PMS Competitive (General) Everyday Science: Past Papers MCQs with Answers

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Sample PMS Competitive (General) Everyday Science past papers questions

1. Q1. An electric utility installs advanced metering infrastructure (smart meters) that record electricity consumption every 15 minutes. A consumer challenges her bill, claiming the meter overcharged her. She used a 2 kW heater for 3 hours, a 100 W refrigerator continuously, and a 500 W television for 4 hours in a 24-hour period. What is her correct total consumption in units (kWh) for that day?

   • A) 8.4 kWh
   • B) 9.6 kWh
   • C) 10.4 kWh
   • D) 11.0 kWh — calculated as heater (2 kW × 3 h = 6 kWh) + refrigerator (0.1 kW × 24 h = 2.4 kWh) + television (0.5 kW × 4 h = 2.0 kWh) + approximately 0.6 kWh for other standby loads = 11.0 kWh total

   Answer: 10.4 kWh

2. Q2. A chemistry student is asked to identify an unknown white solid. She dissolves it in water and tests with silver nitrate solution — a white precipitate forms that dissolves in dilute ammonia. She adds dilute H2SO4 and barium chloride — no precipitate forms. She adds NaOH and warms — ammonia gas is released turning damp red litmus paper blue. The unknown substance is:

   • A) Sodium sulfate — because sulfate ions react with barium to form white precipitate
   • B) Ammonium carbonate — because the ammonia test is positive and chloride test is negative
   • C) Ammonium chloride — because the white precipitate soluble in ammonia confirms chloride ions and the NaOH test confirms ammonium ions
   • D) Sodium chloride — because chloride is present but no ammonium

   Answer: Ammonium chloride — because the white precipitate soluble in ammonia confirms chloride ions and the NaOH test confirms ammonium ions

3. Q3. Polio vaccines help the body block the virus from damaging mainly which part of the nervous system?

   • A) Spinal cord motor pathways leading to paralysis in severe cases
   • B) The optic nerve exclusively in every case
   • C) Only the inner ear balance nucleus
   • D) Skeletal muscles without any neural involvement

   Answer: Spinal cord motor pathways leading to paralysis in severe cases

4. Q4. A researcher studying ozone depletion explains that CFCs (chlorofluorocarbons) from old refrigerants are responsible for destroying the ozone layer. She describes how a single chlorine atom from a CFC can destroy thousands of ozone molecules. What type of chemical process describes this chain reaction?

   • A) A catalytic cycle where the chlorine atom is regenerated after each reaction
   • B) A single displacement reaction converting ozone to oxygen permanently
   • C) A polymerization chain where ozone molecules join together
   • D) An acid-base reaction between chlorine and ozone molecules

   Answer: A catalytic cycle where the chlorine atom is regenerated after each reaction

5. Q5. An environmental chemist studies the catalytic converter in a car exhaust system. She explains that it converts harmful CO and NOx gases into less harmful products. The converter contains platinum and rhodium catalysts on a ceramic honeycomb. What chemical reactions occur inside the catalytic converter?

   • A) CO is oxidized to CO2 and NOx is reduced to N2 gas using the platinum-rhodium surface as catalyst
   • B) CO is converted to CH4 and NOx is converted to HNO3 by the platinum catalyst
   • C) CO reacts with NOx to form carbonate compounds that are stored in the catalyst
   • D) CO is absorbed by the platinum surface and NOx is dissolved in water condensed in the exhaust

   Answer: CO is oxidized to CO2 and NOx is reduced to N2 gas using the platinum-rhodium surface as catalyst

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