Class 8 Science Our Universe
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Exercise
Fill in the Blanks
1) Stars, planets, satellites, comets, etc. are examples of _______________
2) The moon is the only _____________ satellite of the earth
3) There is ____________ atmosphere on the moon
4) On _____________ day, no moon is visible in the sky.
5) Within about a week from the new moon day; the moon appears as a _____________
6) The waxing phase of the moon is followed by the _________________ .
7) The periods of rotation and revolution are same in case of the _______________
8) Stars produce __________ and ________________
9) A light year is a distance travelled by light in a ———— year.
10) All the celestial bodies appear to move from ____________ to _______________ .
11) The pole star appears in the _______________ .
12) ______________ appears in the northern sky
13) _______________ is also called the Hunter.
14) The ______________ gas in the sun keeps on changing to helium gas and this process releases huge amount of energy
15) ____________ and ____________ do not have own satellites
16) _____________ is the smallest planet in the solar system and is nearest to the sun.
17) ———- is the nearest planet of the earth.
18) A major portion of the earth’s surface is covered with water and hence it appears _______from space
19) Mars appears red because of the presence of ____________ on its surface.
20) Saturn is famous for its ____________________
21) _____________ are made up of rocks, metallic minerals and some ice.
22) Halley’s Comet and Hale-Bopp are some of the famous ______________.
23) The distance of the sun from the earth is nearly _____________
24) Light takes about ______________ to travel from the sun to the earth
25) The sun rotates from west to east with a period of about ________________
26) The visible disc of the sun is called ________________
27) The layer just above the photosphere is called the ______________
28) The region beyond chromospheres is called ________________
29) The total energy emitted by a star in one second is called its _________________
30) Global Positioning System (GPS) works because of _____________ satellites
Answers:
1.celestial objects
2.natural
3. no
4.the new moon
5.semicircle
6.waning phase
7.moon
8.heat, light
9.one
10.east, west
11.northern sky
12.Ursa Major
13.Orion
14.hydrogen
15.Mercury, Venus
16.Mercury
17.venus
18.blue
19.iron oxide
20rings
21Asteroids
22.comets
23.1.5 x 108 km
24.8 minutes
25. 29 days
26. Photosphere
27.Chromospheres
28.corona
29.luminosity
30.communication
True/false
1) Within about 7 days from the new moon day; the moon appears as a circle with some portion cut off.
2) Within about 15 days from the new moon day; the moon appears as a complete circle.
3) We are able to see the full moon
4) The sun is the farthest star from us.
5) Sailors and travellers used the pole star to find way when they had to travel during night
6) A group of stars which resembles certain shape is called a constellation
7) The solar system is 4.6 billion years old.
8) Sun is mainly composed of hydrogen gas.
9) There are nine planets in the solar system
10) Jupiter has the minimum number of known satellites.
11) Venus is visible in the early evening during the summer months and in the early morning during winters.
12) Deimos and Phobos are the two natural satellites of mercury.
13) Jupiter is 1300 times the size of the earth.
14) The density of Saturn is so low that it can float on water.
15) The axis of Uranus is slightly tilted on its orbit.
16) The asteroid belt is present between the orbits of Mars and Venus.
17) Halley’s Comet appears after every 46 years.
18) A meteorite can cause huge damage to the earth like destroying a huge population of living beings.
19) Pole Star is a member of the solar system.
20) Mercury is the smallest planet of the solar system.
21) Uranus is the farthest planet in the solar system.
22) INSAT is an artificial satellite.
23) There are nine planets in the solar system.
24) Constellation Orion can be seen only with a telescope.
| 1. F | 2. T | 3. T |
| 4. F | 5. T | 6. T |
| 7. T | 8. T | 9. F |
| 10. F | 11. T | 12. F |
| 13. T | 14. T | 15. T |
| 16. F | 17. F | 18. T |
| 19. F | 20. T | 21. F |
| 22. T | 23. F | 24. F |
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