Physics
In a diesel engine the high temperature needed to ignite the fuel is achieved by

Using heat from exhaust
Compressing air in the cylinders
An electrical spark
The battery

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

They fall with same ultimate velocity
Their velocity increases and they fall with same velocity on the earth
They fall with that ultimate velocity, which are different for different droplets
Their velocity increases and they fall with different velocity on the earth

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