NDA CHEMISTRY QUIZ - 35

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Question 1:

Which isotope of hydrogen does not contain neutron?

Question 2:

Hard water is not used for washing clothes or utensils or in irrigating crops. This is because

Question 3:

Which part of a flame does a goldsmith blow for melting gold and silver?

Question 4:

The instant burning of LPG in a gas stove is the example of 

Question 5:

Forest fires are the most common hazards in forests. They are the example of 

Question 6:

60 kg of fuel was completely burnt for an experiment. The amount of heat energy was found to be 1,80,000 kJ. Calculate the calorific value of the fuel?

Question 7:

Although wood has a very high calorific value, we still discourage its use as a fuel because

  1. It cause pollution
  2. It led to deforestation
  3. It led to soil erosion
  4. It produces more ash

Question 8:

Which chemical is used in the rubbing surface provided for matchsticks?

Question 9:

The _________ zone of a flame is the least hot part of the flame.

  1. Inner zone
  2. Middle zone
  3. Luminous zone
  4. Dark zone

Question 10:

Which of the following component of petroleum is used for making ointments, candles and Vaseline?