4921. On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will
A. Increase
B. Decrease
C. Remain same
D. Increase in summer and will decrease in winter
✅ The correct answer is option A.
Chemical Engineering
Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.
4922. Refrigerants commonly used for domestic refrigerators are
A. Ethyl chloride or methyle chloride
B. Freon-12
C. Propane
D. NH₃ or CO₂
✅ The correct answer is option A.
4923. Chemical formula of BHC, which is an insecticide is
C₆H₆Cl₆
C₆Cl₆
C₆H₅Cl
C₆H₄Cl₂
✅ The correct answer is option A.
4924. The necessary and sufficient condition for equilibrium between two phases is
A. The concentration of each component should be same in the two phases
B. The temperature of each phase should be same
C. The pressure should be same in the two phases
D. The chemical potential of each component should be same in the two phases
✅ The correct answer is option D.
4925. Which of the following is an undesirable characteristics of a refrigerant ?
A. It should be non-explosive
B. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
C. Its vapor pressure at the condenser temperature should be very high
D. None of these
✅ The correct answer is option B.
4926. __________ paper is used in the manufacture of newsprint paper.
Groundwood
Board
Tissue
Wrapping
✅ The correct answer is option A.
4927. For an ideal gas, the activity co-efficient is
A. Directly proportional to pressure
B. Inversely proportional to pressure
C. Unity at all pressures
D. None of these
✅ The correct answer is option C.
4928. Entropy is a measure of the __________ of a system.
A. Disorder
B. Orderly behaviour
C. Temperature changes only
D. None of these
✅ The correct answer is option A.
4929. Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have
High electrical insulation properties
Sharp melting points
Low co-efficient of thermal expansion
Compressive strength much greater than their tensile strengths
✅ The correct answer is option B.
4930. Heat of reaction at constant volume is identified with __________ change.
A. Enthalpy
B. Internal energy
C. Either A or B
D. Neither A nor B
✅ The correct answer is option B.