What can be used as a tracing powder when checking for small oil leaks?

• A. Talcum powder
• B. Aerosol foot powder
• C. Chalk dust
• D. Cornstarch

Answer: (B)

When tracing small oil leaks, you want a powder that can be applied as a fine, controlled mist and will cling to oily surfaces so the leak path becomes visible. Aerosol foot powder fits this purpose well because it can be sprayed evenly over suspected areas, and escaping oil will carry the powder along, making the exact leak point easy to spot. The other options don’t provide the same combination of easy, directed application and clear visibility: talcum powder isn’t sprayed as a mist for precise coating; chalk dust is coarse and messy, not ideal for revealing narrow leaks; cornstarch can clump or be less noticeable on metal surfaces.