Current Electricity

Physics
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A carbon resistor of is to be marked with rings of different colours for its identification. The colour code sequence will be:

A
Yellow-Green-Violet-Gold
B
Violet-Yellow-Orange-Silver
C
Green-Orange-Violet-Gold
D
Yellow-Violet-Orange-Silver
Medium
NEET
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A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves:

A
A combination of cells, galvanometer and resistances
B
Cells
C
Potential gradients
D
A condition of no current flow through the galvanometer
Medium
NEET
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