General Science Questions and Answers

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Q21
Among the various allotropes of carbon,
  • A coke is the hardest, graphite is the softest
  • B diamond is the hardest, coke is the softest
  • C diamond is the hardest, graphite is the softest
  • D diamond is the hardest, lamp black is the softest
Answer: Option C
Q22
The group of metals Fe, Co, Ni may best called as
  • A transition metals
  • B main group metals
  • C alkali metals
  • D rare metals
Answer: Option A
Q23
Heavy water is
  • A deuterium oxide
  • B PH7
  • C rain water
  • D tritium oxide
Answer: Option A
Q24
The chemical (ethyl merceptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
  • A bromine
  • B fluorine
  • C chlorine
  • D sulphur
Answer: Option C
Q25
The element common to all acids is
  • A hydrogen
  • B carbon
  • C sulphur
  • D oxygen
Answer: Option A
Q26
Non stick cooking utensils are coated with
  • A Teflon
  • B PVC
  • C black paint
  • D polystyrene
Answer: Option A
Q27
Monazite is an ore of
  • A titanium
  • B zirconium
  • C iron
  • D thorium
Answer: Option D
Q28
Carbon, diamond and graphite are together called
  • A allotropes
  • B isomers
  • C isomorphs
  • D isotopes
Answer: Option A
Q29
Potassium nitrate is used in
  • A medicine
  • B fertiliser
  • C salt
  • D glass
Answer: Option B
Q30
Permanent hardness of water may be removed by the addition of
  • A sodium carbonate
  • B alum
  • C potassium permanganate
  • D lime
Answer: Option A

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