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Subject:

science-physics

Class:

class VIII

Key Concepts

artificial satellites, asteroids, cassiopeia, celestial objects, comets, constellations, light year, meteorites, meteors, natural satellite, orbit, orion, phases of moon, planets, pole star remote sensing, solar system, stars, ursa major

essential questions

What are the characteristics of galaxies, and how does Earth compare to other planets in our solar system?

Remembering:

  1. Define celestial objects. Give examples.
  2. Name the two nearest star to the Earth.
  3. Name a constellation that is visible in winters.
  4. Name the constellation that is not visible from some parts of Southern Hemisphere
  5. Name the constellation in which Sirius star is present.
  6. What are stars mainly made up of: a) oxygen and hydrogen   b)  oxygen and mitrogen   c) hydrogen and helium   d) Water and helium
  7. Which of the following statements is correct about galaxies: a) they move towards each other   b) they move away from each other  c)  do not move at all  d) have a fixed number of stars
  8. Which of the following planets takes the maximum time to rotate around itself: a) mercury   b) venus  c) pluto  d) earth
  9. Which is the nearest galaxy to our galaxy: a) akash ganga   b) X31   c) andromeda   d) none of these
  10. The diameter of the moon is ___ that of the earth. a) 1/2   b) 1/3   c) 1/4  d) 2/3
  11. The moon moves around the earth in about __ days: a) 29    b) 28   c) 27   d) 26
  12. The moon takes__days to complete one spin. a) 25   b) 29   c) 27  d) 28
  13. The majority of asteroids are found between the orbits of: a) mars and jupiter   b) earth and mars  c)  jupiter and saturn   d) saturn and uranus
  14. Which is the brightest star in the sky: a) Cassiopeia   b) Sirus   c) Orion   d) none

understanding:

  1. Explain how does the phases of the moon occur.
  2. Describe the moon’s surface and its atmosphere.
  3. How do we calculate distance in space?
  4. What are constellations?
  5. Write a short note on Ursa Major and Orion.
  6. Explain how planets revolve around the sun.
  7. What is the difference between satellite and artificial satellite
  8. Why Earth is considered a special planet? Explain in detail.
  9. Write the difference between a) Asteroids and Comets  b) meteorite and meteor
  10. What do you understand by remote sensing satellite?
  11. What makes the live telecast of a cricket match: a) geostationary satellite   b)  polar satellite  c) low earth orbiting satellite  d) sun -synchronous satellite

Application:

  1. Why is moon known as a natural satellite?
  2. Why does sun appear to be so large as compared to other stars?
  3. Why does the sun appear to rise from the east and set in the west? Explain the phenomenon
  4. Why is pole star considered to be the star that gives us the direction in case we don’t have any way of finding direction?
  5.  Is it correct to say earth is satellite of Sun? Give reasons
  6. Why is Jupiter known as a gas planet? Give a valid reason.
  7. Why does pole star appear to be stationery in all seasons: a) does not rotate on its axis   b) happens to lie on the axis of equator  c) happens to lie above the axis of north pole of the earth  d) it is the most distant of all stars

Analysis:

  1. We always see one side of the moon. Can you think why we cannot see the other side of the moon?
  2. Do you think it is possible to talk on moon? Give reasons for your answer
  3. Explain why some planets take less than 1 earth year and some take more than 1 earth year to revolve around the sun.
  4. Mercury is closer to the sun than Venus. But Venus is hotter than Mercury. Give reasons.  a) mercury has no atmosphere and Venus has thick atmosphere which can retain the heat   b) mercury is mostly made up of sedimentary rocks while Venus contains igneous rocks   c) the sun absorbs the heat of the Mercury as it is closer to the sun   d) all of the above
  5.  Statement 1: The seasons happen on as the Sun’s position from the Earth keeps changing. Statement 2: The equatorial plane of the earth is at 0º. a) Both statement 1 and 2 are true   b) Both statement 1 and 2 are false   c) Only 1 is true  and 2 is incorrect   d) Only 2 is correct and 1 is incorrect
  6. Statement 1: Orbital plane and equatorial plane are inclined to each other at an angle of 23.5°.
  7. Statement 2: We can say that this inclination is also called as the tropic of cancer and tropic of Capricorn. a) Both statement 1 and 2 are true   b) Both statement 1 and 2 are false   c) Only 1 is true  and 2 is incorrect   d) Only 2 is correct and 1 is incorrect
  8. Choose the odd one out:

1. a) Sirus  b) Orion   c) Cassiopeia  d) Ursa Major

2. a) Hailey  b) EDUSAT   c) Kalpana-I  d) IRS

3. a) Neptune   b) Venus  c) Mars  d) Mercury

 

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