1.  Which of the following does the concept of material balance based upon? 
a.  Conservation of mass 
b.  Conservation of energy 
c.  Conservation of momentum 
d.  Conservation of Volume 
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Answer: (a).Conservation of mass

2.  The equation of material balance, (Final condition + Sum of outputs) is equal to which of the following? 
a.  Initial condition – Sum of inputs 
b.  Initial condition + Sum of inputs 
c.  Sum of inputs – Initial condition 
d.  None of the mentioned 
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Answer: (b).Initial condition + Sum of inputs

3.  A container has 10 grams of water 5 grams of water is added and 2 grams of water is taken out, what is the final amount of water? 
a.  7 grams 
b.  10 grams 
c.  13 grams 
d.  15 grams 
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Answer: (c).13 grams

4.  10 moles of O₂ is added to 10 moles of H₂, how many moles of H₂O will it produce? 
a.  5 
b.  10 
c.  15 
d.  20 
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Answer: (b).10

5.  A combustion reaction has reactants 1 mole of CxHy and 2 moles of O₂ and products 1 mole of CO₂ and 2 mole of H₂O, what is x + y? 
a.  1 
b.  3 
c.  4 
d.  5 
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Answer: (d).5
