Question: Which of these is used to repel moths?
A.Naphthalene balls 
C.Coal gas
D.Paraffin wax
Answer: Option A
: A

Naphthalene or mothballis awhite solid with a pungent odour derived from thedistillationofcoal tar. It sublimesinto a pungent toxic smell whichdrives away insects and moths.

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Question 1. Identify the term that is used for the unprocessed oil that comes out of the ground. 
  1.    Petrol
  2.    Petroleum
  3.    Kerosene
  4.    Diesel
Answer: Option B
: B

Petroleum or crude oil is anaturally occurring liquidfound deep inside the Earth, which is commonly refined into various types offuels. Components of petroleum are separated using a technique calledfractional distillation. Petrol, diesel, kerosene are few of the many components of petroleum.
Question 2. Which of the following variety of coal is a heterogeneous mixture of decomposed plant material that is accumulated in water and in the absence of air?
  1.    Anthracite
  2.    Lignite
  3.    Peat
  4.    Bituminuous
Answer: Option C
: C

Coal is formed when organic material is buried under sediment and exposed to high temperature and pressure for millions of years. The formation of coal takes place in four stages: peat, lignite, bituminous and anthracite coal. Peat is a heterogeneous mixture of more or less decomposed plant material that is accumulated in water, in the absence of air (anaerobic conditions). Peat is the primitive form of coal. The carbon content is least in peat.
Question 3. The substances that are obtained from petroleum and natural gas are called ______.
  1.    petroproducts
  2.    petrochemicals
  3.    petrocompounds
  4.    petromolecules
Answer: Option B
: B

Petrochemicals are the chemical compounds derived from petroleum and natural gas. Products such as gasoline, fertilisers, cosmetics, etc. are products made from or with the aid of petrochemicals.
Question 4. Anthracite is the grade of coal that has the lowest carbon content.
  1.    True
  2.    False
Answer: Option B
: B

Anthracite is the grade of coal that has the highest percentage of carbon followed by bituminous coal, lignite and peat. Higher the grade of a coal, lower is its ash content and thus greater combustibility.
Question 5. Kerosene is not a fossil fuel.
  1.    True
  2.    False
Answer: Option B
: B

Fossil fuels are formed when dead plants and animals undergo decomposition under high pressure and temperature for a long period of time.

Petroleum is formed when dead sea organisms undergo decomposition at high temperature and pressure. Petrol, diesel and kerosene are products that are obtained by refining petroleum. Hence, kerosene is also a fossil fuel.
Question 6. Natural gas is mostly made up of ______.
  1.    methane
  2.    propane
  3.    butane
  4.    ethane
Answer: Option A
: A

Natural gas is made up of hydrocarbons such as methane, ethane, propane, etc. Among these, methane makes up a major percentage of natural gas; while others are present in lesser percentage.

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