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Geography Answer in brief

Tides · Maharashtra Board STD 7 (MSBSHSE - English Medium). 5 questions.

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5 questions · timed · auto-graded

Question 12 Marks
Can you tell:

Answer the following of questions with the help of figure
Image

(1) How do the tides occur?
(2) Which force is applied when the moon is closer to the earth?
(3) If it is high tide those having high tide at 0° and 180° meridian then at which meridians will low tide occur?

Answer
(1) Tides occur due to the relative positions of the moon, the sun, and the earth.
(2) Gravitational force becomes more effective than that of the sun when the moon is closer to the earth.
(3) The meridians that are at right angle to those having high tide will experience low tide at the same time ie. at 90°E & 90°W.
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Question 22 Marks
Explain the reasons for the generation of waves.
Answer
  • The main reason of wave generation is the force of the wind i.e. water appears to be moving.
  • But at times waves get generated due to earthquake or volcanic eruptions occurring below the floor of the sea.
  • Large or small waves are formed continuously at the surface of the sea.
  • Generation of waves is a natural and regular phenomenon.
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Question 32 Marks
If at Mumbai (73° E meridian), there is high tide at 1.00 pm on Thursday, then on which other meridian will there be a high tide too? State with reasons.
Answer
The other meridian which will experience high tide will be 107°W (180°-73°) because it is exactly 180° opposite from 73°E.
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Question 42 Marks
If there is high tide at 7 am, find the timings of the next high and low tides on the same day at a given place.
Answer
  • There is high tide & low tide twice a day i.e. in 24 hours.
  • One cycle of high tide & low tide is completed after every 12 hours & 25 minutes.
  • If there is a high tide at 7 am, the next low tide will be at 1.12 pm (after 6 hrs & 12 min.) & the next high tide will be at 7.25 pm (after 12 hrs & 25 min.)
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Question 52 Marks
Which factors are responsible for the occurrence of tides?
Answer
The following factors are responsible for the occurrence of tides.
  • The gravitational pull of the moon and the sun as well as that of the earth.
  • Revolution of the earth around the sun and the indirect revolution of the moon around the sun.
  • Centrifugal force generated due to the rotation of the earth.
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