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Test: Our Universe- 2


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10 Questions MCQ Test Social Science for Class 3 | Test: Our Universe- 2

Test: Our Universe- 2 for Class 3 2022 is part of Social Science for Class 3 preparation. The Test: Our Universe- 2 questions and answers have been prepared according to the Class 3 exam syllabus.The Test: Our Universe- 2 MCQs are made for Class 3 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Our Universe- 2 below.
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Test: Our Universe- 2 - Question 1

Seventh planet from sun is:

Detailed Solution for Test: Our Universe- 2 - Question 1

  • Uranus orbits our Sun, a star, and is the seventh planet from the Sun at a distance of about 1.8 billion miles (2.9 billion kilometers).
Test: Our Universe- 2 - Question 2

The biggest planet is

Detailed Solution for Test: Our Universe- 2 - Question 2

  • Jupiter, being the biggest planet, gets its name from the king of the ancient Roman gods.
Test: Our Universe- 2 - Question 3

Different seasons on earth are due to:

Detailed Solution for Test: Our Universe- 2 - Question 3

The revolution of the Earth around the Sun on a tilted axis.

Test: Our Universe- 2 - Question 4

An astronomer is a scientist who studies _______.

Detailed Solution for Test: Our Universe- 2 - Question 4

An astronomer is a scientist who studies celestial bodies such as moons, planets, stars, nebulae, and galaxies.

Test: Our Universe- 2 - Question 5

What is an astronomer likely to use?

Detailed Solution for Test: Our Universe- 2 - Question 5

An astronomer needs a telescope to see distant objects like planets and galaxies which are far off in the universe.

Test: Our Universe- 2 - Question 6

What is the center of the solar system?

Detailed Solution for Test: Our Universe- 2 - Question 6
  • Sun is the center of the solar system.
  • Although, earlier it was believed that Earth forms the center of the solar system.
  • However, after studies conducted by scientists it was proved that sun is at the center of the universe and all celestial bodies revolve around the sun.
Test: Our Universe- 2 - Question 7

Who proved that sun is at the center of the solar system?

Detailed Solution for Test: Our Universe- 2 - Question 7
  • All these scientists came together to form a new model.
  • They had to face immense criticism for proposing this theory that sun is at the center of the universe, because earlier it was believed that earth is the center of the solar system.
  • However, with their experiments these scientists proved that sun is at the center of the solar system.
Test: Our Universe- 2 - Question 8

Why earth is called the blue planet?

Detailed Solution for Test: Our Universe- 2 - Question 8
  • 70% of its surface is covered by water, so earth is also known as watery planet.
  • Also the earth's atmosphere scatters the light and creates the blue effect.
Test: Our Universe- 2 - Question 9

Why do astronauts wear oxygen mask on moon?

Detailed Solution for Test: Our Universe- 2 - Question 9

There is no atmosphere or air on moon. Therefore, without oxygen mask it would be impossible to breathe on moon.

Test: Our Universe- 2 - Question 10

Why does the moon change its shape every night?

Detailed Solution for Test: Our Universe- 2 - Question 10
  • Moon doesn't change its shape.
  • The part of the moon on which the shadow of the Earth falls, remains away from the sunlight and thus it doesn't appear at all.
  • As the Earth, the Sun and the Moon constantly revolve, the part of the Moon away from the sunlight increases or decreases.
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