All Free Everyday Science MCQs with Answers

731. A state of stress caused by concern for the earth's environment is called?

• A. Eco-anxiety
• B. Eco-fear
• C. Eco-depression
• D. Eco-alarm

Explanation: Eco-anxiety is persistent worry or distress about environmental damage and climate change. The other terms are not the established name for this condition.

732. The cause for the Tsunami, as deduced by the seismologists, is?

• A. gravitational pull of the moon
• B. low pressure trough in the ocean
• C. deformation of sea floor and vertical displacement of water
• D. sudden change in the monsoon wind

Explanation: Most tsunamis begin when an undersea earthquake suddenly deforms the seabed and vertically displaces the overlying water. Tides, pressure troughs and monsoon winds do not normally produce tsunami waves.

733. Which ocean is called "Ring of Fire"?

• A. Indian Ocean
• B. Pacific Ocean
• C. Atlantic Ocean
• D. Antarctic Ocean

Explanation: The Pacific Ocean is surrounded by a zone of frequent earthquakes and volcanic eruptions called the Pacific Ring of Fire. The other oceans do not have an equivalent continuous belt of activity.

734. Which of the following is called smallest, shallowest and coldest ocean of the world?

• A. Pacific Ocean
• B. Indian Ocean
• C. Arctic Ocean
• D. None of the above

Explanation: The Arctic Ocean is the smallest, shallowest, and coldest of the five major oceans. Its location around the North Pole keeps much of it covered by sea ice.

735. Which of the following ocean is the least polluted ocean of the world?

• A. Arctic Ocean
• B. Indian Ocean
• C. South Pacific
• D. None of the above

Explanation: The South Pacific is commonly cited in general-knowledge sources as among the least polluted ocean regions because it is remote from major industrial and population centres. Pollution rankings can vary depending on whether plastics, chemicals, or overall contamination is measured.

736. Which of the following ocean is the most polluted ocean of the world?

• A. Indian Ocean
• B. North Pacific Ocean
• C. Arctic Ocean
• D. None of the above

Explanation: The North Pacific is often identified in general-knowledge questions as the most polluted ocean region, partly because it contains the Great Pacific Garbage Patch and receives heavy shipping and coastal inputs. The exact ranking depends on the type of pollution measured.

737. Smallest animal is _________?

• A. Skunk
• B. Gorilla
• C. Tiger
• D. Cat

Explanation: Among the animals listed, the skunk is generally the smallest in body size; gorillas and tigers are much larger, and ordinary cats are usually heavier. The question is asking for the smallest listed animal, not the smallest animal species overall.

738. Which of the following ocean is the warmest ocean of the world?

• A. Indian Ocean
• B. Arctic Ocean
• C. North Pacific Ocean
• D. None of the above

Explanation: The Indian Ocean is generally the warmest ocean because much of it lies in the tropics and it has limited exchange with cold polar waters. The Arctic Ocean is the coldest, while the Pacific has a wider temperature range.

739. Which is the most abundant element in the atmosphere?

• A. Nitrogen
• B. Hydrogen
• C. Nickle
• D. Oxygen

Explanation: Nitrogen makes up about 78% of Earth's atmosphere by volume, far more than oxygen at about 21%. Hydrogen and nickel occur only in trace amounts in air.

740. Instrument of rain gauge is _________?

• A. Drosometer
• B. Ombrometer
• C. Micrometer
• D. Pyrometer

Explanation: An ombrometer, also called a rain gauge or pluviometer, measures the amount of rainfall received at a location. A pyrometer measures high temperature, while a micrometer measures very small lengths.