Tag: science & technology

Questions Related to science & technology

The hardest substance available on earth is

general knowledge science & technology

  1. Gold

  2. Coal

  3. Diamond

  4. Platinum

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Correct Option: C

The variety of coal in which the deposit contains recognisable traces of the original plant material is
general knowledge science & technology

  1. bitumen

  2. anthracite

  3. lignite

  4. peat

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Correct Option: D

Tetraethyl lead is used as

general knowledge science & technology

  1. pain killer

  2. fire extinguisher

  3. mosquito repellent

  4. petrol additive

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Correct Option: D

Which of the following is used as a lubricant?
general knowledge science & technology

  1. Graphite

  2. Silica

  3. Iron Oxide

  4. Diamond

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Correct Option: A

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
general knowledge science & technology

  1. Argon

  2. Xenon

  3. Helium

  4. Krypton

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Correct Option: C

The gases used in different types of welding would include

general knowledge science & technology

  1. oxygen and hydrogen

  2. oxygen, hydrogen, acetylene and nitrogen

  3. oxygen, acetylene and argon

  4. oxygen and acetylene

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Correct Option: D

The property of a substance to absorb moisture from the air on exposure is called

general knowledge science & technology

  1. osmosis

  2. deliquescence

  3. efflorescence

  4. desiccation

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Correct Option: B

In which of the following activities silicon carbide is used?

general knowledge science & technology

  1. Making cement and glass

  2. Disinfecting water of ponds

  3. cutting very hard substances

  4. Making casts for statues

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Correct Option: C

The average salinity of sea water is
general knowledge science & technology

  1. 3%

  2. 3.5%

  3. 2.5%

  4. 2%

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Correct Option: B

When an iron nail gets rusted, iron oxide is formed
general knowledge science & technology

  1. without any change in the weight of the nail

  2. with decrease in the weight of the nail

  3. with increase in the weight of the nail

  4. without any change in colour or weight of the nail

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Correct Option: C