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Question (11)

QN008744

If a 2 m² solar panel receives insolation of 1 kW m⁻² for 2 hours, the energy received is:

(A) 7.2 × 10⁶ J
(B) 1.44 × 10⁷ J
(C) 3.6 × 10⁶ J
(D) 2.0 × 10⁶ J

Correct Answer: B

Explanation:

E = 1000 × 2 × 7200 = 1.44 × 10⁷ J.

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Question (12)

QN008745

A 5 m² rooftop receives insolation of 1 kW m⁻² for 1 hour. Total energy received is:

(A) 3.6 × 10⁶ J
(B) 1.8 × 10⁷ J
(C) 5.0 × 10⁶ J
(D) 3.6 × 10⁵ J

Correct Answer: B

Explanation:

E = 1000 × 5 × 3600 = 1.8 × 10⁷ J.

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Question (13)

QN008746

Under clear sky conditions, the maximum insolation reaching Earth’s surface is approximately:

(A) 0.1 kW m⁻²
(B) 0.5 kW m⁻²
(C) 1.0 kW m⁻²
(D) 1.4 kW m⁻²

Correct Answer: C

Explanation:

Some solar energy is absorbed and scattered before reaching the surface.

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Question (14)

QN008747

If insolation is 1 kW m⁻², how much energy reaches 1 m² in 30 minutes?

(A) 1.8 × 10⁶ J
(B) 3.6 × 10⁶ J
(C) 7.2 × 10⁶ J
(D) 9.0 × 10⁶ J

Correct Answer: A

Explanation:

E = 1000 × 1 × 1800 = 1.8 × 10⁶ J.

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Question (15)

QN008748

Why do dark-coloured roads become hotter than light-coloured roads?

(A) They have higher albedo
(B) They absorb more solar radiation
(C) They emit less heat
(D) They contain more moisture

Correct Answer: B

Explanation:

Dark surfaces absorb more sunlight.

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Question (16)

QN008749

Which of the following combinations is correct?

(A) High albedo → More absorption → Warmer surface
(B) Low albedo → More reflection → Cooler surface
(C) High albedo → More reflection → Cooler surface
(D) Low albedo → No heating

Correct Answer: C

Explanation:

High albedo surfaces reflect more energy and stay cooler.

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Question (17)

QN008750

The polar regions remain cold mainly because:

(A) They receive no sunlight
(B) Solar radiation is spread over a larger area
(C) Air pressure is very low
(D) Oceans absorb all heat

Correct Answer: B

Explanation:

Sun’s rays strike at a slanting angle near the poles.

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Question (18)

QN008751

The equatorial region remains warmer because solar radiation is:

(A) Reflected completely
(B) Concentrated over a smaller area
(C) Blocked by clouds
(D) Absorbed by oceans only

Correct Answer: B

Explanation:

Direct rays concentrate energy in a smaller area.

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Question (19)

QN008752

Uneven heating between the equator and poles mainly creates:

(A) Earthquakes
(B) Volcanoes
(C) Temperature differences
(D) Tides

Correct Answer: C

Explanation:

Different heating causes temperature variations.

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Question (20)

QN008753

If Earth were perfectly flat instead of spherical, which factor causing uneven heating would largely disappear?

(A) Reflection by clouds
(B) Latitude effect
(C) Greenhouse effect
(D) Ozone absorption

Correct Answer: B

Explanation:

Latitude-based variation exists because Earth is spherical.

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Question (11)

If a 2 m² solar panel receives insolation of 1 kW m⁻² for 2 hours, the energy received is:

Explanation:

Link:

Question (12)

A 5 m² rooftop receives insolation of 1 kW m⁻² for 1 hour. Total energy received is:

Explanation:

Link:

Question (13)

Under clear sky conditions, the maximum insolation reaching Earth’s surface is approximately:

Explanation:

Link:

Question (14)

If insolation is 1 kW m⁻², how much energy reaches 1 m² in 30 minutes?

Explanation:

Link:

Question (15)

Why do dark-coloured roads become hotter than light-coloured roads?

Explanation:

Link:

Question (16)

Which of the following combinations is correct?

Explanation:

Link:

Question (17)

The polar regions remain cold mainly because:

Explanation:

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Question (18)

The equatorial region remains warmer because solar radiation is:

Explanation:

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Question (19)

Uneven heating between the equator and poles mainly creates:

Explanation:

Link:

Question (20)

If Earth were perfectly flat instead of spherical, which factor causing uneven heating would largely disappear?

Explanation:

Link:

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