Physics
Should cars have bumpers that collapse under impact?

Yes, since they help to absorb the impact of a collision and keep the occupants safe
No, since it would be very expensive to get the car repaired
Yes, since the offending car should get damaged and pay for the mistake
No, since the colliding car would then ram into the occupants and kill them

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a good conductor of heat as well as electricity
a good conductor of heat but a bad conductor of electricity
a bad conductor of heat but a good conductor of electricity
a bad conductor of heat as well as electricity

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