DAV Class 5 Science Solution | Chapter 11 Our Solar System

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Chapter 11 Our Solar System DAV Class 5 Science Solution

SOMETHING TO KNOW

A. Fill in the blanks.

1. The earth is sometimes known as the blue planet.

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

3. The main members of the solar system are the sun and eight planets.

4. The sun is a huge source of heat and light.

5. Day and night occur on earth due to its rotation about its axis.

B. Match the following

Column I	Column II (Answer)
1. the ringed planet	(e) Saturn
2. the largest planet	(c) Jupiter
3. a natural satellite	(d) Moon
4. the windy planet	(b) Neptune
5. the smallest planet	(a) Mercury

C. Tick (✓) the correct option.

1. The number of planets, in our solar system, is

(a) seven (b) eight (c) nine (d) ten

Ans 1. (b) eight

2. The planet, which reflects a large amount of sunlight falling on it, is

(a) Mercury (b) Mars (c) Earth (d) Venus

Ans 2. (d) Venus

3. The planet Uranus is also known as a

(a) windy planet (b) terrestrial planet (c) jovian planet (d) red planet

Ans 3. (c) jovian planet

4. The correct statement, about the atmosphere of the planet named in it, is

(a) Venus has mostly carbon dioxide around it

(b) Mercury has mostly nitrogen around it

(c) Saturn has mostly helium around it

(d) Earth has mostly ozone around it

Ans 4. (a) Venus has mostly carbon dioxide around it

5. The fourth and the sixth planets, of the solar system are, respectively

(a) Jupiter and Uranus (b) Mars and Saturn

(c) Uranus and Jupiter (d) Neptune and Saturn

Ans 5. (b) Mars and Saturn

6. Consider the following statements about the Earth’s moon:

A. The moon is Earth’s natural satellite

B. We can see a full moon after every 15 days

C. The moon is a non-luminous object

D. The moon takes nearly 18 days to complete one revolution around the earth

The statements, that are correct, are the statements:

(a) A and B (b) B and D

(c) B and C (d) A and C

Ans 6. (d) A and C

7. The first Indian satellite is

(a) Kalpana-1 (b) Aryabhatta (c) INSAT (d) EDUSAT

Ans 7. (b) Aryabhatta.

D. Answer the following questions in brief.

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

Ans 1. Venus is the hottest planet in our solar system. It is not the closest planet to the sun.

2. How much time does the earth take to

(a) revolve around the sun?

Ans 2(a). About 365 days

(b) to complete one rotation about its own axis?

Ans 2(b). 24 hours

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

Ans 3. The shape of orbit of planets is elliptical.

4. Write the meaning of the term ‘Artificial Satellites’.

Ans 4. Man-made satellites are called artificial satellites.

E. Answer the following questions.

1. How is the sun useful to us?

Ans 1. The sun is the main source of energy for the earth. Plants need sunlight to make food. All animals directly or indirectly take food from plants. Thus, all living beings take energy from the sun. Thus, sun is necessary to sustain life on the earth.

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

Ans 2. Mercury, Venus, Earth and Mars are the terrestrial planets. These planets are mainly made up of rocks and metals and hence are called terrestrial planets.

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

Ans 3. Following are the necessary conditions for existence of life on a planet:

• Presence of atmosphere.

• Presence of liquid water on its surface.

• Right size and right distance from the sun; making it neither too hot nor too cold.

4. Why do we observe phases of moon?

Ans 4. Only one face of moon is visible from the earth because it takes the same number of days to complete one rotation and one revolution. Due to this, we get to see different shapes of moon on different days of the month. These shapes are called the phases of the moon.

5. State two uses to which artificial satellites are being put.

Ans 5. Two uses of artificial satellites:

• For transmission of radio and TV signals.

• For weather forecasting and remote sensing.

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