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NTS MCQs

National Testing Service — Complete MCQ Bank

63 Questions
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41
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
42
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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43
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.
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44
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.
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45
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.
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46
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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47
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.
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48
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.
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49
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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50
Chemistry Easy

What is the name of the process by which a liquid changes to a gas at its boiling point?

  • AVaporisation
  • BSublimation
  • CCondensation
  • DFreezing
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Correct Answer: Option A — Vaporisation
Explanation: Vaporisation is the process by which a liquid changes to a gas at its boiling point when sufficient thermal energy overcomes the intermolecular forces holding liquid molecules together.
Submitted by: PaperMCQs
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