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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1611. A smog that occurs due to low temperature and has reducing environment is

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A. los angeles smog
B. photochemical smog
C. london smog
D. greenland smog
✅ The correct answer is option C.
Hence, the smog that occurs due to low temperature i.e. in cold climate, and has reducing environment is classical smog or London smog. So, the correct answer is ‘London smog

1614. The earth’s radiative equilibrium temperature is:

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A. The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
B. The temperature at which the earth is radiating energy at maximum intensity
C. The average temperature the earth must maintain to prevent the oceans from freezing solid
D. The temperature at which rates of evaporation and condensation on the earth are in balance
✅ The correct answer is option A.
This is radiative equilibrium, energy balance. The temperature at which this occurs is about 0 F. That is called the temperature of radiative equilibrium. You might remember this is the figure for global annual average surface temperature on the earth without the greenhouse effect.

1615. The simplest aquatic ecosystem can be seen in a

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A. River
B. Lake
C. Pond
D. Water Tank
✅ The correct answer is option C.
Pond is the simplest aquatic ecosystems. Most ponds become dry after the rain over and are covered by terrestrial plants for the rest of the year. When the ponds fills in the monsoon season, a large number of food chains formed in the pond ecosystems.

1616. Which of the following is the best indicator of the actual amount of water vapour in the air?

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A. Air temperature
B. Saturation vapour pressure
C. Relative humidity
D. Dew point temperature
✅ The correct answer is option D.
Dew point is a good indicator of the air’s actual water vapour content, unlike relative humidity, which takes the air’s temperature into account. High dew point indicates high water vapour content; low dew point indicates low water vapour content.

1617. What is deforestation?

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A. Product of forest
B. destruction of forest
C. Forest Protection
D. None
✅ The correct answer is option B.
Deforestation, clearance, clearcutting or clearing is the removal of a forest or stand of trees from land which is then converted to a non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated deforestation occurs in tropical rainforests.

1618. Germ Layer includes

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A. mesoderm layer
B. ectoderm, mesoderm, endoderm
C. ectoderm
D. endoderm
✅ The correct answer is option B.
Germ layer, any of three primary cell layers, formed in the earliest stages of embryonic development, consisting of the endoderm (inner layer), the ectoderm (outer layer), and the mesoderm (middle layer).

1620. Frost forms when:

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A. Objects on the ground cool below the dew point temperature.
B. The dew point is 32oF or below.
C. Water vapor changes into ice without first becoming a liquid.
D. All of the above
✅ The correct answer is option D.
Frost forms when an outside surface cools past the dew point. The dew point is the point where the air gets so cold, the water vapour in the atmosphere turns into liquid.