IDAT Global Knowledge and Science 2 — Questions and Answers
Question 1: Which layer of Earth's atmosphere contains the ozone layer that absorbs ultraviolet radiation?
- Troposphere
- Stratosphere (Correct answer)
- Mesosphere
- Thermosphere
Correct answer: Stratosphere
The ozone layer is located in the stratosphere, roughly 15–35 km above Earth's surface.
Question 2: The Coriolis effect causes winds in the Northern Hemisphere to deflect in which direction?
- Southward
- Northward
- To the right (Correct answer)
- To the left
Correct answer: To the right
Earth's rotation deflects moving air to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
Question 3: Which international agreement, adopted in 2015, set targets for limiting global temperature rise to 1.5–2°C above pre-industrial levels?
- Kyoto Protocol
- Montreal Protocol
- Paris Agreement (Correct answer)
- Copenhagen Accord
Correct answer: Paris Agreement
The Paris Agreement was adopted at COP21 in 2015 and established the 1.5–2°C temperature target.
Question 4: What is the primary cause of ocean acidification observed over recent decades?
- Increased methane emissions
- Absorption of excess atmospheric CO₂ (Correct answer)
- Runoff of agricultural fertilizers
- Warming of deep ocean currents
Correct answer: Absorption of excess atmospheric CO₂
Oceans absorb about 30% of atmospheric CO₂, which reacts with seawater to form carbonic acid, lowering pH.
Question 5: Which branch of science studies the interactions between organisms and their environments?
- Taxonomy
- Ecology (Correct answer)
- Physiology
- Genetics
Correct answer: Ecology
Ecology examines how living organisms interact with each other and with abiotic factors in their environment.
Question 6: The United Nations was founded in 1945 primarily to replace which earlier international organization?
- The League of Nations (Correct answer)
- The Commonwealth of Nations
- The Concert of Europe
- The Non-Aligned Movement
Correct answer: The League of Nations
The UN succeeded the League of Nations, which had failed to prevent World War II.
Question 7: In chemistry, which type of bond involves the sharing of electron pairs between atoms?
- Ionic bond
- Hydrogen bond
- Covalent bond (Correct answer)
- Metallic bond
Correct answer: Covalent bond
Covalent bonds form when two atoms share one or more pairs of electrons rather than transferring them.
IDAT Global Knowledge and Science 2
Which layer of Earth's atmosphere contains the ozone layer that absorbs ultraviolet radiation?