Samacheer Kalvi 8th Science Unit 8 Book Back Answers:

Samacheer Kalvi 8th Standard New Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 8 New Syllabus 2021 to 2022 Book Back Question & Answer available for both English and Tamil Mediums. Class 8th Science Book Unit 8 – Universe and Space Science Answers/Solutions are provided on this page. 8th Std Science Book consists of 23 units, All Science Book Back One, and Two Mark Solutions are given below.

Check Unit wise and  Samacheer Kalvi 8th Science Book Back Solutions Answers PDF format for Free Download. English, Tamil, Maths, Science, and Social Science Book Back Question and Answer is available in PDF. Class 8th Standard Science Book Back Answers PDF. Check Science book back Answers below. See below for the 8th New Science Syllabus Book Back guide/Answers free PDF download:

Samacheer Kalvi 8th Science Book Back Solutions PDF:

8th Science Subject 1 Mark and 2 Mark Solutions PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes. Samacheer Kalvi 8th Science Unit 8 Answers are given below.

Science Book Back Answers

Unit 8 – Universe and Space Science

I. Choose the best answer:

1. Which of the following is a celestial body?
(a) Sun
(b) Moon
(c)Stars
(d) All the above
Answer:
(d) All the above

2. Mangalyaan was sent to …………….
(a) Moon
(b) Mars
(c) Venus
(d) Mercury
Answer:
(b) Mars

3. Chandrayaan -1 was launched on …………….
(a) 22nd October 2008
(b) 8th November 2008
(c) 22nd July 2019
(d) 22nd October 2019
Answer:
(a) 22nd October 2008

4. ……………. is called as Red planet.
(a) Mercury
(b) Venus
(c) Earth
(d) Mars
Answer:
(d) Mars

5. Which of the following is the working principle of Rockets?
(a) Newton’s first law
(b) Newton’s second law
(c) Newton’s third law
(d) All the above
Answer:
(c) Newton’s third law

6. Cryogenic fuels are stored at …………….
(a) room temperature
(b) low temperature
(c) very low temperature
(d) very high temperature
Answer:
(c) very low temperature

7. ……………. was the first manned mission of NASA to go to the moon.
(a) Apollo-5
(b) Apollo-8
(c) Apollo-10
(d) Apollo-11
Answer:
(b) Apollo-8

II. Fill in the blanks:

1. The study about stars and planets are known as ……………
2. Our Sun belongs to …………… Galaxy.
3. Mars revolves around the Sun once in …………… days.
4. …………… is India’s first interplanetary mission.
5. …………… was the first man to walk on the surface of the Moon.

Answer:

1. Astronomy
2. Milky way
3. 687
4. Mars Orbiter Mission
5. Neil Armstrong

III. Say True or False. If false, correct the statement:

1. The Sun and the celestial bodies form Solar system.
Answer:
true

2. Chandrayaan-1 was launched from Sriharikota.
Answer:
True.

3. Mars is the smallest planet in the Solar system.
Answer:
False
Correct statement:
Mercury is the smallest planet in the Solar system.

4. PSLV and GSLV are India’s popular satellites.
Answer:
True.

5. The propellant of a rocket is only in the form of solids.
Answer:
False
Correct statement:
The propellant of a rocket is may be in the form of solids or liquids.

IV. Match the following:

1. Chandrayaan     – Fuel
2. Mangalyaan       – Moon
3. Cryogenic           – First manned mission to the moon
4. Apple – 8            – First man landing mission to the moon
5. Apollo-11             – Mars

Answer:

1 – 2; 2 – 5; 3 – 1; 4 – 3; 5 – 4

V. Answer briefly:

1. What are celestial objects?
Answer:
The stars, the planets, the Moon and any other objects like asteroids and comets in the sky are called celestial objects.

2. Define galaxy.
Answer:
A collection of billions of stars held together by mutual attraction is called galaxy.

3. What are the objectives of Chandrayaan-1?
Answer:

1. To find the possibility of water on the Moon.
2. To find the elements of matter on the Moon.
3. To search for the existence of Helium-3.
4. To make a 3-dimensional atlas of the Moon.
5. To study about the evolution of the solar system.

4. List out the objectives of Mangalyaan.
Answer:

1. To develop the technology required for interplanetary mission. .
2. To explore the surface of Mars.
3. To study the constituents of the Martian atmosphere.
4. To provide information about the future possibility of life and past existence of life

5. What are Cryogenic Fuels?
Answer:
Cryogenic fuels are the fuels used in rocket engine. They are maintained or stored at very low temperature in order to keep them in liquid state.

6. Name the Indians worked at NASA.
Answer:
Kalpana Chawla and Sunitha Williams.

Other Important links for 8th Science Book Back Answers:

Click here for Samacheer Kalvi 8th Science Book Back Solutions – 8th Science Book Back Answers