Our Solar System Class 5 DAV Solutions

A. Fill in the blanks:

1. Question: The earth is sometimes known as the __________ planet.

Answer: The earth is sometimes known as the blue planet.

2. Question: The earth completes one rotation about its axis in __________ hours.

Answer: The earth completes one rotation about its axis in 24 hours.

3. Question: The main members of the solar system are the sun and __________.

Answer: The main members of the solar system are the sun and 8 planets.

4. Question: The sun is a huge source of __________ and __________.

Answer: The sun is a huge source of heat and light.

5. Question: Day and night occur on earth due to its __________ about its own axis.

Answer: Day and night occur on earth due to its rotation about its own axis.

B. Match the following:

Question: Match the following:

1. the ringed planet — Saturn

2. the largest planet — Jupiter

3. a natural satellite — Moon

4. the windy planet — Neptune

5. the smallest planet — Mercury

C. Tick (✔) the correct option:

1. Question: The number of planets in our solar system is—

Answer: (b) eight

2. Question: The planet which reflects a large amount of sunlight falling on it is—

Answer: (d) Venus

3. Question: The planet Uranus is also known as a—

Answer: (a) windy planet

4. Question: The correct statement about the atmosphere is—

Answer: (a) Venus has mostly carbon dioxide around it.

5. Question: The fourth and the sixth planets of the solar system are—

Answer: (b) Mars and Saturn

6. Question: The statements that are correct about the moon are—

Answer: (d) A and C

7. Question: The first Indian satellite is—

Answer: (b) Aryabhatta

D. Answer the following questions in brief:

1. Question: Name the hottest planet in our solar system. Is it closest to the Sun?

Answer: Venus is the hottest planet in our solar system. No, it is not the closest to the Sun.

2. Question: How much time does the earth take to:

(i) revolve once around the Sun?

(ii) complete one rotation about its own axis?

Answer:

(i) The earth takes 365¼ days to revolve around the Sun.

(ii) The earth takes 24 hours to complete one rotation.

3. Question: State the nature of the shape of the orbit of planets.

Answer: The orbit of planets is elliptical in shape.

4. Question: Write the meaning of the term “Artificial Satellites”.

Answer: Artificial satellites are man-made objects sent into space to revolve around the Earth.

E. Answer the following questions

1. Question: How is the sun useful to us?

Answer: The sun provides heat and light and helps in the growth of plants and survival of life on Earth.

2. Question: Name the terrestrial planets. Why are they so called?

Answer: Mercury, Venus, Earth, and Mars are terrestrial planets. They are so called because they are rocky and solid.

3. Question: State the conditions necessary for existence of life on a planet.

Answer: Air, water, suitable temperature, and sunlight are necessary for the existence of life.

4. Question: Why do we observe phases of the moon?

Answer: We observe phases of the moon because it revolves around the Earth and reflects sunlight.

5. Question: State two uses of artificial satellites.

Answer:

1. Communication

2. Weather forecasting