Water cannot be used to extinguish fire caused by electric current because it may
A. cause electrocution
B. cause hydrolysis
C. cause electrolysis
D. spoil the wiring
Answer: Option A
A. cause electrocution
B. cause hydrolysis
C. cause electrolysis
D. spoil the wiring
Answer: Option A
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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