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  • Question

  • 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?


  • Options
  • A. 5
  • B. 10
  • C. 15
  • D. 20

  • Correct Answer
  • 10 

    • More questions

    • 1. Pick out the correct statement.

    • Options
    • A. Deforestation helps in controlling the green house effect.
    • B. Global warming is detrimental for increase in food productivity and may cause flood and cyclone.
    • C. Lightening discharges are natural source of production of SO2 & H2S pollutant.
    • D. Sulhur dioxide causes death by asphyxiation.
      • Discuss
    • 2. __________ atmosphere is maintained inside an iron blast furnace.

    • Options
    • A. Oxidising
    • B. Reducing
    • C. Inert
    • D. Decarburising
      • Discuss
    • 3. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies

    • Options
    • A. 0 < Xw < 0.5
    • B. Xw = 0.5
    • C. 0.5 < Xw < 1.0
    • D. Xw = 1.0
      • Discuss
    • 4. Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.

    • Options
    • A. polyurathane
    • B. polysulphone
    • C. polycarbonate
    • D. polyester
      • Discuss
    • 5. The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mmHg.

    • Options
    • A. 1.2
    • B. 12
    • C. 120
    • D. 700
      • Discuss
    • 6. Buna-S is also called

    • Options
    • A. polyurathane
    • B. SBR
    • C. teflon
    • D. bakelite
      • Discuss
    • 7. Dead zone in an instrument must be less than __________ percent of the scale.

    • Options
    • A. 0.2
    • B. 1.5
    • C. 4
    • D. 8
      • Discuss
    • 8. Fireclay bricks are used in the

    • Options
    • A. furnaces allowed to cool frequently
    • B. flues
    • C. chimney linings
    • D. all (a), (b) and (c)
      • Discuss
    • 9. Aniline point of high speed diesel may be about __________ °C.

    • Options
    • A. 35
    • B. 70
    • C. 105
    • D. 150
      • Discuss
    • 10. Ebonite is a/an

    • Options
    • A. highly vulcanised rubber.
    • B. natural rubber.
    • C. unvulcanised raw rubber.
    • D. adhesive.
      • Discuss

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