universe & solar system section 6 Practice Questions Answers Test with Solutions & More Shortcuts
Universe, solar system and Astronomy PRACTICE TEST [13 - EXERCISES]
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Question : 16
Consider the following pairs:
- Electromagnetic radiation
- Geothermal energy
- Gravitational force
- Plate movements
- Rotation of the earth
- Revolution of the earth.
a) 2, 4, 5 and 6 only
b) 1, 2, 3, 4, 5 and 6
c) 1, 3, 5 and 6 only
d) 1, 2, 3 and 4 only
Answer »Answer: (b)
From electromagnetic radiation to the revolution of the earth, everything is responsible for bringing dynamic changes on the surface of the earth. For example,
Electromagnetic radiation brings changes in the field of microwaves, wavelengths of radio, UV rays, infrared rays, X rays, and gamma rays.
Geothermal energy is the heat received from the earth’s core. This heat continuously flows outward. It transfers to the surrounding layers of rock, the mantle. When temperature and pressure become very high some mantle rocks melt becoming magma. It then either comes out as lava or heats up the nearby rocks and water which comes out as hot springs or geysers.
Gravitational force is constantly working on all physical bodies. It is giving weights to objects with mass and causes them to fall to the ground when dropped. Plate movement is a dynamic change on the surface of the earth. It explains many aspects of the interrelationship of volcanoes, earthquakes, climate change, and the evolution of life itself.
Everything about our planet is related either directly or indirectly to plate tectonics. Rotation causes day and night. Revolution causes seasons, change in the length of day and night.
Question : 17
Consider the following statements
- The Earth does not move along its orbit at a constant rate.
- The Earth moves fastest at perihelion and slowest at aphelion.
a) Ohm’s law
b) Newton’s law of gravitation
c) Newton’s second law of motion
d) Kepler’s second law
Answer »Answer: (d)
Kepler’s second law of planetary motion describes the speed of a planet traveling in an elliptical orbit around the sun. It states that a line between the sun and the planet sweeps equal areas in equal times.
Thus, the speed of the planet increases as it nears the sun and decreases as it recedes from the sun.
Question : 18
Which one of the following statements is correct with reference to our solar system?
a) The Sun contains 75 percent of the mass of the solar system.
b) The diameter of the sun is 190 times that of the Earth.
c) The predominant element in the composition of Earth is silicon.
d) The earth is the densest of all the planets in our solar system.
Answer »Answer: (c)
The Earth is the densest of all the planets in our solar system. The density of the Earth is 5.513 g/cm3. This is an average of all of the material on the planet.
Question : 19
Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of universe?
- Detection of microwaves in space.
- Observation of redshift phenomenon in space.
- Movement of asteroids in space.
- Occurrence of supernova explosions in space.
a) 1, 3 and 4
b) None of the above can be cited as evidence
c) 2 only
d) 1 and 2
Answer »Answer: (d)
Only 1st and 2nd are correct.
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Universe, solar system and Astronomy Shortcuts »
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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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