universe & solar system section 12 Practice Questions Answers Test with Solutions & More Shortcuts
Universe, solar system and Astronomy PRACTICE TEST [13 - EXERCISES]
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Question : 14
The tail of a comet is directed away from the sun because
a) The radiation emitted by the sun exerts a radial pressure on the comet throwing its tail away from the Sun.
b) The tail of the comet always exists in the same orientation.
c) the comet rotates, the lighter mass of the comet is attracted by some star situated in the direction of its tail.
d) the comet rotates around the sun, the lighter mass of the comet is pushed away due to the centrifugal force alone.
Answer »Answer: (d)
Because of the comet rotation around the sun, the lighter mass of the comet is pushed away due to the centrifugal force alone. When a comet comes close enough to the sun, the ice begins to melt at such a great pace that sublimation occurs.
The sublimation of the ice that carries away dirt and rock causes the appearance of a large white fireball with a long tail. The layer that envelopes the comet is called the coma. A tail of dust particles, hydrogen, or ions extends more than a million miles away from the comet.
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indian geography mcq CATEGORIES
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» Nature & Scope of Geography
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» Universe, solar system and Astronomy
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» Geomorphology & Earth landforms
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» Atmosphere & Climatology
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» Hydrosphere & Oceanography
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» Pedology or Soil & Agriculture
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» Ecology & Bio geography
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» World Physical Geography
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» World Human Geography (Population)
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» World Economic Geography (Industry, Trade, Transportation & Agriculture)
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» World Country, Capital, Area, Currency, Parliament, Religion, New & old name of country
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» Physiography & Geomorphology of India
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» Indian Drainage, Irrigation and Rivers & River Projects
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» Indian Climate
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» Ecology, Environment, Forest, Naturals vegetations of India & National Park of India
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» Indian Agriculture & Animal Husbandry
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» Minerals & Energy Resources of India
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» Industries & Trade in India
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» Transportation & Ports System of India
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