Question 1

1. If Earth has a total water volume of V, and only 2.7% is fresh water, of which 70% is trapped in ice sheets/glaciers, what percentage of V is actually accessible as liquid fresh water for human use?

A) 2.7%B) 1.89%C) Less than 1%D) 0.03%

Answer

✓ Correct Answer: Option C

Explanation: Solution: Total Fresh Water = 2.7% of V. Trapped water $= 70% of 2.7% = 0.70 \times 2.7 = 1.89%$. Accessible water = 2.7% - 1.89% = 0.81%.  Since 0.81% < 1%, the answer is C.

Question 2

2. A resource is classified as "Ubiquitous" if its spatial distribution function f(x,y) is constant across the globe. Which of the following is a ubiquitous resource?

A) Copper Ore

Question 3

3. Sustainable development requires that the rate of resource consumption $R_c$ and the rate of resource regeneration $R_r$ satisfy which inequality to maintain ecological balance?

A) $R_c \le R_r$B) $R_c > R_r$C) $R_c \times R_r = 0$D) $R_c = R_r^2$

Answer

✓ Correct Answer: Option A

Explanation: Solution: Sustainable development ensures resources are used such that they are not depleted faster than they can be replenished by nature. Thus, $R_c$ (Consumption) must be less than or equal to $R_r$ (Regeneration).

Question 4

4. In the context of biotic resources, if a population of trees grows at a rate of $P(t) = P_0 e^{rt}$, which factor primarily categorizes them as renewable?

A) Their inorganic originB) Their fixed stock (S)C) Their high market valueD) Their ability to reproduce and regenerate

Answer

✓ Correct Answer: Option D

Explanation: Solution: Renewable resources are those which get renewed or replenished quickly. Biotic resources like plants and animals can reproduce (r > 0), making them renewable.

Question 5

5. Soil formation is a slow process where it takes roughly T = 100 years to form just 1 cm of soil. If a region loses 5 cm of topsoil due to erosion in 1 year, what is the net deficit in years of natural production?

A) 5 yearsB) 100 yearsC) 500 yearsD) 20 years

Answer

✓ Correct Answer: Option C

Explanation: Solution: Time to form 1 cm = 100 years. Time to form $5 cm = 5 \times 100 = 500 years$. Loss of 5 cm in 1 year negates 500 years of natural work.

Question 6

6. Which of the following is considered a "Human-made Resource"?

A) Iron ore found in the crustB) Technology used to extract ironC) Tropical rainforestsD) Natural gas deposits

Answer

✓ Correct Answer: Option B

Explanation: Solution: Natural substances become resources only when their original form has been changed. Technology, bridges, and machinery are Human-made resources.

Question 7

7. Resource value is not always economic. If $V_e$ is economic value and $V_a$ is aesthetic value, a beautiful landscape primarily possesses:

A) Only $V_e$B) $V_e > V_a$C) Neither $V_e$ nor $V_a$D) High $V_a$

Answer

✓ Correct Answer: Option D

Explanation: Solution: Some resources have economic value (metals), while others like a beautiful landscape have aesthetic value. Both are important for human needs.

Question 8

8. The "Ecological Footprint" measures the demand on Earth's ecosystems. If a country's footprint F exceeds its biocapacity B, the country is in:

A) Ecological DeficitB) Ecological SurplusC) Sustainable EquilibriumD) Resource Abundance

Answer

✓ Correct Answer: Option A

Explanation: Solution: If F > B, the population is consuming resources faster than the ecosystem can provide, resulting in a deficit.

Question 9

9. Which conservation method involves planting rows of trees to check wind movement, especially in coastal and dry regions?

A) MulchingB) Shelter beltsC) Contour barriersD) Intercropping

Answer

✓ Correct Answer: Option B

Explanation: Solution: Shelter belts are rows of trees planted to reduce wind speed and prevent soil erosion in open areas.

Question 10

10. CITES (the Convention on International Trade in Endangered Species) aims to ensure that international trade in specimens of wild animals and plants does not threaten their survival. This is an example of:

A) Local resource exploitationB) Economic trade maximizationC) Global conservation effortD) Agricultural expansion

Answer

✓ Correct Answer: Option C

Explanation: Solution: CITES is an international agreement between governments to protect endangered species from over-exploitation through international trade.

Accepted Answer

✓ Correct Answer: Option B

Explanation: Solution: Ubiquitous resources are found everywhere (like air/sunlight). Localized resources (like copper or iron) are found only in specific geographic locations.

Grade 8 : Social Science (Exploring Society) - Natural Resources (Set 1)

1. If Earth has a total water volume of V, and only 2.7% is fresh water, of which 70% is trapped in ice sheets/glaciers, what percentage of V is actually accessible as liquid fresh water for human use?

2. A resource is classified as "Ubiquitous" if its spatial distribution function f(x,y) is constant across the globe. Which of the following is a ubiquitous resource?

3. Sustainable development requires that the rate of resource consumption $R_c$ and the rate of resource regeneration $R_r$ satisfy which inequality to maintain ecological balance?

4. In the context of biotic resources, if a population of trees grows at a rate of $P(t) = P_0 e^{rt}$, which factor primarily categorizes them as renewable?

5. Soil formation is a slow process where it takes roughly T = 100 years to form just 1 cm of soil. If a region loses 5 cm of topsoil due to erosion in 1 year, what is the net deficit in years of natural production?

6. Which of the following is considered a "Human-made Resource"?

7. Resource value is not always economic. If $V_e$ is economic value and $V_a$ is aesthetic value, a beautiful landscape primarily possesses:

8. The "Ecological Footprint" measures the demand on Earth's ecosystems. If a country's footprint F exceeds its biocapacity B, the country is in:

9. Which conservation method involves planting rows of trees to check wind movement, especially in coastal and dry regions?

10. CITES (the Convention on International Trade in Endangered Species) aims to ensure that international trade in specimens of wild animals and plants does not threaten their survival. This is an example of: