Insolation and factors affecting it

Correct answer: A. Higher heat capacity of water

Water heats and cools slowly because of high heat capacity. Therefore marine temperature changes slowly.

Correct answer: B. Likely high

High Sun altitude makes rays direct and clear air blocks them less. Therefore insolation can be high.

Correct answer: A. Radiation is blocked and scattered more

Low transparency means dust moisture or clouds block more radiation. Thus less energy reaches the surface.

Correct answer: B. Received energy may slightly increase when distance decreases

When Earth is closer to the Sun it may receive slightly more energy. But axial tilt is the main cause of seasons.

Correct answer: C. Clear sky and vertical rays

Clear sky blocks less radiation and vertical rays concentrate energy. Both conditions increase insolation.

Correct answer: B. Dense cloud and high albedo

Dense cloud reduces energy reaching the surface and high albedo returns more energy. Both reduce heating.

Correct answer: A. In the morning, the Sun’s rays are oblique and travel through a greater thickness of the atmosphere

In the morning, the Sun is near the horizon, so its rays strike the surface obliquely. They pass through a greater thickness of the atmosphere, where more energy is scattered and absorbed. Oblique rays also spread over a larger area, reducing insolation per unit area. At noon, the higher Sun gives more direct rays. Exam tip: As the Sun’s altitude increases, insolation received per unit area generally increases.

Correct answer: A. Earth's rotation and change in Sun altitude

Earth's rotation changes the Sun's altitude through the day. Therefore morning noon and evening insolation differ.

Correct answer: A. Earth's axial tilt and revolution

Axial tilt and revolution change day length and angle of rays. This causes annual variation of insolation.

Correct answer: A. Snow reflects more energy

Vertical rays increase insolation but high albedo of snow reduces absorption. Therefore understand factors together.

Correct answer: A. Atmospheric path and dust obstruction can be less

At high altitude the atmospheric layer can be thinner and obstruction to radiation may be lower. Hence sunlight can feel strong.

Correct answer: A. If the surface is water with high heat capacity

Water has high heat capacity and heats slowly. Therefore temperature may rise slowly even with more insolation.

Correct answer: A. Their absorption and heat capacity can differ

Surface colour albedo and heat capacity change temperature response. Thus equal insolation does not always give equal temperature.

Correct answer: A. Insolation affects temperature but surface nature is also important

Insolation is the basis of heating but albedo heat capacity and moisture also affect temperature. In exams consider more than one factor.

Correct answer: A. Energy spreads in different directions

In scattering radiation goes in different directions. Thus some direct energy does not reach the surface.

Correct answer: A. Insolation reaching the surface may decrease

Smoke and particles can scatter and absorb solar radiation. This can reduce energy reaching the surface.

Correct answer: B. Insolation will be high

The direct answer is B: insolation will be high. Each condition in the statement supports more solar energy reaching and being absorbed by the surface. Step by step: less dust means less scattering and absorption by suspended particles; fewer clouds mean less reflection and blocking; vertical rays concentrate energy on a smaller surface area and travel through a shorter effective atmospheric path; together these conditions allow relatively large insolation. Option A is wrong because it reverses the effect of the stated conditions. Option B is correct because all three conditions favour strong incoming solar radiation. Option C is wrong because some sunlight is reaching the place, so insolation cannot be zero. Option D is wrong because insolation is solar radiation received mainly during daylight, not only at night. The conclusion is about likely insolation; actual heating can still be modified by surface type, wind, humidity, and duration. Exam cue: clear air plus clear sky plus direct rays means high insolation.

Correct answer: A. Spreading of rays over a large area

Long day increases total time but oblique rays reduce energy per unit area. Consider both effects together.

Correct answer: A. South facing slope becoming warmer

Slope aspect affects the receipt of sun rays. Therefore microclimate can differ in mountainous areas.

Correct answer: C. Grass can have evaporation and relatively higher reflection

A grassy surface uses heat in evaporation and does not absorb as much energy as a black road. Therefore temperature can remain lower.

Correct answer: A. Surface heating is likely to increase

Low cloud cover allows more insolation and low albedo increases absorption. Both can increase heating.

Correct answer: A. It affects both energy spread and atmospheric path

The angle of rays changes energy distribution per unit area and the distance through the atmosphere. So it is a major factor.

Correct answer: A. Sun rays become more oblique

At higher latitudes rays fall obliquely and spread over a larger area. Therefore energy per unit area decreases.

Correct answer: A. The surface reflects more energy

Even after receiving more insolation, a high albedo surface sends much energy back. Therefore actual heating can remain low.

Correct answer: B. Consider angle of rays, day duration, clouds, and albedo together

Insolation is affected by many factors, so do not decide by only one clue. It is better to check angle, day duration, clouds, and albedo together.