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What is used to avoid melting of ice ?

  • Gelatine
  • Butane
  • Methane
  • Any acid

Answer: Option A

Similar Questions :

1. Conduction band electrons have more mobility than holes because they are

  • experience collision more frequently
  • experience collision less frequently
  • have negative charge
  • need less energy to move them

Answer: Option B

2. What nucleus of atom contains ?

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

Answer: Option D

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. Air is a

  • compound
  • colloid
  • element
  • mixture

Answer: Option D

5. Which of the following is produced during the formation of photochemical smog ?

  • Nitrogen Oxides
  • Hydrocarbons
  • Methane
  • Ozone

Answer: Option D

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