WAEC Physics 2024 Objective — Question 15
Question 15 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.
Advertisement
15. A cube of wood of side 10.0 cm floats vertically in water with 4.5 cm of its length submerged. Calculate the density of the wood. [Density of water=1 gcm^-3]
- A. 0.450 gcm^-3Correct
- B. 0.203 gcm^-3
- C. 0.090 gcm^-3
- D. 0.045 gcm^-3
Explanation
Volume of cube=10x10x10=1000cm^3. Volume submerged=10x10x4.5=450cm^3. Mass of water displaced=1gcm^-3 x 450cm^3=450g. By the principle of flotation, mass of cube = mass of water displaced = 450g. Density of cube = 450g/1000cm^3 = 0.45gcm^-3.
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.