Question

The tides in the seas are influenced both by the sun and the moon. This fact is proved by _______.
A. The spring and the neap tides.
B. The bores
C. Ebb tides
D. Oceanic currents

Answer 1

Hint: The vertical motion of the water in the oceans is due to the gravitational pull of the sun and the moon. Because of this pull the ocean water is raised up and falls down twice a day this is due to the gravitational pull of the moon.

Complete answer:
-Option A: The spring and the neap tides, The neap tides occur seven days after spring tides and they occur every month during the first and third quarter moon when the moon appears half. The sun and the moon are at right angles to each which produces moderate tides and in spring tides the gravitational pull of the sun is added to the gravitational pull of the moon resulting in a higher tide. They occur on new and full moons. Hence, this is the correct option.
-Option B: The bore is a phenomenon in which the leading edge of the tide that is incoming forms a wave of water that travels up to a river against the direction of the river’s current. Hence, this is an incorrect option.
-Option C: Ebb tide is a term used for the change from high tide to low tide and flood tide is the opposite of ebb tide which is from low tide to high tide. Hence, this is an incorrect option.
-Option D: Oceanic current is the continuous movement of water in the ocean or sea. It is generated because of a number of forces acting upon the water like temperature differences, Coriolis effect, breaking waves, and salinity difference. Hence, this is an incorrect option.

So, the correct answer is option A.

Note: The tidal force is caused due to the gravitational pull of the moon. The earth passes through two tidal bulges daily. When the region in which we are passing through the bulge there is a high tide and when it does not pass there is a low tide.