21. Which of the following is produced by condensation polymerisation?
22. Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.
23. Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.
24. Dies for wire drawing are generally made of
25. High resistance electrical heating elements/wire are not made of
26. The material used in the filament of electric bulbs is
27. The main purpose of galvanising iron sheets is to
28. Which of the following metals in not used for coating of the base metal to guard it against corrosion?
29. __________ is a donor impurity for semi-conductors.
30. Hydrochloric acid is stored in a __________ steel vessel.
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