Vehicles carrying highly inflammable materials have chains hanging to the ground. Why is it so?

a. A comb run through one's dry hair attracts small bits of paper. Why? What happens if the hair is wet or if it is a rainy day? (Remember, a paper doesn't conduct electricity.) b. Ordinary rubber is an insulator. But special rubber tyres of aircraft are made slightly conducting. Why is this necessary? c. Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion. Why? d. A bird perches on a bare high power line, and nothing happens to the bird. A man standing on the ground touches the same line and gets a fatal shock. Why?

Assertion : Vehicles containing inflammable materials usually have metallic ropes touching the ground during motion. Reason : Charge produced by friction causes fire so, metallic ropes touching the ground for discharging for the safety of vehicles.

Explain i. Oxides of nitrogen have open chain structures while those of phosphorus have closed chain or cage structure. Why is it so? IIustrate with one structural example for each type of oxides or The oxides of phosphorus have cage strućtures but not open ones. ii. Elemental phosphorus does not exist as P_2 as N_2

During sunset , you might have noticed that the western horizon becomes reddish . Why is it so ?

In a nuclear reactor the chain reaction is carried out under controlled conditions. Name the material that is used as control rods in a nuclear reactor.

Immerse the plastic bottle to the bottom of the bucket. Don't you have to exert a force? Why is it so?