Available Answers

1. 1.

   Write true or false. Rewrite the false statements correctly.

   1. Kilometre is a convenient unit for measuring distances in the universe.
   2. The earth is the largest planet of the solar system.
   3. Mercury is seen in the sky just before the sunrise.
   4. The moon is not a luminous body.
   5. Orion is a member of the solar family.
   6. The sun is a glaring ball of gases, mostly hydrogen and helium.
   7. Ceres was the first asteroid discovered by an Italian scientist G. Piazzi.
   8. Meteors form craters on the surface of the earth.
   9. Ursa Major is a constellation.
   10. A comet's tail always points away from the sun.
2. 2.

   Fill in the blanks :

   1.  A group of stars forming a recognizable shape is known as ___________________.
   2.  The ___________________ is the star nearest to the earth.
   3. ___________________ is the only planet where life exists in our solar system.
   4. ___________________ are the building blocks of the universe.
   5. The temperature of the sun at its centre is ___________________ °C.
   6. ___________________ is one of the planet which rotates on its axis from east to west.
   7. ___________________ is a periodic comet.
   8. All stars except the ___________________ star appear to move from east to west.
   9. The moon is a celestial body that revolves around the ___________________.
   10. There are ___________________ constellations known so far.
3. 3.

   Tick the correct answer :

   (a) The branch of science that deals with the heavenly bodies is called

   1. Astrology
   2. Anatomy
   3. Biology
   4. Astronomy

   (b) Pole star belongs to the constellation

   1. Ursa Major
   2. Ursa Minor
   3. Orion
   4. Scorpio

   (c) The planet with rings around itself is

   1. Uranus
   2. Mercury
   3. Saturn
   4. Neptune

   (d) India's first satellite put in space was

   1. Bhaskara
   2. Aryabhatta
   3. Rohini
   4. INSAT-1A

   (e) An instrument used to observe heavenly bodies is called

   1. Telescope
   2. Camera
   3. Microscope
   4. Periscope

   (f) The planet farthest from the sun is

   1. Jupiter
   2. Neptune
   3. Mercury
   4. Saturn

   (g) The streak of light caused by heavenly bodies burning completely while moving through the atmosphere is of a

   1. a comet
   2. a meteor
   3. an asteroid
   4. a meteorite

   (h) Our solar system belongs to the

   1. Whirlpool galaxy
   2. Starburst galaxy
   3. Milky Way galaxy
   4. Radio galaxy

   (i) The time taken by light to reach from the sun to the earth is

   1. 6 minute 14 sec
   2. 8 minute 20 sec
   3. 20 minute 8 sec
   4. 14 minute 6 sec

   (j) The first satellite sent to space was

   1. Sputnik-I
   2. Aryabhatta
   3. Explorer
   4. INSAT-1A
4. 4.

   Match the following:

   Shooting star Constellation Brightest planet Artificial satellite Galaxy Periodic comet Natural satellite Star

   Halley Sun Meteors Venus INSAT-1A Milky way Ursa Major Moon

5. 5.

   Find the odd-one out. Give reasons.

   1. Orion, Scorpio, Ursa Major, Pole star
   2. Planet, Sun, Meteor, Comet
   3. Uranus, Moon. Mercury, Jupiter
   4. Uranus, Mars, Jupiter, Saturn
6. 6.

   What is the universe?