In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains
A. Length of heating element should be decreased
B. Length of heating element should be increased
C. Length of heating element has no effect on heating if water
D. None of the above
Answer: Option A
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Resistance of a material always decreases if
A. Temperature of material is decreased
B. Temperature of material is increased
C. Number of free electrons available becomes more
D. None of the above is correct
The minimum charge on an ion is
A. Equal to the atomic number of the atom
B. Equal to the charge of an electron
C. Equal to the charge of the number of electrons in an atom
D. Zero
Current velocity through a copper conductor is
A. the same as propagation velocity of electric energy
B. independent of current strength
C. of the order of a few micro m/s
D. nearly 3 x 108 m/s
Resistance of a tungsten lamp as applied voltage increases