Tungsten is used for the manufacture of the filament of an electric bulb because it is
A. a good conductor
B. economical
C. malleable
D. has a very high melting point
Answer: Option D
A. a good conductor
B. economical
C. malleable
D. has a very high melting point
Answer: Option D
What will be the total resistance of the three 20-Ω coils connected in series?
A. 40 Ω
B. 20 Ω
C. 60 Ω
D. 800 Ω
Superconductors are substances which
A. conduct electricity at lower temperature
B. offer high resistance to the flow of current
C. offer not resistance to the flow of current
D. conduct electricity at high temperature
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