All questions of The Sun, Moon and Stars for Grade 1 Exam

The correct sentence is option 'B': "The Sun gives us light and heat."

Explanation:

The given sentence options are:

a) The Sun and the Moon give us light and heat.
b) The Sun gives us light and heat.
c) The Moon gives us light and heat.
d) All the stars give us light and heat.

1. Understanding the sentence options:

- Option 'a' states that both the Sun and the Moon give us light and heat.
- Option 'b' states that only the Sun gives us light and heat.
- Option 'c' states that only the Moon gives us light and heat.
- Option 'd' states that all the stars give us light and heat.

2. Analyzing the correct sentence:

The correct sentence is option 'B' because it accurately states that the Sun gives us light and heat.

3. Understanding the roles of the Sun, Moon, and stars:

- The Sun is a star that is closest to the Earth and is responsible for providing light and heat to our planet.
- The Moon is not a source of light or heat. It reflects the light of the Sun, which is why we see it shining in the night sky.
- Stars are distant celestial objects that emit their own light and heat, similar to the Sun. However, they are located far away from the Earth and do not directly provide light and heat to us.

4. Applying the correct sentence to the given information:

Since the Sun is the primary source of light and heat for Earth, option 'B' correctly states that the Sun gives us light and heat. The Moon only reflects the Sun's light, and stars are not mentioned in the sentence. Therefore, option 'B' is the correct sentence out of the given options.

Conclusion:

The correct sentence is option 'B': "The Sun gives us light and heat." This sentence accurately reflects the role of the Sun as the primary source of light and heat for Earth.

The Moon takes approximately 4 weeks to orbit the Earth. This is the correct answer because the Moon's orbital period, also known as its synodic period, is the time it takes for the Moon to complete one full orbit around the Earth and return to the same position relative to the Sun.

The Moon's orbit around the Earth is not a perfect circle, but rather an ellipse, with the Earth located at one of the foci of the ellipse. This means that the Moon's distance from the Earth varies throughout its orbit. However, on average, the Moon is about 384,400 kilometers away from the Earth.

The Moon's orbital period is determined by the gravitational pull of the Earth. The Earth's gravity keeps the Moon in its orbit and causes it to move in a circular path around the Earth. This means that the Moon is constantly being pulled toward the Earth, but its forward motion keeps it from falling into the Earth.

The Moon's orbital period is also influenced by the gravitational pull of the Sun. The Sun's gravity affects the Moon's orbit, causing it to deviate slightly from a perfect circle. This is why the Moon's orbit is an ellipse rather than a circle.

The Moon's synodic period of approximately 4 weeks is also the reason why we see different phases of the Moon throughout the month. As the Moon orbits the Earth, the Sun illuminates different portions of the Moon, resulting in the different phases we observe from Earth.

In conclusion, the Moon takes approximately 4 weeks to orbit the Earth. This is due to the combined gravitational forces of the Earth and the Sun, which keep the Moon in its elliptical orbit around the Earth.