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.

📘 Awards and Honours MCQs
📘 Basic General Knowledge MCQs
📘 Biology MCQs
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📘 Chemistry MCQs
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📘 Indian Geography MCQs
📘 INTERNATIONAL AFFAIRS
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📘 World Geography MCQs
📘 World Organisations MCQs

1681. World Ozone day is

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A. March 16
B. June 5
C. September 16
D. November 16
✅ The correct answer is option C.
In 1994, the United Nations General Assembly proclaimed 16 September the International Day for the Preservation of the Ozone Layer, commemorating the date of the signing, in 1987, of the Montreal Protocol on Substances that Deplete the Ozone Layer.

1682. The pyramid of numbers is inverted in the case of

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A. parasitic food chain
B. Grassland ecosystem
C. Forest ecosystem
D. lake ecosystem
✅ The correct answer is option A.
Pyramid of number indicates the number of individuals at each trophic level. The pyramid of number is inverted in tree ecosystem. In this, the the first trophic level contains least number of trees. The insects feeding on primary producer occupy second trophic level.

1684. Which of the radioactive material is largely associated with bone cancer

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A. Radium-226
B. Thorium-232
C. Strontium-90
D. Iodine
✅ The correct answer is option C.
The harmful effects of strontium-90 are caused by the high energy effects of radiation. Since radioactive strontium is taken up into bone, the bone itself and nearby soft tissues may be damaged by radiation released over time.

1687. Carbon dioxide is called greenhouse gas because it is

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A. Transparent to sunlight but traps heat
B. Transparent to heat but traps sunlight
C. Used in green-house to increase plant growth
D. Transparent to both sunlight and heat
✅ The correct answer is option A.
Those gas molecules in the Earth’s atmosphere with three or more atoms are called “greenhouse gases” because they can capture outgoing infrared energy from the Earth, thereby warming the planet. The greenhouse gases include water vapor with three atoms (H2O), ozone (O3), carbon dioxide (CO2), and methane (CH4).

1688. Warming in the stratosphere is mainly caused by:

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A. Absorption of ultraviolet radiation by ozone
B. Release of latent heat energy during condensation
C. Chemical reactions between ozone and chlorofluorocarbons
D. Frictional heating caused by meteorites
✅ The correct answer is option A.
The Primary Cause of Global Warming is Ozone Depletion. Atmospheric temperature decreases with altitude in the troposphere and increases with altitude in the stratosphere.

1690. The pollutant that causes hole in the ozone layer is

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A. SF6
B. nitrousoxide
C. CFCs
D. PFCs
✅ The correct answer is option C.
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).