A short chain is sometimes attached to the back of a petrol tanker to…
A short chain is sometimes attached to the back of a petrol tanker to
A. Conduct excess charges to the earth
B. Ensure the balancing of the tanker
C. Caution the driver when over speeding
D. Generate more friction
As the air surrounding a travelling petrol tanker rubs and creates friction with the walls of the tank, charges could be accumulated. Now a chain is usually attached to the back of the tanker in order to conduct and discharge any risky excess charges to the earth.
Now for the right answer to the above question:
- Option A is correct.
- Option B is incorrect. not for balance.
- C is incorrect. wrong. not to prevent over speeding.
- D is not the correct answer. unreasonable option.
You may please note these/this:
- Accumulated charges could cause explosive hazards, this is why there is need to earth them through the dangling chains.
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/ culled from 2015 JAMB-UTME physics question 34 /
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