A skilled gunman always keeps his gun slightly tilted above the line of sight while shooting. Why?

Statement-1: You see a geostationary satellite above the horizon. You desire to communicate with the satellite by sending a beam of laser light. You should aim your laser slightly higher than the line of sight of the satellite. Statement-2: Light bends away from the normal while moving from denser to rarer medium.

While firing, a gun man has to hold the gun tightly against his shoulder. Why?

Statement-1 : For rotational equilibrium of floating bodies, meta centre must always be lower than centre of gravity of the body Statement-2 : When a floating body is slightly tilted from equilibrium , centre of buoyance shifts. The vertical line passing through new centre of buoyance and initial vertical line meet at a point, which is called meta centre.

Mr. Firoze is a retired man who lives in a big house. He has recently replaced all the filament-type bulbs in his house by CFls. His wife and children have a habit of keeping the lights and fans on (even when there is no one in the room) but Mr. Firoze keeps on going to every room periodically to switch them off. A few days back Mr. Firoze had purchased a device which can cook rice and dal without using any usual fuel. He has also installed an equipment on the roof of his house to obtain hot water. Mr. Firoze uses bicycle for short distances like going to nearby market, instead of scooter or car. (a) What is CFL ? Why has Mr. Firoze replaced all the filament-type bulbs in his big house by CFLs ? (b) Why does Mr.Firoze keep switching off lights and fans when no one is in the rooms ? (c) Name the device which Mr. Firoze has purchased to cook rice and dal without using any usual fuel ? (d) Name the equipment which Mr. Firoze has installed on the house-roof to obtain hot water ? (e) Why does Mr. Firoze use bicycle for going through short distances ? (f) What values are displayed by Mr. Firoze by all the above actions ?