What is common in the working of the devices such as drinking straw, syringe , a dropper and a rubber sucker ?

A woman is enjoying a cold drink while lying on a beach. The acceleration due to gravity at her location is 9.85 m/ s^(8) . What gauge pressure must exist in the woman's mouth if she is drinking through a straw extending 0.085 m above the surface of the drink? (Assume the drink has a density of 1015 kg/ m^(3) .)

(a) What is the source of energy of this sun and other stars ? (b) Describe the working of a hydrogen bomb. (c ) What is common between the sun and a hydrogen bomb ?

If paper is called wood, wood is called straw, straw is called grass, grass is called rubber and rubber is called cloth, what is the furniture made up of? 1) Paper 2) Wood 3) Straw 4) Grass 5) None of these

A man bought a device X which could cook pulses, vegetables and rice without using any fuel like wood, coal, kerosene or LPG, etc. The device did not work at night. It also took a lot of time for cooking. (a) Name the device X. (b) What is the source of energy which cooks food in this device ? (c ) What is the name of the process which traps energy in this device ? (d) State one advantage (other than saving on fuel) of using such a device for cooking food.

What is rubber sucker ? How does it work ? State any one use of a rubber sucker.