Exercise 2

Question 6 :

The material which can be deformed permanently by heat and pressure is called a

A). thermoplastic
B). thermoset
C). chemical compound
D). polymer
Answer : Option B

Question 7 :

The mass number of a nucleus is

A). always less than its atomic number
B). the sum of the number of protons and neutrons present in the nucleus
C). always more than the atomic weight
D). a fraction
Answer : Option B

Question 8 :

The inexpensive and commonly used variety of glass is called soda glass. It is called so because

A). was used initially for making bottles of soda(carbonated drink)
B). is made using soda(sodium carbonate)
C). was initially used for storing sodium carbonate
D). is made using soda lime
Answer : Option B

Question 9 :

The gas used in the manufacture of vanaspati from vegetable oil is

A). hydrogen
B). oxygen
C). nitrogen
D). carbon dioxide
Answer : Option A

Question 10 :

The graphite rods in the nuclear reactor

A). react with U to release energy
B). produce neutrons
C). undergo combustion which triggers the nuclear fission
D). convert fast moving neutrons into thermal neutrons
Answer : Option D