth are primarily caused by the tilt of its axis relative to its orbital plane around the Sun. This tilt results in varying amounts of sunlight reaching different parts of the Earth throughout the year.
Q23. What is the main gas responsible for the greenhouse effect on Earth?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide
Explanation: Carbon dioxide is the main gas responsible for the greenhouse effect on Earth. It traps heat in the atmosphere, leading to global warming and climate change.
Q24. What causes the tides in the oceans?
a) The rotation of the Earth.
b) The gravitational pull of the Moon.
c) The gravitational pull of the Sun.
d) The presence of underwater volcanoes.
Answer: b) The gravitational pull of the Moon.
Explanation: The tides in the oceans are primarily caused by the gravitational pull of the Moon on the Earth, creating bulges in the ocean waters.
Q25. What causes the seasons on Earth?
a) Changes in the distance from the Sun.
b) The tilt of the Earth's axis.
c) The rotation of the Earth.
d) The speed of the Earth's orbit around the Sun.
Answer: b) The tilt of the Earth's axis.
Explanation: The changing seasons on Earth are primarily caused by the tilt of its axis relative to its orbital plane around the Sun. This tilt results in varying amounts of sunlight reaching different parts of the Earth throughout the year.
Q26. What is the main gas responsible for the greenhouse effect on Earth?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide
Explanation: Carbon dioxide is the main gas responsible for the greenhouse effect on Earth. It traps heat in the atmosphere, leading to global warming and climate change.
Q27. Why is the sky blue during the day?
a) It reflects blue light from the Sun.
b) It emits blue light.
c) It absorbs blue light from the Sun.
d) It reflects all colors equally.
Answer: c) It absorbs blue light from the Sun.
Explanation: The sky appears blue during the day because the Earth's atmosphere scatters shorter wavelengths of light (blue) more effectively, causing the blue light from the Sun to be absorbed and scattered in all directions.
Q28. What causes the tides in the oceans?
a) The rotation of the Earth.
b) The gravitational pull of the Moon.
c) The gravitational pull of the Sun.
d) The presence of underwater volcanoes.
Answer: b) The gravitational pull of the Moon.
Explanation: The tides in the oceans are primarily caused by the gravitational pull of the Moon on the Earth, creating bulges in the ocean waters.
Q29. What causes the seasons on Earth?
a) Changes in the distance from the Sun.
b) The tilt of the Earth's axis.
c) The rotation of the Earth.
d) The speed of the Earth's orbit around the Sun.
Answer: b) The tilt of the Earth's axis.
Explanation: The changing seasons on Earth are primarily caused by the tilt of its axis relative to its orbital plane around the Sun. This tilt results in varying amounts of sunlight reaching different parts of the Earth throughout the year.
Q30. What is the main gas responsible for the greenhouse effect on Earth?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide
Explanation: Carbon dioxide is the main gas responsible for the greenhouse effect on Earth. It traps heat in the atmosphere, leading to global warming and climate change.
Q31. What causes the tides in the oceans?
a) The rotation of the Earth.
b) The gravitational pull of the Moon.
c) The gravitational pull of the Sun.
d) The presence of underwater volcanoes.
Answer: b) The gravitational pull of the Moon.
Explanation: The tides in the oceans are primarily caused by the gravitational pull of the Moon on the Earth, creating bulges in the ocean waters.