# OCEANOGRAPHY 90 Important MCQS Part 6 FOR NTA UGC NET

OCEANOGRAPHY 90 Important MCQS Part 6 FOR NTA UGC NET

OCEANOGRAPHY 90 Important MCQS NTA UGC NET, OCEANOGRAPHY 90 MCQS PART 6, NTA UGC NET PYQS GEOGRAPHY, OCEANOGRAPHY 90 MCQS PART 6, GEOGRAPHY PYQS UGC NET, NTA UGC NET GEOGRAPHY PAPER WISE PYQS, PYQS FOR UGC NET GEOGRAPHY,

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Q.76. Name the place where tides occurs four time in a day

(A) Hammerfest Port (Norway)

(B) Southampton Port (South England)

(C) Vikshapatnam Port (India)

(D) Florida Coast (U.S.A)

Explanation:

Q.77. The vertical movement of cold water from deeper oceanic layers to replace warmer surface is called a

(A) Turbidity

(B) Emergence

(C) Upwelling

(D) Halocline

Explanation:

The vertical movement of cold water from deeper oceanic layers to replace warmer surface is called a Upwelling

Q.78. The mid-oceanic ridge extends

(A) 25,000 km

(B) 35,000 km

(C) 45,000 km

(D) 65,000 km

Explanation:

Q.79. Match List-I with List-II and select the correct answer from the given below

 List-I (Ocean Depths) List-II (Thermal Layers) A. 0-500 metres 1. Cold B. 500-1000 metres 2. Cool C. 1000-1500 metres 3. Warm D. > 1500 metres 4. Thermocline

Code:

 A B C D A. 1 2 3 4 B. 2 3 4 1 C. 3 4 2 1 D. 2 4 1 3

Explanation:

Q.80. Which of the following straits connects Black Sea and sea of Marmara

(A) Bering Strait

(B) Bosporus Strait

(C) Mallava Strait

(D) Palk Strait

Explanation:

Q.81. Which straits separates Red sea from Indian Ocean

(A) Gulf Strait

(B) Bab-el-Mandeb Strait

(C) Davis Strait

(D) Mallave Strait

Explanation:

Q.82. Which one of the following is the main chemical composition of coral reefs?

(A) Mg CO3 (Magnesium Carbonate)

(B) KCO3 (Potassium Carbonate)

(C) NaCl (Sodium Chloride)

(D) CaCO3 (Calcium Carbonate)

Explanation:

Q.83. Identify the correct sequence from land to sea.

(A) Swash-Breaker-Transition-Surf

(B) Swash-Transition-Breaker-Surf

(C) Swash-Transition-Surf-Breaker

(D) Breaker-Swash-Surf-Transition

Explanation:

Q.84. Which one of the following types of sea floor sediments includes calcareous and siliceous oozes?

(A) Fluvial

(B) Terrigenous

(C) Biogenous

(D) Hydrogenous

Explanation:

Q.85. Kayals (Back Water) are found in which state

(B) Rajasthan

(D) Kerala

Explanation:

The Kerala backwaters are a network of brackish lagoons and lakes lying parallel to the Arabian Sea coast (known as the Malabar Coast) of Kerala state in southern India,

Q.86. In 1687, who was the scientist to give for the first time a rational explanation of tides and tide producing forces of the moon and the sun?

(A) John Dalton

(B) Gregor Mendel

(C) Issac Newton

(D) Albert Einstein

Explanation:

Theories of the Origin of Tides

Equilibrium Theory – Issac Newton (1687)

Dynamic Theory – Laplace (1755)

Progress Theory – William Whewell (1833)

Canal Theory – G.B Airy (1842)

Stationary Wave Theory – R.A. harris (1904)

Q.87.  Coastal and estuary waters are sometimes affected by algal foam and scum, often called

(A) Red tides

(B) Red clay

(C) Red Soil

(D) Red waves

Explanation:

Algal bloom: Algal bloom refers to an increase in the population of algae and blue – green algae in water due to increase in nutrients like nitrogen and phosphorus there. This results in discoloration of the water body. This causes an increase in the biological oxygen demand (BOD), resulting in the death of fishes and other aquatic animals.

Red Tides: Red tides occurs when algae, plant like organisms that live in the waater grow out of control. The name “red tide” comes from the fact that overgrowth of algae can cause the color of the water to trun red, as well as green or brown.

Q.88. At which one of the following temperatures is fresh water densest?

(A) 0°C

(B) 4°C

(C) 100°C

(D) – 4°C

Q.89. The densest sea water is the

(A) Arctic bottom water

(B) North Pacific bottom water

(C) Antarctic bottom Water

(D) North Atlantic deep water

Q.90. A halocline refers to a significant change in

(A) Density

(B) Salinity

(C) Temperature

(D) Turbidity