Every question from this NCERT chapter, with a detailed explanation.
Consider the following factors: 1. The shape of bays and estuaries has no influence on the magnitude of tides. 2. Presence of wide continental shelves. 3. Presence of mid-oceanic islands. Which of the above factors can influence the height or magnitude of tidal bulges?
Which of the following best describes the general movement of warm ocean currents?
With reference to the movements of ocean water, consider the following statements: 1. Ocean currents represent the horizontal motion of water while tides represent the vertical motion. 2. In waves, the water moves ahead from one place to another along with the wave train. 3. The upwelling of cold water from the subsurface is a form of horizontal motion. Which of the statements given above is/are correct?
Consider the following statements regarding the characteristics of ocean waves: 1. The largest waves are typically found in open oceans rather than enclosed seas. 2. Steep waves are generally old and originate from far away places. 3. Slow and steady waves usually originate from far away places. Which of the statements given above is/are correct?
The maximum height of a wave is determined by which of the following factors? 1. The strength of the wind has no role in determining wave height. 2. The duration for which the wind blows. 3. The area over which the wind blows in a single direction. Select the correct answer using the code given below:
What is the primary reason for the reduction in wave speed as ocean waves approach the coast?
Consider the following statements regarding the generation of waves: 1. Waves lose energy and shrink as they move across the open ocean. 2. Most waves are caused by the wind driving against water. 3. Waves break when the water depth exceeds twice the wavelength. Which of the statements given above are correct?
With reference to the forces generating tides, consider the following statements: 1. The moon’s gravitational pull is the primary cause for the occurrence of tides. 2. Centrifugal force acts in the same direction as gravity. 3. On the side of the earth facing the moon, the gravitational attraction of the moon is greater than the centrifugal force. Which of the statements given above is/are correct?
With reference to the types of tides based on frequency, consider the following statements: 1. Semi-diurnal tides feature one high tide and one low tide each day. 2. Diurnal tides feature one high tide and one low tide each day. 3. Mixed tides generally occur along the east coast of North America. Which of the statements given above is/are correct?
Consider the following statements regarding Spring Tides: 1. They occur when the sun, the moon, and the earth are in a straight line. 2. They occur only once a month during the full moon period. 3. During spring tides, the tidal range is greater than normal. Which of the statements given above is/are correct?
Which of the following situations leads to the occurrence of 'Neap Tides'?
With reference to the variation in tidal heights due to orbital positions, consider the following statements: 1. When the moon is closest to the earth (perigee), tidal ranges are significantly lower than normal. 2. When the earth is farthest from the sun (aphelion), tidal ranges are much less than average. 3. The time between the high tide and low tide, when the water level is falling, is called the ebb. Which of the statements given above is/are correct?
Consider the following pairs regarding astronomical positions and their timing: 1. Perihelion : Around 3rd January 2. Aphelion : Around 4th July 3. Spring Tide interval : Twice a month 4. Neap Tide interval : Seven days after Spring Tide How many of the above pairs are correctly matched?
The highest tides in the world occur at which of the following locations?
Which of the following are the benefits or applications of tides? 1. Desilting sediments from river estuaries. 2. Removing polluted water from estuaries. 3. Generating electrical power. 4. Assisting navigation in harbours with shallow bars. Select the correct answer using the code given below:
With reference to Ocean Currents, consider the following statements: 1. They represent a regular volume of water in a definite path and direction. 2. Heating by solar energy is a secondary force that influences the currents. 3. Coriolis force is a primary force that initiates the movement of water. Which of the statements given above is/are correct?
Deep water currents make up what percentage of the ocean water?
In the context of oceanography, how does the Coriolis force influence the direction of moving ocean water?
With reference to the characteristics of ocean currents, consider the following statements: 1. The speed of a current is referred to as its "drift". 2. Currents are generally strongest at the bottom of the ocean. 3. Most currents have speeds generally less than 5 knots. Which of the statements given above is/are correct?
How do differences in water density affect the vertical mobility of ocean currents? 1. Water with high salinity is less dense than water with low salinity. 2. Cold water is denser than warm water. 3. Denser water tends to rise while lighter water tends to sink. Which of the statements given above is/are correct?
Consider the following statements regarding the classification of ocean currents based on depth: 1. Surface currents constitute about 90 % of all the water in the ocean. 2. Deep water currents move around ocean basins due to variations in density and gravity. 3. Deep waters rise to the surface at high latitudes due to thermal expansion. Which of the statements given above is/are correct?
In the context of the Northern Hemisphere, warm currents are typically found on the:
Consider the following statements regarding the influence of winds on ocean currents: 1. The oceanic circulation pattern roughly corresponds to the earth’s atmospheric circulation pattern. 2. In the middle latitudes, the air circulation over the oceans is mainly cyclonic. 3. In regions of pronounced monsoonal flow, the monsoon winds influence the current movements. Which of the statements given above is/are correct?
Which of the following surface features is primarily formed when a light breeze of two knots or less blows over calm ocean water?
Consider the following statements about the "Surf": 1. It is formed exclusively by local winds blowing near the shore. 2. It is the result of waves breaking and dissolving as they roll ashore. 3. It involves the forward movement of water onto the beach. Which of the statements given above is/are correct?
In oceanography, the size and shape of a wave are primarily indicative of its:
In the mechanism of wave propagation, what is the immediate result of falling water pushing the former troughs upward?
Which force is responsible for creating the second tidal bulge away from the moon?
Consider the following statements regarding the Bay of Fundy tides: 1. There is only one high tide and one low tide every day. 2. The tidal bulge is approximately 15-16 meters. 3. The tide rises about 10 cm an hour. Which of the statements given above are correct?
Which of the following represents the most common tidal pattern observed in the world's oceans?
Which of the following characterizes the frequency of high tides in a Diurnal tidal pattern within a 24-hour period?
In the low and middle latitudes, cold ocean currents are typically observed on the:
The variation in the height of high tides is primarily determined by:
During which phase do Spring Tides occur?
The interval between Spring tides and Neap tides is normally:
Consider the following statements regarding the Moon's gravitational force: 1. It is the only force responsible for tides. 2. It is more than twice as strong as the sun's gravitational pull on the earth. Which of the statements given above is/are correct?
Which term describes the phase of the tide when the water level is rising from low tide to high tide?
Ocean currents are functionally most similar to which of the following terrestrial features?
Near the equator, the ocean water level is approximately 8 cm higher than in the middle latitudes. What is the primary reason for this?
Which force is primarily responsible for the downslope movement of water accumulated by wind stress, thereby creating pressure gradients?
Consider the following statements regarding the speed of ocean currents: 1. A fast current is considered strong. 2. Currents at depths are generally fast with speeds exceeding 5 knots. 3. The strength of a current refers to its speed. Which of the statements given above are correct?
In the Northern Hemisphere, cold ocean currents are typically located on the east coasts of continents in:
Warm ocean currents are typically found along the east coasts of continents in which of the following latitudinal zones?
At higher latitudes, where the wind flow is mostly cyclonic, the oceanic circulation:
Due to the Coriolis force, warm currents from low latitudes tend to move:
What is the climatic impact of warm currents flowing parallel to the east coasts of continents in tropical and subtropical latitudes?
Areas lying in the western margins of the subtropical anti-cyclones are typically associated with:
Which of the following is a characteristic of the west coasts of continents in tropical and subtropical latitudes?
With reference to the movement of ocean water, consider the following statements: 1. Wind absorbs energy from the waves. 2. Wind causes waves to travel in the ocean. 3. Energy is released on shorelines. Which of the statements given above are correct?
Which of the following primarily represents the horizontal motion of ocean water?
Which term describes the phase of the tide when the water level is falling from high tide to low tide?
Which tidal pattern is characterized by two high tides and two low tides of approximately equal height each day?
Which one of the following is NOT a primary force initiating ocean currents?