Samacheer Kalvi 8th Science Book Back Answers Chapter 8

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Samacheer Kalvi 8th Science Book Back Question and Answers:

Samacheer Kalvi 8th Standard Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 8 New Syllabus 2022 to 2023 Book Back Questions & Answers/solutions available for both English and Tamil Medium. Class 8 std Science Book Chapter 8 – Universe and Space Science Answers/Solutions Guide are uploaded on this page. 8th standard Science Book is consists of 23 Units. All 23 chapters of Science Book Back One, and Two Mark Solutions are given below.

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8th Science Book Back Chapter 8 Solutions Guide PDF:

Samacheer Kalvi 8th Science Subject 1 Mark and 2 Mark Solutions Guide 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.

8th Science Chapter – 8

Universe and Space Science – Book Back Answers

 

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.

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