Why is tungsten used in electric bulbs?
A. It has a low melting point
B. It has a high melting point
C. It has high vapor pressure
D. It is resonant or sonorous
Answer: Option B
A. It has a low melting point
B. It has a high melting point
C. It has high vapor pressure
D. It is resonant or sonorous
Answer: Option B
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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