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Contact lenses are made from ?

  • Polyvinyl chloride
  • Teflon
  • Polystyrene
  • Lucite

Answer: Option A

Similar Questions :

1. Atomic number is equal to

  • Number of electrons
  • Number of nutron
  • Number of protons
  • Total number of protons and neutrons

Answer: Option C

2. The isotope atoms differ in ?

  • number of neutrons
  • atomic number
  • number of electrons
  • atomic weight

Answer: Option A

Explanation:

Important to note that isotope atoms have same atomic number.

3. What is a mixture of potassium nitrate powdered charcoal and sulphur called?

  • paint
  • aluminium
  • brass
  • gun powder

Answer: Option D

Explanation:

gun powder is the mixture of potassium nitrate powdered charcoal and sulphur.

4. The nuclear particles which are assumed to hold the nucleons together are ?

  • positrons
  • neutrons
  • electrons
  • mesons

Answer: Option D

5. What nucleus of atom contains ?

  • protons
  • electrons
  • electrons and protons
  • protons and neutrons

Answer: Option D

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