Physics - Study Mode
[#1021] A fresh egg when placed in salt water will
Correct Answer
(C) Float
Explanation
Solution: Adding salt to the water increases the density of the solution because the salt increases the mass without changing the volume very much. When enough salt is added to the water, the saltwater solution's density becomes higher than the egg's, so the egg will then float.
[#1022] Burns caused by steam are much severe than those caused by boiling water because
Correct Answer
(B) Steam has latent heat
Explanation
Solution: Steam produces more severe burns than boiling water even though both are at 100 o C because steam contains more heat, in the form of latent heat, than boiling water.
[#1023] Which of the following produces more severe burns ?
Correct Answer
(C) Steam
Explanation
Solution: Steam produces more severe burns than boiling water even though both are at 100 o C because steam contains more heat, in the form of latent heat, than boiling water.
[#1024] Heat stored in water vapour is
Correct Answer
(B) Latent heat
Explanation
Solution: When air is cooled and water vapour condenses to form water liquid, energy is released as water particles 'give up' some of their energy in order to slow down and move closer together again. The same is true when liquid water freezes to become ice. This energy is also called latent heat.
[#1025] Which one of the following has the highest value of specific heat?
Correct Answer
(D) Water
Explanation
Solution: Among all the four water has the highest specific heat.