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01. The energy of the isolated system is always a constant, which is given by(आइसोलेशन सिस्टम की ऊर्जा सदैव स्थिर होती है यह किसके द्वारा दिया गया है): .
Ans. (b) : Isolated System–An isolated system is a thermodynamic system that cannot exchange either energy or mass outside the boundaries of the system. So, ∆E = 0, ∆m = 0 So from the first law of thermodynamics energy of the isolated system will be remain constant
02. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as( संचालन की एक श्रृंखला, जो अंत में एक निश्चित आदेश और प्रारंभिक स्थितियों को पुनर्स्थापित करें)
Ans. (c) : Thermodynamic cycle– A series of operation which takes place in a certain order and restore the initial conditions at the end, is known as thermodynamic cycle थर्मोडायनामिक चक्र- एक श्रृंखलासंचालन है जो एक निश्चित क्रम में होती है और अंत में प्रारंभिक स्थितियों को पुनर्स्थापित करने, के रूप में जाना जाती है.
3. Heat and work are :
Ans. (d) : Heat and work are path function similarities between heat and work : (i) Both are recognized at the boundary of the system, as they cross the boundary phenomena. (ii) System possesses - energy, but neither heat and work. (iii) Both are associated with process not state. Heat and work have no meaning at a state. (iv) Both are path functions. • Path function- Magnitude depends on the path followed during the process as well as the end states. • Point function- Magnitude depends on state only and not a how the system approaches that state.
4. What are the properties of a thermodynamic system whose value for the entire system is equal to the sum of their values for individual parts of the system?
Ans. (b) : Extensive properties- Extensive properties of matter that changes as the amount of matter changes Example- Volume, enthalpy, entropy etc. Intensive properties- An intensive properties is a bulk property, meaning that it is a local physical property of a system that does not depends on the system size or the amount of material in the system. Example- Pressure, temperature, refractive index, density and hardness of object.
5. Consider the following properties: 1. Temperature 2. Viscosity 3. Specific entropy 4. Thermal conductivity. Which of the above properties of a system is/are intensive?
Ans : (d) : Properties of intensive are as follows- • Temperature • Viscosity • Specific entropy • Thermal conductivity • Specific volume • Specific enthalpy
6. An open system
Ans : (a)
7. Match the following : 1. Closed system a. Increase in static pressure 2. Open system b. Increase in kinetic energy 3. Pump c. Heat, mass and work interact 4. Turbine d. Heat and work interact 5. Nozzle e. Delivers work
Ans. (a) : 1. Closed system -Heat and work interact 2. Open system -Heat, mass and work interact 3. Pump -Increase in static pressure 4. Turbine- Delivers work 5. Nozzle- Increase in kinetic energy
8. The law which provides the basis of temperature measurement is:
Ans. (b) : 1. Zeroth law of thermodynamics provides the basis of temperature measurement. 2. First law of thermodynamics provides conservation law of energy. 3. Second law of thermodynamics provides the basic concept of entropy
9. Which one of the following is the extensive property of the system?
Ans : (a) : These properties are dependent on mass e.g. volume, energy, Heat capacity (Cv, Cp), enthalpy, entropy.
10. Pressure exerted by a gas in a closed container is:
Ans : (c) : Pressure exerted by a gas in a closed container is strong function of density and temperature.