Related Questions

Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?
A 1 hour
B 2 hours
C 3 hours
D 4 hours
E 5 hours
STP-তে একটি আদর্শ গ্যাসকে প্রথমে তার প্রাথমিক আয়তনের এক-তৃতীয়াংশে সংকুচিত করা হয়, এবং তারপর প্রসারিত হতে দেওয়া হয় যতক্ষণ না তার চাপ প্রাথমিক চাপের অর্ধেক হয়। উভয় প্রক্রিয়ায় গ্যাসের তাপমাত্রা স্থির থাকে। যদি গ্যাসের প্রাথমিক অভ্যন্তরীণ শক্তি । হয়ে থাকে তাহলে এর চূড়ান্ত অভ্যন্তরীণ শক্তি কত? (An ideal gas at STP is first compressed to one-third of its initial volume and then allowed to expand until its pressure is half the initial pressure. The temperature of the gas remains constant during both the processes. If the initial internal energy of the gas is U, what is its final internal energy?)
A U/3
B U/2
C U
D 2U/3
Entropy of a substance remains constant during a/an __________ change.
A Reversible isothermal
B Irreversible isothermal
C Reversible adiabatic
D None of these
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is
A 0
B 1
C ∞
D None of these
A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant , is called
A isothermal process
B adiabatic process
C hyperbolic process
D polytropic process
A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called
A Isothermal process
B Hyperbolic process
C Adiabatic process
D Polytropic process
Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in
A Increased COP
B Same COP
C Decreased COP
D Increased or decreased COP ; depending upon the type of refrigerant
In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in
A Enhanced COP
B Decreased COP
C No change in the value of COP
D Increased or decreased COP ; depending upon the type of refrigerant
The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
A 0
B 1
C γ
D ∝
When the expansion or compression takes place according to the law pvn = C, the process is known as
A Isothermal process
B Adiabatic process
C Hyperbolic process
D Polytropic process

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