A) Works intermittently when it roller slips on tyre
B) Small electronic gadgets can be charged
C) Can be easily disengaged during day time
D) Requires no fuel
Correct Answer: A
Solution :
Option [a] is correct. Explanation: In wet conditions, the roller on a bottle dynamo (old model or new model) can silp against the surface of the tyre, which interrupts the electricity generated. This causes the lights to go out intermittently. This is not an advantage.
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