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71. High spring tides occur at new Moon and full Moon because the
- A. Moon and Earth are at right angles
- B. Sun and Moon are at right angles
- C. Sun,Earth and the Moon are in straight line
- D. Sun and Earth are at right angles
- Check Answer | Discussion
72. Which one of the following is an object with such a strong gravitational field that even light cannot escape from its surface ?
73. If the Earth's axis were perpendicular to the plane of its orbit, which one among the following would not have happened?
- A. The North Pole will always lie in dark
- B. Days and nights would be equal throughout the year
- C. No change of seasons will take place
- D. The Sum will be perpendicular to the equator
- Check Answer | Discussion
74. Which one of the following statements is correct with reference to our solar system?
- A. The Earth is the densest of all the planets in our solar system
- B. The predominant element in the composition of Earth is silicon
- C. The Sun contains 75 percent of the mass of the solar system
- D. The diameter of the sun is 190 times that of the Earth
- Check Answer | Discussion
75. The surface of a lake is frozen in severe winter but the water at its bottom is still liquid. What is the reason?
- A. Ice is a conductor of heat
- B. Since the surface of the lake is at the same temperature as the air no heat is lost
- C. The density of water is maximum at 4°C
- D. None of the above
- Check Answer | Discussion
76. Identify the correct order of the process of soil erosion from the following
- A. splash erosion,sheet erosion,rill erosion,gully erosion
- B. sheet erosion,splash erosion,gully erosion,rill erosion
- C. rill erosion,gully erosion,sheet erosion,splash erosion
- D. gully erosion,rill erosion,sheet erosion,splash erosion
- Check Answer | Discussion
77. In the structure of planet Earth, the mantle, the core is mainly made up of which one of the following ?
78. Which of the following regions gets no rainfall throughout the year?
79. Rocks which are formed by the solidification of lava on the Earth's surface are
80. When it is 12:00 noon in Allahabad, the time in Tokyo would be about?
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