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NTS MCQs

National Testing Service — Complete MCQ Bank

1,084 Questions
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221
Chemistry Medium

What is the name of the horizontal rows in the periodic table?

  • AGroups
  • BBlocks
  • CPeriods
  • DFamilies
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Correct Answer: Option C — Periods
Explanation: Periods are the horizontal rows in the periodic table and elements in the same period have the same number of electron shells with properties changing systematically across each period.
Submitted by: PaperMCQs
222
Chemistry Medium

Which process separates a mixture of liquids based on their different boiling points?

  • ADistillation
  • BFiltration
  • CCrystallisation
  • DChromatography
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Correct Answer: Option A — Distillation
Explanation: Distillation separates mixtures of liquids with different boiling points by heating the mixture and selectively condensing and collecting vapours of the lower boiling point component.
Submitted by: PaperMCQs
223
Chemistry Medium

What is the chemical formula for glucose, the primary energy source for cells?

  • AC6H10O5
  • BC12H22O11
  • CC6H12O6
  • DC6H6O6
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Correct Answer: Option C — C6H12O6
Explanation: Glucose has the chemical formula C6H12O6 and is a monosaccharide sugar that serves as the primary energy source for cellular respiration in living organisms.
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224
Chemistry Easy

Which element is a liquid at room temperature and is used in thermometers?

  • ABromine
  • BGallium
  • CMercury
  • DCaesium
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Correct Answer: Option C — Mercury
Explanation: Mercury is a metal that remains liquid at room temperature with a melting point of minus 38.8 degrees Celsius and has been traditionally used in thermometers and barometers.
Submitted by: PaperMCQs
225
Chemistry Easy

What is the chemical formula for ammonia?

  • ANO2
  • BN2H4
  • CNH3
  • DNH4
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Correct Answer: Option C — NH3
Explanation: Ammonia has the chemical formula NH3 consisting of one nitrogen atom bonded to three hydrogen atoms and is widely used in fertiliser production and as a cleaning agent.
Submitted by: PaperMCQs
226
Chemistry Easy

Which acid is found naturally in vinegar?

  • AAcetic acid
  • BSulfuric acid
  • CHydrochloric acid
  • DCitric acid
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Correct Answer: Option A — Acetic acid
Explanation: Acetic acid also known as ethanoic acid is the organic acid found in vinegar at concentrations of 4 to 8 percent giving it its characteristic sour taste and pungent smell.
Submitted by: PaperMCQs
227
Chemistry Medium

What is the valency of carbon that makes it the basis of organic chemistry?

  • A2
  • B3
  • C4
  • D6
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Correct Answer: Option C — 4
Explanation: Carbon has a valency of 4 meaning it can form four covalent bonds with other atoms allowing it to create an enormous variety of organic compounds through chains and rings.
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228
Chemistry Medium

Which type of chemical reaction involves a substance combining with oxygen to release energy?

  • AReduction
  • BOxidation
  • CNeutralisation
  • DDecomposition
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Correct Answer: Option B — Oxidation
Explanation: Oxidation involves the combination of a substance with oxygen releasing energy often as heat and light as seen in combustion reactions such as burning wood or fuels.
Submitted by: PaperMCQs
229
Chemistry Easy

What is the lightest element in the periodic table?

  • AHelium
  • BHydrogen
  • CLithium
  • DBeryllium
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Correct Answer: Option B — Hydrogen
Explanation: Hydrogen is the lightest and simplest element in the periodic table with atomic number 1 consisting of one proton and one electron in its most common form.
Submitted by: PaperMCQs
230
Chemistry Easy

Which element has the chemical symbol Fe?

  • AFluorine
  • BIron
  • CFrancium
  • DFermium
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Correct Answer: Option B — Iron
Explanation: The chemical symbol Fe for iron comes from the Latin word Ferrum and iron is a transition metal with atomic number 26 widely used in construction and manufacturing.
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