# Chemical Engineering Mcqs with Solved Answers & 2026 Past Papers (Page 26) | TestPrep > Practice verified Chemical Engineering Mcqs with answers, detailed explanations, and 2026 past papers syllabus for FPSC, PPSC, NTS, CSS, and PMS exams in Pakistan. --- Official 2026 Examination Syllabus Verified Answers # Chemical Engineering Mcqs Solved MCQs Showing 501 – 520 of **8,664** verified multiple choice questions with explanations and past paper analysis. - [Take Chemical Engineering Mcqs Quiz](https://test-prep.blog/quiz/smart?category=chemical-engineering-mcqs) Q501 NTS / FPSC / PPSC - [### What happens in a reversible adiabatic compression ?](https://test-prep.blog/mcq/what-happens-in-a-reversible-adiabatic-compression-0681a8f8-d5b5-4936-bf16-7ae3cc102c12) A. Heating occurs B. Cooling occurs C. Pressure is constant D. Temperature is constant Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/what-happens-in-a-reversible-adiabatic-compression-0681a8f8-d5b5-4936-bf16-7ae3cc102c12) Q502 NTS / FPSC / PPSC - [### The equation, Cp – Cv = R, is true for _____ gas?](https://test-prep.blog/mcq/the-equation-cp-cv-r-is-true-for-gas-2ca35010-61d8-423d-ad84-6258a92ecd20) A. No B. Any real C. Only ideal D. Both B. and C. Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/the-equation-cp-cv-r-is-true-for-gas-2ca35010-61d8-423d-ad84-6258a92ecd20) Q503 NTS / FPSC / PPSC - [### Compound having large heat of formation is _____ ?](https://test-prep.blog/mcq/compound-having-large-heat-of-formation-is-3f20e2f2-b798-45d8-8b8e-6e7322735db3) A. More stable B. Less stable C. Not at all stable (like nascent O2) D. Either more or less stable; depends on the compound Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/compound-having-large-heat-of-formation-is-3f20e2f2-b798-45d8-8b8e-6e7322735db3) Q504 NTS / FPSC / PPSC - [### The heat capacities for the ideal gas state depend upon the _____ ?](https://test-prep.blog/mcq/the-heat-capacities-for-the-ideal-gas-state-depend-upon-the-c81bc365-bed0-4a8c-a260-955cf6faf10d) A. Pressure B. Temperature C. Both A. & B. D. Neither A. nor B. Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/the-heat-capacities-for-the-ideal-gas-state-depend-upon-the-c81bc365-bed0-4a8c-a260-955cf6faf10d) Q505 NTS / FPSC / PPSC - [### Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____ ?](https://test-prep.blog/mcq/absorptionevolution-of-heat-during-conversion-of-a-substance-from-one-allotropic-de90bae2-697a-43a3-993e-0240b8b8996a) A. Sublimation B. Fusion C. Transition D. Vaporisation Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/absorptionevolution-of-heat-during-conversion-of-a-substance-from-one-allotropic-de90bae2-697a-43a3-993e-0240b8b8996a) Q506 NTS / FPSC / PPSC - [### Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is _____ ?](https://test-prep.blog/mcq/joule-thomson-co-efficient-which-is-defined-as-tph-1cp-htp-changes-sign-at-a-tem-56dfa7e3-579c-434c-aa04-27fe5b6740d4) A. 0 B. ∞ C. +ve D. -ve Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/joule-thomson-co-efficient-which-is-defined-as-tph-1cp-htp-changes-sign-at-a-tem-56dfa7e3-579c-434c-aa04-27fe5b6740d4) Q507 NTS / FPSC / PPSC - [### To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 – 1/T2) from the exact Clapeyron equation, it is assumed that the _____ ?](https://test-prep.blog/mcq/to-obtain-integrated-form-of-clausius-clapeyron-equation-ln-p2p1-hvr-1t1-1t2-fro-82e6882c-9553-46e2-89d8-75972b504ffd) A. Volume of the liquid phase is negligible compared to that of vapour phase B. Vapour phase behaves as an ideal gas C. Heat of vaporisation is independent of temperature D. All A , B. & C. Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/to-obtain-integrated-form-of-clausius-clapeyron-equation-ln-p2p1-hvr-1t1-1t2-fro-82e6882c-9553-46e2-89d8-75972b504ffd) Q508 NTS / FPSC / PPSC - [### For a given substance at a specified temperature, activity is _____ to fugacity?](https://test-prep.blog/mcq/for-a-given-substance-at-a-specified-temperature-activity-is-to-fugacity-effc8a01-b10e-41ed-b9c1-45bd3ae61b26) A. Directly proportional B. Inversely proportional C. Equal D. None of these Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/for-a-given-substance-at-a-specified-temperature-activity-is-to-fugacity-effc8a01-b10e-41ed-b9c1-45bd3ae61b26) Q509 NTS / FPSC / PPSC - [### Linde gas liquefaction process employs cooling _____ ?](https://test-prep.blog/mcq/linde-gas-liquefaction-process-employs-cooling-42a5f388-9e47-41a0-8f89-9ed28603855a) A. By throttling B. By expansion in an engine C. At constant pressure D. None of these Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/linde-gas-liquefaction-process-employs-cooling-42a5f388-9e47-41a0-8f89-9ed28603855a) Q510 NTS / FPSC / PPSC - [### In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible _____ process?](https://test-prep.blog/mcq/in-the-equation-pvn-constant-if-the-value-of-n-y-cpcv-then-it-represents-a-rever-a2817602-4971-4aa1-9525-1d0f372db3fd) A. Isothermal B. Adiabatic C. Isentropic D. Polytropic Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/in-the-equation-pvn-constant-if-the-value-of-n-y-cpcv-then-it-represents-a-rever-a2817602-4971-4aa1-9525-1d0f372db3fd) Q511 NTS / FPSC / PPSC - [### The kinetic energy of gas molecule is zero at _____ ?](https://test-prep.blog/mcq/the-kinetic-energy-of-gas-molecule-is-zero-at-a7c6cfd7-b717-4f95-99c3-bea2dfdc5e18) A. 0°C B. 273°C C. 100°C D. -273°C Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/the-kinetic-energy-of-gas-molecule-is-zero-at-a7c6cfd7-b717-4f95-99c3-bea2dfdc5e18) Q512 NTS / FPSC / PPSC - [### A system is said to be at equilibrium, if the entropy of the system has reached _____ value?](https://test-prep.blog/mcq/a-system-is-said-to-be-at-equilibrium-if-the-entropy-of-the-system-has-reached-v-c69e0366-5c89-47a6-91eb-59940fc498e6) A. Minimum B. Zero C. Maximum D. None of these Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/a-system-is-said-to-be-at-equilibrium-if-the-entropy-of-the-system-has-reached-v-c69e0366-5c89-47a6-91eb-59940fc498e6) Q513 NTS / FPSC / PPSC - [### Fugacity is a measure of the _____ ?](https://test-prep.blog/mcq/fugacity-is-a-measure-of-the-79d3fa16-eb43-4c20-9344-a36ee0668806) A. Escaping tendencies of the same substance in different phases of a system B. Relative volatility of a mixture of two miscible liquids C. Behaviour of ideal gases D. None of these Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/fugacity-is-a-measure-of-the-79d3fa16-eb43-4c20-9344-a36ee0668806) Q514 NTS / FPSC / PPSC - [### Isobaric process means a constant process ?](https://test-prep.blog/mcq/isobaric-process-means-a-constant-process-bb369cb9-2b3c-4f54-826d-cbd41f97a08f) A. Temperature B. Pressure C. Volume D. Entropy Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/isobaric-process-means-a-constant-process-bb369cb9-2b3c-4f54-826d-cbd41f97a08f) Q515 NTS / FPSC / PPSC - [### Rotary lime kiln is an example of a/an _____ system?](https://test-prep.blog/mcq/rotary-lime-kiln-is-an-example-of-aan-system-aa5c58f1-3990-4f36-9062-bc4b7c3d05a4) A. Closed B. Open C. Isolated D. Non-thermodynamic Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/rotary-lime-kiln-is-an-example-of-aan-system-aa5c58f1-3990-4f36-9062-bc4b7c3d05a4) Q516 NTS / FPSC / PPSC - [### For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system _____ as its mole fraction increases?](https://test-prep.blog/mcq/for-a-stable-phase-at-constant-pressure-and-temperature-the-fugacity-of-each-com-33a905d0-0ea6-4e43-983f-ef9be887300a) A. Decreases B. Increases C. Remain same D. Decreases linearly Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/for-a-stable-phase-at-constant-pressure-and-temperature-the-fugacity-of-each-com-33a905d0-0ea6-4e43-983f-ef9be887300a) Q517 NTS / FPSC / PPSC - [### Mollier chart is a _____ plot?](https://test-prep.blog/mcq/mollier-chart-is-a-plot-a620cbc0-cdca-4757-97f0-9d85b2ea4288) A. Pressure vs. enthalpy B. Pressure vs. volume C. Enthalpy vs. entropy D. Temperature vs. entropy Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/mollier-chart-is-a-plot-a620cbc0-cdca-4757-97f0-9d85b2ea4288) Q518 NTS / FPSC / PPSC - [### During a reversible isothermal expansion of an ideal gas, the entropy change is _____ ?](https://test-prep.blog/mcq/during-a-reversible-isothermal-expansion-of-an-ideal-gas-the-entropy-change-is-a82ea24f-274e-4fdb-bda4-7200a93a2ed3) A. +ve B. 0 C. -ve D. ∞ Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/during-a-reversible-isothermal-expansion-of-an-ideal-gas-the-entropy-change-is-a82ea24f-274e-4fdb-bda4-7200a93a2ed3) Q519 NTS / FPSC / PPSC - [### A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the _____ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively) ?](https://test-prep.blog/mcq/a-two-stage-compressor-is-used-to-compress-an-ideal-gas-the-gas-is-cooled-to-the-fb62d32f-ff4f-45d4-953a-60e19783d637) A. Logarithmic B. Arithmetic C. Geometric D. Harmonic Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/a-two-stage-compressor-is-used-to-compress-an-ideal-gas-the-gas-is-cooled-to-the-fb62d32f-ff4f-45d4-953a-60e19783d637) Q520 NTS / FPSC / PPSC - [### As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches _____ ?](https://test-prep.blog/mcq/as-pressure-approaches-zero-the-ratio-of-fugacity-to-pressure-fp-for-a-gas-appro-7d2da2ae-377e-4e2e-8b8f-2249940ca473) A. Zero B. Unity C. Infinity D. An indeterminate value Reveal Answer - [View Full Details & Discussion →](https://test-prep.blog/mcq/as-pressure-approaches-zero-the-ratio-of-fugacity-to-pressure-fp-for-a-gas-appro-7d2da2ae-377e-4e2e-8b8f-2249940ca473) - [Previous Page](https://test-prep.blog/categories/chemical-engineering-mcqs?page=25)Page 26 of 434 - [Next Page](https://test-prep.blog/categories/chemical-engineering-mcqs?page=27) Editorial Analysis & Exam Strategy ## Chemical Engineering Mcqs Preparation Guide for Competitive Exams The Chemical Engineering Mcqs section constitutes one of the highest-weightage modules across major competitive recruiting tests conducted by FPSC, PPSC, SPSC, KPPSC, BPSC, NTS, and the CSS Screening (MPT). Candidates who systematically practice verified solved past questions attain a statistically verified 42% higher score on negative-marking objective papers. #### FPSC (Federal Public Service Commission) 20% - 50% of General Ability Paper Questions emphasize analytical depth, conceptual definitions, and contemporary developments. #### PPSC (Punjab Public Service Commission) 15% - 25% of 100-mark One-Paper MCQs Strong focus on direct factual accuracy, past paper repetitions, and textbook fundamentals. #### NTS (National Testing Service) 25% - 35% of GAT & NAT Tests Strict timing constraints (approx. 50 seconds per MCQ). Rapid recall is critical. #### CSS & PMS Compulsory 20 MCQs (20 Marks) in each Compulsory Subject Qualifying threshold determinant. Correct answers in objective sections secure merit ranking. ### Proven Study Methodology Topic-Wise Mastery: Begin by solving questions in batches of 20 with immediate answer verification. Negative Marking Shield: In competitive exams, guessing indiscriminately carries a 0.25 mark penalty. Practice identifying questions where you can eliminate 2 incorrect distractors before attempting. Smart Spaced Repetition: Use our Bookmark and Mistake Revision engines to re-test incorrectly answered questions within 48 hours to lock them into long-term memory. Timed Speed Runs: Attempt the Daily Study Challenge under timed conditions to build test-day cognitive endurance. ### Frequently Asked Questions about Chemical Engineering Mcqs #### How many questions are included in the Chemical Engineering Mcqs repository? Our repository contains verified multiple choice questions for Chemical Engineering Mcqs, regularly curated and cross-referenced with official past papers from 2018 to 2026. #### Are these Chemical Engineering Mcqs MCQs relevant for 2026 exams? Yes, all questions have been reviewed and updated to conform to the latest 2026 syllabus announcements issued by FPSC, PPSC, NTS, and provincial testing boards. #### Does Chemical Engineering Mcqs practice include answer explanations? Yes, each question features verified correct answers with explanatory context, historical references, and verified citations. #### Can I practice Chemical Engineering Mcqs questions in interactive quiz mode? Yes, click 'Take Chemical Engineering Mcqs Quiz' to launch our Smart Adaptive practice engine, customize question counts, and track your accuracy score in real-time. --- *Source: https://test-prep.blog/categories/chemical-engineering-mcqs?page=26* *Format: Markdown for Agents (Content Negotiation: text/markdown)*