As we go higher and higher atmospheric pressure _______ (increases / decreases)

Swetha is wearing a sharp edged high heeled footwear. Madhu is wearing a flat footwear. If both the girls are having same weight and both are stepping over your foot, whose footwear will cause more pain to your foot? Why?

Swathi went by car to Ooty last week, when the car was climbing the mountain, her ears popped. She felt uneasy but after some time she felt better. Why did her ears pop when she climbed the mountain?

Kumaran went to a shop near his house on a bicycle. The bicycle made a lot of noise when he pedalled it. After coming home, he applied some oil on some parts of the bicycle. Then there was no noise, why?

We know that friction depends upon mass of the body when we roll down an iron ball and a football on the ground, which ball will travel more distance? Why?