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NTS MCQs

National Testing Service — Complete MCQ Bank

63 Questions
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11
Chemistry Medium

Which element is a semiconductor and is the main component of computer chips?

  • ACarbon
  • BGermanium
  • CSilicon
  • DGallium
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Correct Answer: Option C — Silicon
Explanation: Silicon is a semiconductor element with atomic number 14 and is the primary material used in computer chips integrated circuits and solar cells due to its controllable conductivity.
Submitted by: PaperMCQs
12
Chemistry Medium

What is the chemical formula for washing soda used in cleaning?

  • ANaHCO3
  • BNaCl
  • CNa2CO3
  • DNaOH
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Correct Answer: Option C — Na2CO3
Explanation: Washing soda is sodium carbonate Na2CO3 a water softener and cleaning agent used to remove grease and stains and is also used in glass making and paper production.
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13
Chemistry Medium

Which type of reaction absorbs energy from the surroundings causing the temperature to fall?

  • AEndothermic
  • BExothermic
  • CDisplacement
  • DCombustion
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Correct Answer: Option A — Endothermic
Explanation: Endothermic reactions absorb energy from their surroundings causing a temperature decrease as more energy is required to break bonds in reactants than is released forming products.
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14
Chemistry Medium

Which type of reaction releases energy to the surroundings causing the temperature to rise?

  • AEndothermic
  • BReversible
  • CEquilibrium
  • DExothermic
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Correct Answer: Option D — Exothermic
Explanation: Exothermic reactions release energy to the surroundings causing a temperature rise as bonds formed in products are stronger than bonds broken in reactants such as combustion.
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15
Chemistry Easy

What is the SI unit of the amount of substance in chemistry?

  • AGram
  • BLitre
  • CKilogram
  • DMole
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Correct Answer: Option D — Mole
Explanation: The Mole is the SI unit for the amount of substance and one mole of any substance contains approximately 6.022 x 10 to the power 23 particles.
Submitted by: PaperMCQs
16
Chemistry Medium

Which type of reaction occurs when a more reactive metal displaces a less reactive metal from its salt solution?

  • ADecomposition
  • BNeutralisation
  • CCombustion
  • DDisplacement
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Correct Answer: Option D — Displacement
Explanation: Displacement reactions occur when a more reactive metal replaces a less reactive metal from its salt solution as seen when iron displaces copper from copper sulfate solution.
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17
Chemistry Medium

Which polymer is used to make plastic water bottles and is identified by recycling code 1?

  • APET polyethylene terephthalate
  • BPVC
  • CPolystyrene
  • DPolypropylene
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Correct Answer: Option A — PET polyethylene terephthalate
Explanation: PET or polyethylene terephthalate is the plastic used to make water bottles and food packaging and is identified by the recycling code 1 on containers.
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18
Chemistry Medium

What is the chemical name of aspirin widely used as a pain reliever?

  • AParacetamol
  • BAcetylsalicylic acid
  • CIbuprofen
  • DSalicylic acid
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Correct Answer: Option B — Acetylsalicylic acid
Explanation: Aspirin is the brand name for acetylsalicylic acid synthesised by acetylating salicylic acid and has analgesic anti-inflammatory and antiplatelet properties.
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19
Chemistry Easy

What is the chemical formula for hydrogen peroxide commonly used as an antiseptic?

  • AH2O2
  • BH2O
  • CH3O2
  • DHO2
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Correct Answer: Option A — H2O2
Explanation: Hydrogen peroxide H2O2 is a pale blue liquid used as an antiseptic bleaching agent and rocket propellant differing from water by having an extra oxygen atom.
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20
Chemistry Medium

Which reaction type involves the breaking of a large molecule into smaller ones?

  • ASynthesis
  • BDisplacement
  • CDecomposition
  • DNeutralisation
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Correct Answer: Option C — Decomposition
Explanation: Decomposition reactions break down a single compound into two or more simpler substances often using heat electricity or light as in the thermal decomposition of calcium carbonate.
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