Post-UTME Physics 2019 Objective — Question 5
Question 5 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.
Advertisement
The essential factor that reduces heat loss by radiation in a thermos flask is the presence of
- A. a cork
- B. a vacuum
- C. a glass material
- D. silvered wall surfaceCorrect
Explanation
The silvered walls of a thermos flask reflect radiant heat back, reducing heat loss by radiation.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.