Question

Give reasons
1. Liquid pressure varies with depth.
2. A balloon bursts if too much air is blown into it.
3. The pillars of bridges and flyovers have a broad base.
4. The foundation of high rise building is strong and wide.
5. Tiny bits of paper get attracted when brought close to a balloon.

Answer 1

if we take a bucket and make a hole at the bottom and at the top the water flows with a great pressure from the bottom hole.
2. a balloon bursts if too much air is blown into it because the pressure and volume inside the balloon increases

Answer 2

1 liquid pressure increases with depth because the weight of water over the body also apply pressure on body
2. Every material have same limits when the material reaches to the ultimate stress then it fail in Balloon case the inner pressure is higher than the ultimate stress or pressure
3. The pillars of bridges have a broad base. Because the all loads carried by the bridge is supported by them if u wanna read about it more than go for strength of material book and chapter shear force diagram and bending moment diagram
4. Same concept as in 3 question