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std-v, Unit-5 : universe: a great wonder, 1. Name the family in which earth is a member?, A. Solar system, Lis situated at the centre of solar system?, 2., A. Sun, 3.What is meant by the term planets?, A. The celestial bodies that rotate themselves while revolving around the sun are called planets., 4. Name the eight planets in the solar system?, A. Mercury, Venus, Earth, Mars ,Jupiter ,Saturn, Uranus, Neptune., 5. What is called orbit?, A. The path of a planet around the Sun is called orbit., 6.what is called a satellite?, A. Satellites are celestial bodies that revolve around the planets .moon is the satellite of Earth., 7. What you mean by the term stars?, A. Stars are gaint celestialbodies that burn by themselves. Stars emit heat and light in large, quantities., 8. Name the person who announced that the sun is the centre of the solar system.?, A. Copernicus, 9. Planets in the solar system, a. Neptune, More than a dozen satellites, 164 years to revolve around the sun., b. Saturn, Nolt has rings around, More than 30 satellite, c. Uranus, More than 25 satellites, 84 years to revolve around the sun, d. Jupiter, Biggest planet, More than 60 satellites, 12 years to revolve around the sun, e.Mercury, No satellites, Smallest planet, f. Venus, Brightest planet, Hottest planet, No satellite, g. Earth, Blue in colour when viewed from space, The only planet where life is found to exist, 1 satellite-moon, The only planet which has the atmosphere in it., h. Mars, Two satellites, Traces of water flow in ancient times discovered

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10. Who invented telescope?, A. Galileo Galilei (discovered four satellites of Jupiter also), 11. What is called asteroids?, A. The Rock fragments revolving around the sun in between Mars and Jupiter are the asteroids, .on rare occasions they come towards the earth and pose a threat to the earth., 12. In which year the international astronomical union declared Pluto as a dwarf planet-2006, 13. Name the satellite of Pluto?, A. Charon, 14 the only rolling planet in the solar system?, A. Uranus, 15 name the planet in which sun rises in the west?, A. Venus, 16. In the moon ----are visible during day time also?, A star, 17.What is mean by dwarf planets?, A. For a celestial body to be considered as a dwarf planet, it should have spherical shape, revolve, around the sun, and should have its own obstacle free orbit. The celestial bodies which do not, follow these conditions set by international astronomical union (IAU)are called dwarf planets., 18 What you mean by the term comets?, A. Comets are rare visited to the solar system. They are lumps of cosmic dust and snow, particles. Their tail is formed as they approach the sun and it glows in the sunlight. Though they, revolve around the sun, they come close to the sun very rarely. The length and the brightness of, the comets tale increase's as it approaches the sun. It rushed towards the sun and will never, return.eg:ISON,HALLY'S COMETS etc, 19. What is called meteoroids?, A. Rock fragments of various sizes which enter into the earth's atmosphere are called, meteoroids. they burn due to friction with air on entering into the atmosphere., 20 what is called meteorites?, A. The unburn remains of the meteors falling on the earth are called meteorites., 21. List out the members of a solar system, A. Sun, planets,Satellites, asteroids, Dwarfplanets, comets, meteoroids, 22.The Earth is the only planet where life is found to exist.explain its reasons?, The only planet with the atmosphere on it, Oxygen and carbon dioxide in the atmosphere are very essential for the survival of plants, and animals on earth., It is the atmosphere which protects the Earth from the meteoroids shower, Vast expanse of surface water reserveexist only on the earth., Two third( %)of the Earth's surface is covered with water so that from the space the, earth is viewed as blue in colour., Water, fertile soil , moderate heat and cold, atmosphere all creates favourable condition, for life exist only in earth., 23. What is a galaxy?, A.crores of stars make a galaxy., 24. What is called the Milky way?, A. The galaxy which includes the solar system is the Milky way. it is also known as, "akashaGanga"., 25. _includes millions of galaxies?

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A. Universe, 26. The only star in the solar system?, A.sun