A. pertaining to air
B. automatic
C. sick
D. elastic

Explanation:

The word pneumatic means relating to air or gas (especially using compressed air).

In simple words: something powered or filled with air.

So, the synonym of pneumatic is pertaining to air.

Real-Life Example

• A pneumatic tire uses air pressure.
• An air-filled tire uses compressed air.

Air-related = Pneumatic

Main Points for Exams

• Pneumatic means related to air or gas pressure.
• Pertaining to air is its correct synonym.
• Other options are unrelated meanings.
• Therefore, Option A is correct.
• Common in PPSC, FPSC, CSS, PMS, NTS, IELTS, TOEFL exams.

Quick Memory Trick

💨 Pneumatic = Air Powered
🌬️ Pertaining to Air = Same Meaning

Solid ↔ Pneumatic
Pneumatic ↔ Air-related ✔️