Avielevate / DGCA CPL papers / Aviation Meteorology / TEMPERATURE
TEMPERATURE — DGCA CPL Aviation Meteorology
Chapter J03 of the Aviation Meteorology paper. 39 practice questions in the Avielevate bank, every one with its answer key, filterable into a timed set on this chapter alone.
What this chapter covers
The learning objectives we file TEMPERATURE questions under, and how many sit behind each. These come straight out of the bank and are regenerated whenever it changes — they are what is there today, not a claim.
| Learning objective | In the bank |
|---|
| __GEN__ General | 39 questions |
Sample TEMPERATURE questions, answered and explained
Real questions from this chapter, with the answer marked and the reasoning written out — the same explanations you get inside the app.
0312002 · TEMPERATURE
On a clear day, about how much of the solar radiation reaches the Earth's surface?
- A1/4
- B30%
- C5/6
Why that is the answer
**Concept**
The Sun's energy reaches us as **solar radiation**, mostly visible light and near-infrared, called **short-wave radiation**. On its way down through the atmosphere, part of it is **reflected** back to space (mainly by cloud), part is **scattered** by air molecules and dust (which makes the sky blue), and part is **absorbed** by water vapour, ozone and dust. Only what is left reaches the ground.
**Explanation**
Clear air is almost **transparent** to short-wave radiation, like a clean window. The biggest single loss is reflection from **cloud tops**, which can send most of the sunlight straight back to space.
On a **clear day** there is no cloud, so only the smaller losses by scattering and absorption remain. The standard textbook figure is that about **five-sixths** (roughly 80 to 85%) of the incoming solar radiation reaches the surface. The real value varies with the height of the Sun and the amount of dust, haze and water vapour; on an overcast day far less gets through.
This strong heating of the ground on clear days is what drives thermals, afternoon low-level turbulence and cumulus development.
**Applying it to the question**
With no cloud to reflect the sunlight, most of it reaches the ground: about **5/6**.
**Remember for DGCA:** clear sky = most solar radiation (about 5/6) reaches the surface; cloud is the main thing that stops it.
0312013 · TEMPERATURE
Convert 68°F into kelvin.
- A233 K
- B283 K
- C294 K
- D293 K
Why that is the answer
**Given**
Temperature = **68°F**
**Required**
The same temperature in **kelvin (K)**.
**Formula**
Fahrenheit to Celsius: °C = (°F − 32) × 5/9
Celsius to kelvin: K = °C + 273
The 32 is subtracted first because water freezes at 32°F but at 0°C. The 5/9 is needed because 100 Celsius degrees cover the same span as 180 Fahrenheit degrees (0 to 100°C and 32 to 212°F), and 100/180 = 5/9.
**Step-by-step calculation**
°C = (68 − 32) × 5/9 = 36 × 5/9 = **20°C**
K = 20 + 273 = **293 K**
Check: 20°C is a mild room temperature, and 68°F is the familiar Fahrenheit value for the same thing, so the answer makes sense.
**Final answer**
68°F = 20°C = **293 K**.
**Exam tip:** always go through Celsius: subtract 32, multiply by 5/9, then add 273. Do not add 273 to a Fahrenheit value.
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Frequently asked
How many TEMPERATURE questions are there for the DGCA CPL Aviation Meteorology paper?
Avielevate's bank carries 39 published TEMPERATURE questions for Aviation Meteorology, mapped across 1 learning objective. Every one has its answer key, and explanations are being written across the whole bank.
How much of the Aviation Meteorology paper is TEMPERATURE?
The DGCA does not publish a per-chapter breakdown of its papers, so nobody can honestly tell you — and we will not guess. What we can tell you is what students who have just sat a paper reported meeting, which is measured rather than rumoured: that is the exam recall report inside the app.
What is the best way to revise TEMPERATURE?
Sit a short timed set on this chapter alone, tag how sure you were of each answer, then drill the two that actually leak marks: the ones you got right while guessing, and the ones you got wrong while confident. Avielevate does that tagging for you and puts anything you got wrong back in front of you on a spaced schedule.
The rest of the Aviation Meteorology paper
One account covers every chapter of every paper.
← All Aviation Meteorology chapters · All six DGCA CPL papers