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8th CBSE
IMPORTANT
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In the following diagram, amber and fur are rubbed together resulting in a negatively charged amber and positively charged fur.

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During the process of charging the fur, 

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Important Questions on Some Natural Phenomena

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8th CBSE
IMPORTANT
Aarav and family were on a road trip. They stopped by a roadside eatery for lunch. While waiting for the food, Aarav was playing with the utensils. When he rubbed a plastic spoon on his woollen jumper and held above a mixture of salt and pepper, pepper jumps to the spoon. Choose the best reason for this:
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8th CBSE
IMPORTANT

An electrostatic precipitator is a filterless device that removes polluted particles using the principle of charge attraction and repulsion. Negatively charged polluted gas enters an electrostatic precipitator as shown in this diagram. 

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Which of the following situations is most likely to result in clean gas exiting the precipitator? 

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8th CBSE
IMPORTANT
This high voltage tower has a lightning rod and grounding wire to protect it from damaging lightning strikes. How does a lightning rod work? 
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8th CBSE
IMPORTANT

Antistatic agents are added to some military jet fuels to make them safer to use. 

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These agents impart electrical conductivity to the fuel. How does this prevent a spark-induced explosion?

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8th CBSE
IMPORTANT

Use the following Triboelectric Series table to answer this question. 

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Stroking this cat with which material will negatively charge its fur? 

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8th CBSE
IMPORTANT

This is a typical North American electrical outlet. 

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The two large semi-lunar-shaped holes are called the safety grounds. These connections prevent any build-up of static charge that may occur when an electrical device is plugged into this outlet. What must these grounds be connected in order to work?