When light travels from a less dense medium to a more dense medium it:

Slows down and bends toward the normal

Speeds up and bends away from the normal

Slows down and bends toward the normal

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?

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

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:

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

Sodium sulfate — because sulfate ions react with barium to form white precipitate

Ammonium carbonate — because the ammonia test is positive and chloride test is negative

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

Sodium chloride — because chloride is present but no ammonium

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

Spinal cord motor pathways leading to paralysis in severe cases

The optic nerve exclusively in every case

Only the inner ear balance nucleus

Skeletal muscles without any neural involvement

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 catalytic cycle where the chlorine atom is regenerated after each reaction

A single displacement reaction converting ozone to oxygen permanently

A polymerization chain where ozone molecules join together

An acid-base reaction between chlorine and ozone molecules

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?

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

CO is converted to CH4 and NOx is converted to HNO3 by the platinum catalyst

CO reacts with NOx to form carbonate compounds that are stored in the catalyst

CO is absorbed by the platinum surface and NOx is dissolved in water condensed in the exhaust

Sindh PMS Screening Test Everyday Science: Past Papers MCQs with Answers

Practise Sindh PMS Screening Test Everyday Science past papers MCQs in sets of about 20 questions with instant answers and explanations. This page focuses on questions drawn from previous exam papers and official patterns, helping you build accuracy and speed for the actual Sindh PMS Screening Test paper.

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Sample Sindh PMS Screening Test Everyday Science past papers questions

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
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
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
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
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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