3927. With increase in pressure (above atmospheric pressure), the Cp of a gas
A. Increases
B. Decreases
C. Remains unchanged
D. First decreases and then increases
✅ The correct answer is option A.
3932. Entropy change of the reaction, H₂O(liquid) H₂O(gas), is termed as the enthalpy of
A. Solution
B. Vaporisation
C. Formation
D. Formation
✅ The correct answer is option B.
3937. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.
A. Isobaric
B. Isothermal
C. Adiabatic
D. None of these
✅ The correct answer is option B.
3905. The third law of thermodynamics states that the
A. Heat capacity of a crystalline solid is zero at absolute zero temperature
B. Heat transfer from low temperature to high temperature source is not possible without external work
C. Gases having same reduced properties behave similarly
D. None of these
✅ The correct answer is option A.
3894. Commercial power generation from fusion reactor is not yet possible, because
it is difficult to control fusion reaction.
the fuel required (e.g. deuterium and tritium) is scarce.
it is difficult to initiate fusion reaction.
quantity of fuel required for initiating fusion reaction is prohibitively high.
✅ The correct answer is option A.
3875. The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.
3.125
6.25
12.5
25
✅ The correct answer is option B.
3882. The 92U238 emits an a-particle. The product is
90U234
90U238
90U236
92U236
✅ The correct answer is option A.
3887. Sodium melts (at atmospheric pressure) at a temperature of __________ °C.
58
98
348
588
✅ The correct answer is option B.
3889. Which of the following is not an ore of uranium ?
Pitchblende
Kyanite
Carnotite
Rescolite
✅ The correct answer is option B.
3895. The atomic number of an element is equal to the number of __________ present in its atom.
neutrons
electrons
protons
either (b) or (c)
✅ The correct answer is option D.