PMS Competitive (General) Everyday Science: Practice MCQs with Answers

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Sample PMS Competitive (General) Everyday Science practice questions

1. Q1. In plant nutrition, which micronutrient is a component of chlorophyll and is essential for the light reactions of photosynthesis?

   • A) Iron
   • B) Zinc
   • C) Magnesium
   • D) Manganese

   Answer: Magnesium

2. Q2. 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

3. Q3. 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

4. Q4. Ice can be changed to water by:

   • A) Adding more water molecules
   • B) Changing the motion of the water molecules
   • C) Rearranging the atoms in water molecules
   • D) Destroying the atoms in water molecules

   Answer: Changing the motion of the water molecules

5. Q5. Which bedside tool is routinely used to listen to heart and lung sounds?

   • A) Otoscope
   • B) Ophthalmoscope
   • C) Stethoscope
   • D) Sphygmomanometer

   Answer: Stethoscope

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