Class 3 GK Questions - Earth and environment

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GK Questions - Class 3 - Earth and environment

Q1. What is the state of matter in which metals are present in the outer core of Earth?

a) Solid

b) Liquid

c) Gas

d) A combination of all the states of matter

Answer: b) Liquid

Explanation: The metals in the outer core of the Earth exist in a liquid state due to the high temperature and pressure prevailing in that region.

Q2. What are the primary components of the inner core of Earth?

a) Nickel

b) Alumina

c) Silica

d) Nitrogen

Answer: a) Nickel

Explanation: The inner core of the Earth is mainly composed of iron and nickel.

Q3. Which part of the Earth is known to be the hottest?

a) Inner core

b) Outer core

c) Mantle

d) Crust

Answer: a) Inner core

Explanation: The inner core of the Earth is the hottest region on the planet, attributed to the immense pressure and temperature it experiences at its center.

Q4. What is Earth's position in relation to the Sun?

a) First

b) Second

c) Third

d) Fourth

Answer: c) Third

Explanation: Earth is the third planet from the Sun in our solar system.

Q5. What characteristic feature is unique to Earth?

a) Rings around the planet

b) Red planet

c) Presence of life

d) Has five natural satellites

Answer: c) Presence of life

Explanation: Earth stands apart from other known planets due to its exceptional attribute of supporting life.

Q6. In which layer of the Earth do we live in?

a) Crust

b) Core

c) Mantle

d) None of these

Answer: a) Crust

Explanation: We live on the Earth's crust, which is the outermost solid layer of the Earth.

Q7. What is the approximate thickness of the crust in the ocean floor?

a) 2 km

b) 5 km

c) 10 km

d) 25 km

Answer: b) 5 km

Explanation: The oceanic crust, found under the oceans, is approximately 5 kilometers thick.

Q8. What do we call the crust where we live?

a) Continental crust

b) Environmental crust

c) Core crust

d) Atmospheric crust

Answer: a) Continental crust

Explanation: The crust where we live, including the continents and landmasses, is called the continental crust.

Q9. What is the primary composition of the Earth's crust?

a) Silica and iron

b) Silica and alumina

c) Alumina and iron

d) none of these

Answer: b) Silica and alumina

Explanation: The Earth's crust is mainly composed of rocks containing silica and alumina, among other minerals.

Q10. Which layer of the Earth comes second after the crust?

a) Crust

b) Inner core

c) Mantle

d) Outer core

Answer: c) Mantle

Explanation: The mantle is the second layer of the Earth, lying below the crust and above the outer core.

Q11. What is the approximate depth of the Earth's mantle?

a) 1,000 km

b) 2,000 km

c) 2,500 km

d) 3,000 km

Answer: c) 2,500 km

Explanation: The mantle extends to a depth of approximately 2,500 kilometers beneath the Earth's surface.

Q12. Which layer of Earth is primarily composed of iron and nickel?

a) Crust

b) Continental crust

c) Mantle

d) Outer core

Answer: d) Outer core

Explanation: The outer core of the Earth is predominantly made up of iron and nickel.

Q13. The layer that protects us from harmful UV radiation is known as:

a) Ozone layer

b) Infrared layer

c) Carbon layer

d) Oxygen layer

Answer: a) Ozone layer

Explanation: The ozone layer is a region of Earth's stratosphere that contains a high concentration of ozone molecules. It plays a crucial role in absorbing harmful ultraviolet (UV) radiation from the sun, protecting life on Earth from its harmful effects.

Q14. The time taken by the Earth to complete one revolution around the sun is:

a) 1 hour

b) 1 day

c) 1 month

d) 1 year

Answer: d) 1 year

Explanation: The Earth takes approximately 365.25 days to complete one full revolution around the sun. This period is known as a year, and it is the basis for our calendar system.

Q15. The Earth belongs to which of these categories?

a) Star

b) Satellite

c) Planet

d) Constellation

Answer: c) Planet

Explanation: The Earth is classified as a planet. It is the third planet from the sun in our solar system and is one of the few known celestial bodies that support life.

Q16. The energy of the Sun that we use on Earth is called:

a) Electric energy

b) Solar energy

c) Heat energy

d) Light energy

Answer: b) Solar energy

Explanation: The energy of the Sun that is harnessed and used on Earth is known as solar energy. Solar energy is converted into electricity or heat to power various applications, such as generating electricity, heating water, and more.

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