The Earth and the Universe Quiz - CBSE Class 8 Social Science
Free practice quiz: The Earth and the Universe (CBSE Class 8 Social Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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What is the shape of the Earth?
- Flat
- Sphere
- Cube
- Cylinder
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Answer: B. Sphere
The Earth is an oblate spheroid, which means it is mostly spherical but slightly flattened at the poles and bulging at the equator. This shape is confirmed by satellite images and other scientific measurements.
What causes the seasons on Earth?
- Distance from the Sun
- Tilt of the Earth's axis
- Revolution around the Sun
- Atmospheric pressure
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Answer: B. Tilt of the Earth's axis
Seasons are caused by the tilt of the Earth's rotational axis away or toward the Sun as Earth orbits it, affecting the amount of sunlight received.
Which layer of the Earth is liquid?
- Crust
- Mantle
- Outer core
- Inner core
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Answer: C. Outer core
The outer core of the Earth is in a liquid state and is composed mostly of molten iron and nickel, while the inner core is solid.
What is a light year?
- Distance travelled by light in one year
- Time taken for light to travel
- A measure of time
- Speed of light
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Answer: A. Distance travelled by light in one year
A light year is the distance that light travels in one year in a vacuum, approximately 9.46 trillion kilometers.
What is the main component of the Sun?
- Hydrogen
- Helium
- Oxygen
- Carbon
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Answer: A. Hydrogen
The Sun is primarily composed of hydrogen (about 74%), which undergoes nuclear fusion to produce helium and energy.