М. М. Кутепова The World of Chemistry Мир

What does the passage mainly discuss?

1. 
   the importance of plastics c) various uses of plastics
   

in the Second World War d) people’s attitude toward new

2. 
   plastics as substances material
   

2. 
   According to the passage, materials which can be softened by heat and moulded into a desired shape are called...
   

1. 
   thermoplastics c) thermosets
   
2. 
   ebonites d) resins
   

3. 
   According to the passage, when was bakelite discovered?
   

1. 
   in 1807 c) in 1907
   
2. 
   in 1927 d) in 1901
   

4. 
   According to the passage, what is the principal agent incorporated into plastics?
   

1. 
   resins c) catalysts
   
2. 
   antioxidants d) stabilizers
   

5. 
   Which of the following will be least useful if it were made from thermoplastics?
   

1. 
   a vase of flowers c) a table
   
2. 
   a doorknob d) a coffee cup
   

6. 
   The paragraph following the passage most probably discusses
   

1. 
   celluloid and its characteri- c) the properties of thermosetting
   

sties plastics

2. 
   the properties of plastics d) the uses of plastics
   

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Section 2

In this section of the test each problem consists of an incomplete sentence. Below the sentence there are four choices, marked (a), (b), (c) and (d). You should find the one choice that best completes the sentence.
Example: Carbon ... to occur in two crystalline forms.

1. 
   know c)knows
   
2. 
   is known d) it is known