Physics - Study Mode
[#741] Which of these branches of Physics deal with heat and temperature and their relation to energy and work?
Correct Answer
(D) Thermodynamics
Explanation
Solution: Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy. In particular, it describes how thermal energy is converted to and from other forms of energy and how it affects matter.
[#742] The characteristic invalid for heat radiation is that it travels :
Correct Answer
(C) With the speed of light
Explanation
Solution: Heat is a form of energy. An important property of heat is that it flows from a body at higher temperature to another body at lower temperature.
[#743] A cycle tyre bursts suddenly. This represents an :
Correct Answer
(B) Adiabatic process
Explanation
Solution: When a tyre bursts suddenly energy is not immediately transferred between the system and the surrounding. So the process is adiabatic. There sudden expansion of its air into the atmosphere is adiabatic and the tyre is cooled. In adiabatic process, heat neither enters the system nor leaves the system.
[#744] Which has the lowest albedo?
Correct Answer
(A) Dark surfaces
Explanation
Solution: Albedo is a measure of reflectivity. This clearly indicates that all black surfaces have the lowest albedo. Fresh snow reflects approximately 95 percent of the sun's rays so it has the highest albedo.
[#745] Which one of the following is a non-dimensional quantity?
Correct Answer
(B) Strain
Explanation
Solution: Strain is a non-dimensional quantity.