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NTS MCQs

National Testing Service — Complete MCQ Bank

262 Questions
Exam Preparation Guide

How to prepare for NTS

NTS tests evaluate aptitude, analytical reasoning, quantitative ability, English and subject knowledge for admissions, scholarships and recruitment.

EnglishQuantitative SkillsAnalytical ReasoningSubject Knowledge
Practice under a timer and review weak areas after every test to improve both speed and accuracy.
NTS preparation illustration
211

Which property of water allows insects like water striders to walk on its surface?

  • AViscosity
  • BSurface tension
  • CDensity
  • DCapillarity
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Correct Answer: Option B — Surface tension
Explanation: Surface tension is the cohesive force between water molecules at the surface that creates a thin elastic like layer allowing lightweight insects such as water striders to walk on water.
Submitted by: PaperMCQs
212

Which gas is responsible for the characteristic smell often associated with rain after a dry spell?

  • AMethane
  • BOzone
  • CPetrichor compounds
  • DSulfur dioxide
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Correct Answer: Option C — Petrichor compounds
Explanation: The distinctive earthy smell after rain known as petrichor is caused by plant oils geosmin released by soil bacteria and ozone combining in the air during rainfall.
Submitted by: PaperMCQs
213

Which everyday chemical reaction is responsible for rusting of iron objects?

  • AOxidation
  • BReduction
  • CNeutralization
  • DSublimation
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Correct Answer: Option A — Oxidation
Explanation: Rusting is an oxidation reaction where iron reacts with oxygen and moisture in the air forming iron oxide which weakens and corrodes metal structures over time.
Submitted by: PaperMCQs
214

Which scale is used to estimate wind speed based on observed sea or land conditions without instruments?

  • ARichter scale
  • BBeaufort scale
  • CFujita scale
  • DSaffir-Simpson scale
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Correct Answer: Option B — Beaufort scale
Explanation: The Beaufort scale estimates wind speed by observing its effects on sea waves and land conditions providing a practical method for assessing wind force without specialized instruments.
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215

Which scale is commonly used to measure the intensity of hurricanes and tropical cyclones?

  • ARichter scale
  • BSaffir-Simpson scale
  • CBeaufort scale
  • DFujita scale
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Correct Answer: Option B — Saffir-Simpson scale
Explanation: The Saffir-Simpson scale categorizes hurricanes into five categories based on sustained wind speed helping predict potential damage and guide disaster preparedness measures.
Submitted by: PaperMCQs
216

Which natural disaster is measured using the Richter scale?

  • AHurricanes
  • BEarthquakes
  • CFloods
  • DTornadoes
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Correct Answer: Option B — Earthquakes
Explanation: The Richter scale is used to measure the magnitude of earthquakes based on the amplitude of seismic waves recorded by seismographs at monitoring stations.
Submitted by: PaperMCQs
217

Which water purification process removes dissolved salts and impurities by forcing water through a semi-permeable membrane?

  • AChlorination
  • BReverse osmosis
  • CBoiling
  • DUV purification
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Correct Answer: Option B — Reverse osmosis
Explanation: Reverse osmosis forces water through a semi-permeable membrane under pressure removing dissolved salts and impurities producing cleaner and safer drinking water.
Submitted by: PaperMCQs
218

Which household water purification method uses ultraviolet light to kill bacteria and viruses?

  • AReverse osmosis
  • BUV purification
  • CBoiling
  • DChlorination
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Correct Answer: Option B — UV purification
Explanation: UV purification systems use ultraviolet light to destroy the DNA of bacteria viruses and other pathogens in water making it safe for drinking without altering its taste.
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219

Which preservation technique uses controlled heating to kill harmful microorganisms in liquids like milk?

  • ADehydration
  • BPasteurization
  • CFermentation
  • DCanning
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Correct Answer: Option B — Pasteurization
Explanation: Pasteurization involves heating liquids like milk to a specific temperature for a set time to kill harmful microorganisms while preserving nutritional quality and extending shelf life.
Submitted by: PaperMCQs
220

Which common food preservation method works by removing moisture to inhibit bacterial growth?

  • ARefrigeration
  • BDehydration
  • CPasteurization
  • DFreezing
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Correct Answer: Option B — Dehydration
Explanation: Dehydration preserves food by removing moisture content which inhibits the growth of bacteria fungi and other microorganisms that require water to survive and multiply.
Submitted by: PaperMCQs