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Question (1)

QN0026506

The solar constant is approximately 1.4 kW m–2. If a solar panel of area 2 m² receives this energy for 30 minutes at the top of the atmosphere, how much energy is received?

(A) 5.04 × 10⁶ J
(B) 2.52 × 10⁶ J
(C) 1.4 × 10³ J
(D) 7.2 × 10⁶ J

Correct Answer: A

Explanation:

Energy received = Intensity × Area × Time = 1400 × 2 × 1800 = 5.04 × 10⁶ J.

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Question (2)

QN0026507

A city replaces many green parks with concrete buildings. Which change is most likely to occur first?

(A) Increase in transpiration and cooling
(B) Formation of urban heat island effect
(C) Increase in groundwater recharge
(D) Increase in local biodiversity

Correct Answer: B

Explanation:

Concrete and asphalt absorb and re-radiate more heat, leading to the urban heat island effect.

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Question (3)

QN0026508

If the ozone layer suddenly disappeared, which sequence would most likely occur?

(A) More UV radiation → increased skin damage → ecosystem disturbance
(B) Less UV radiation → reduced photosynthesis → cooling
(C) More infrared radiation → more rainfall → cooling
(D) Less visible light → reduced evaporation

Correct Answer: A

Explanation:

The ozone layer absorbs harmful UV radiation. Without it, UV exposure would increase, harming organisms and ecosystems.

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Question (4)

QN0026509

A region receives snowfall for several years, but due to climate change snowfall decreases drastically. Which sphere is directly affected first and which sphere is affected later?

(A) Biosphere first, cryosphere later
(B) Cryosphere first, hydrosphere later
(C) Atmosphere first, geosphere later
(D) Geosphere first, biosphere later

Correct Answer: B

Explanation:

Reduced snowfall first affects the cryosphere (snow and ice), which later reduces water availability in the hydrosphere.

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Question (5)

QN0026510

Two surfaces receive equal sunlight. Surface A has albedo 0.85 and Surface B has albedo 0.15. Which statement is correct?

(A) Surface A absorbs more energy
(B) Surface B reflects more energy
(C) Surface B becomes warmer
(D) Both remain equally warm

Correct Answer: C

Explanation:

Lower albedo means more absorption of solar radiation, causing Surface B to become warmer.

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Question (6)

QN0026511

The atmosphere contains 78% nitrogen, yet plants cannot directly use it because atmospheric nitrogen is:

(A) highly reactive
(B) insoluble in water
(C) chemically non-reactive
(D) lighter than oxygen

Correct Answer: C

Explanation:

Atmospheric nitrogen (N₂) is chemically inert and must first be fixed into usable compounds.

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Question (7)

QN0026512

A warm ocean current flowing towards higher latitudes is likely to:

(A) cool coastal regions
(B) moderate coastal climate and keep ports ice-free
(C) reduce marine life
(D) increase salinity everywhere

Correct Answer: B

Explanation:

Warm ocean currents transfer heat to coastal regions, moderating climate and keeping ports ice-free.

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Question (8)

QN0026513

If photosynthesis on Earth suddenly stopped, which would happen first?

(A) Atmospheric oxygen would gradually decrease
(B) Atmospheric nitrogen would decrease rapidly
(C) Ozone layer would thicken
(D) Ocean currents would stop immediately

Correct Answer: A

Explanation:

Photosynthesis is the primary source of atmospheric oxygen. Without it, oxygen levels would gradually decline.

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Question (9)

QN0026514

A mountain slope receives intense sunlight during the day. Which wind pattern develops?

(A) Mountain breeze from slope to valley
(B) Valley breeze from valley to slope
(C) Sea breeze from valley to slope
(D) Polar wind from mountain top

Correct Answer: B

Explanation:

During daytime, warm air rises along mountain slopes, causing cooler valley air to move upward as a valley breeze.

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Question (10)

QN0026515

Atmospheric CO₂ concentration increased from 315 ppm in 1960 to 420 ppm in 2025. What is the percentage increase approximately?

(A) 25%
(B) 33%
(C) 50%
(D) 75%

Correct Answer: B

Explanation:

Percentage increase = (420 – 315)/315 × 100 ≈ 33%.

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Question (1)

The solar constant is approximately 1.4 kW m–2. If a solar panel of area 2 m² receives this energy for 30 minutes at the top of the atmosphere, how much energy is received?

Explanation:

Link:

Question (2)

A city replaces many green parks with concrete buildings. Which change is most likely to occur first?

Explanation:

Link:

Question (3)

If the ozone layer suddenly disappeared, which sequence would most likely occur?

Explanation:

Link:

Question (4)

A region receives snowfall for several years, but due to climate change snowfall decreases drastically. Which sphere is directly affected first and which sphere is affected later?

Explanation:

Link:

Question (5)

Two surfaces receive equal sunlight. Surface A has albedo 0.85 and Surface B has albedo 0.15. Which statement is correct?

Explanation:

Link:

Question (6)

The atmosphere contains 78% nitrogen, yet plants cannot directly use it because atmospheric nitrogen is:

Explanation:

Link:

Question (7)

A warm ocean current flowing towards higher latitudes is likely to:

Explanation:

Link:

Question (8)

If photosynthesis on Earth suddenly stopped, which would happen first?

Explanation:

Link:

Question (9)

A mountain slope receives intense sunlight during the day. Which wind pattern develops?

Explanation:

Link:

Question (10)

Atmospheric CO₂ concentration increased from 315 ppm in 1960 to 420 ppm in 2025. What is the percentage increase approximately?

Explanation:

Link:

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