Physics
Ventilators are provided near the ceiling of the room because

These do not look nice in the lower part
These provide some sunlight in the room
The exhaled warmer air rises up and goes out
These provide cross ventilation in the room

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

A will reach the ground first.
The question is incomplete because the masses of the spheres are not given.
Both the spheres will reach the ground simultaneously.
B will reach the ground first.

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