Q1.Thermodynamics is the branch of physical science concerned with
Answer : Option AExplaination / Solution:
Thermodynamics deals with heat and its transformation from one form to another.
The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
Q2.In a closed system, Which of the following take place ?
Answer : Option AExplaination / Solution:
In a closed system, there is no flow of matter from system to surrounding or vice versa.
For example, a certain quantity of fluid bounded within a closed cylinder constitutes a closed system.
Q3.In an open system, which if the following take place ?
Answer : Option BExplaination / Solution:
In open system there is flow of matter and energy in and out of the system or vice versa.
For example, an air compressor in which the air enters at a low pressure and exit at high pressure and there is energy interaction with the surrounding
Q4.first law of thermodynamics is a restatement of
Answer : Option AExplaination / Solution:
t is restatement of law of conservation of energy.
It states that Thermodynamics isthe branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
Q5.According to first law of thermodynamics ΔU = q + w, where
Answer : Option BExplaination / Solution:
In thermodynamics q=+ve when heat is supplied to the system. And w=+ve when work is done on the system while when work is done by the system w is taken as –ve.
Q8.The correct equation for change in enthalpy is:
Answer : Option AExplaination / Solution:
Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
Answer : Option CExplaination / Solution:
The molar heat capacity of a substance is the quantity of heat needed to raise the temperature of one mole by one degree Celsius.