Ans . C
Q.2 Which one of the following is used as a filter in rubber tyres?
D. Carbon black
Q.3 Which one of the following polymeric matreials is used for making bullet proof jacket?
A. NYLON 6.6
Q.4 Which alloy contains nickel?
Q.5 Which one of the following elements is not present in stainless steel?
Q.6 Bronze is an alloy of
A. Tin and zinc
B. Iron and zinc
C. Copper and zinc
D. Copper and tin
Q.7 Which of the following is a super cooled liquid?
D. Ice cream
Q.8 Normal valency of nitrogen is
Q.9 The isotope atoms differ in
A. atomic number
B. number of protons
C. number of electrons
D. atomic weight
Q.10 Nucleus of an atom contains
C. electrons and protons
D. protons and neutrons
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