Physics
In the case of bodies falling under gravity which of the following remains constant at a given place?

Acceleration
Potential energy
All listed here
Kinetic energy

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Physics
In a conductor

The valence band and the conduction band overlap each other
The forbidden energy gap is very wide
The forbidden energy gap is very narrow
There is no conduction band

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Physics
Should cars have bumpers that collapse under impact?

Yes, since the offending car should get damaged and pay for the mistake
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
No, since the colliding car would then ram into the occupants and kill them

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Physics
It takes much longer to cook food in the hills than in the plains, because

due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
n the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

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