General Knowledge

Boost your exam preparation with the latest General Knowledge MCQs with answers and explanations. Our collection covers current affairs, world geography, history, Pakistan studies, sports, science, technology, and important international organizations. These General Knowledge multiple-choice questions are designed for students, job seekers, and competitive exam aspirants preparing for NTS, PPSC, FPSC, CSS, PMS, university entry tests, and recruitment exams. Practice online with updated General Knowledge MCQs to improve awareness, sharpen memory, and score higher in tests and interviews.

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1631. Complex interlinked food chains are called

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A. Food Web
B. Food net work
C. Trophiclevels
D. Food pyramid
✅ The correct answer is option A.
Complex interlinked food chain is called food web. The correct answer is food web. Food web is the complex of interlinked food chains in a particular ecosystem the channelizes the movement of energy from the one trophic level to the other trophic level of that ecosystem

1632. Many freshwater animals cannot live for long in sea water and vice versa mainly because of the

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A. Change in N levels
B. Change in the levels of thermal tolerance
C. Variations in light intensity
D. Osmotic problems
✅ The correct answer is option D.
In freshwater a fish is hypertonic to its environment, it means fish is saltier and water continuously moves into the fishes body via Osmosis. Hence Many freshwater animals cannot live for long in sea water and vice versa mainly because of Osmotic problems. So the correct answer is ‘Osmotic problems’.

1633. Acid is an example of _____________

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A. Corrosive waste
B. Infectious waste
C. Radioactive waste
D. Ignitable waste
✅ The correct answer is option A.
Acids are substances that give up Hydrogen ions in solution. Acids are corrosive to metals while releasing Hydrogen gas, have a pH between 0 and 6.9 and are sour to the taste. There are many common substances that are acids: lemon juice (citric acid), vinegar (acetic acid), stomach acid, and soda pop (carbonic acid).

1634. Lions are found in

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A. Western Ghats
B. Corbett National Park
C. Forests of Madhya Pradesh
D. Gir forests
✅ The correct answer is option D.
Nearly all wild lions live in sub-Saharan Africa, but one small population of Asiatic lions exists in India’s Gir Forest. Asiatic lions and African lions are subspecies of the same species. Asiatic lions once prowled from the Middle East to India.

1635. A river with high BOD value is

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A. highly polluted
B. highly clean
C. highly productive
D. none of these
✅ The correct answer is option A.
The river which has high level of BOD is indicative of high pollution in the river as the dissolved oxygen available in the water is being used by the bacterias, and this result in less oxygen available to fish and other aquatic beings. Nitrates and phosphates contribute to high level of BOD.

1636. The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere:

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A. Water vapor
B. Nitrous oxide
C. Carbon dioxide
D. Ozone
✅ The correct answer is option D.
Ozone absorbs ultraviolet radiation but lets other types of radiation, such as visible light, pass through. Molecules of ozone absorb ultraviolet radiation. The ozone gas throughout the stratosphere is called the ozone layer. It absorbs harmful ultraviolet radiation from the Sun.

1637. “Ozone Hole” is a _____________

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A. Hole in the atmosphere
B. Destruction of ozone layer
C. Hole in the hydrosphere
D. Hole in the troposphere
✅ The correct answer is option B.
The ozone hole is not technically a “hole” where no ozone is present, but is actually a region of exceptionally depleted ozone in the stratosphere over the Antarctic that happens at the beginning of Southern Hemisphere spring (August–October).

1638. If very cold air is brought indoors and warmed with no change in its moisture content, the saturation vapor pressure of this air will______ and the relative humidity of this air will_____ .

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A. Increase, increase
B. Decrease, decrease
C. Increase, decrease
D. Decrease, increase
✅ The correct answer is option C.
If very cold air is brought indoors and warmed with no change in its moisture content, the saturation vapour pressure of this air will increase and the relative humidity of this air will decrease.

1639. The World Wetlands Day is celebrated on ________

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A. February 02
B. February 28
C. June 05
D. March 21
✅ The correct answer is option A.
World Wetlands Day is celebrated every year on 2 February to raise global awareness about the value of wetlands for humanity and the planet. It also marks the adoption of the Ramsar Convention on Wetlands in 1971 in the Iranian city of Ramsar.

1640. Which gas is likely to be reduced in the atmosphere by deforestation?

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A. Carbon dioxide
B. Nitrogen
C. Oxygen
D. Sulphur dioxide
✅ The correct answer is option C.
Oxygen is the gas which is likely to be reduced in the atmosphere by deforestation. One of the most dangerous threats to life on earth is the increase in pollution which is caused because of the increase in the concentration of carbon dioxide and carbon monoxide in the environment.