80g of water at 30°C is poured on a large block of ice which is at 0°C. The mass of ice that melts is --------
Correct answer: A. 30g
- A. 30g
- B. 80g
- C. 150g
- D. 1600g
Explanation
Option A is correct.Heat contained in waterQ=msΔT (s=1cal/gm/ o C) Q=80×1×(30−0)Q=2400Cal Then, heat gained by ice will be sameQ=2400Lf ×M=2400 (L f =80cal/gm)M=2400/ 80 M=30gm Thus, 30gm of ice is melted.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
Practise Thermodynamics
714 free Thermodynamics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Thermal Equilibrium and Heat questions
Heat given to a body, which raises its temperature by 1°C is -------------
Some water at 0°C is placed in a large insulated enclosure (vessel). The water vapour formed is pumped out continuously. What fraction of the water will ultimately freeze, if the latent heat vaporization is seven times the latent heat of fusion?
If two rods of length L and 2L having coefficient of linear expansion α and 2α respectively are connected so that total length becomes 3L, the average coefficient of linear expansion of the composition rods equals :
Mud houses are cooler in summer and warmer in winter because ---------
Heat capacity of a substance is infinite. It means --------
The internal energy of a body is maximum when its temperature is: