All the respected senior members are requested to post the scientific reasons for the questions given below . Especially the moderators are requested to do the needful ! I could not found them in my book .

Q.1) Why the front wheels of vehicle lean outwards slightly ?
Q.2) Why do peoples voices sound differently ?
Q.3) why is it easier to push a heavy grass mover than to lift it ?
Q.4) Why is an electric bulb less efficient than a fluorescent tube ?
Q.5)How does the pouring of kerosene oil on stagnant on stagnant water contribute to the eradication of malaria ?
Q.6)Why is it dangerous to have charcoal fire burning in a badly ventilated room ?
Q.7)The works output of a machine is always equal to the work input ?
Q.8)All motions are relative to one another ?
Q.9)Gravity of all the objects is same, regardless of their mass of at a give point on the earth's surface.?
Q.10)Why do you hear thunder after and see flash of light first ?
Q.11)why a bomber does not drop bomb when it is vertically above the target ?
Q.12)Transmission lines carry very high voltages ?
Q.13)A ball dropped vertically on the ground does not rise to its original height ?
Q.14)More stirring is needed when sugar is dissolved in cold cofee than in hot coffee ?
Q.15)Lunar eclipse lasts much longer than solar eclipse ?
Q.16)Goiter is common among people living in hilly areas ?
Q.17)Detergents are better cleaning agent as compared to soaps ?
Q.18) decomposers are imp for life and land and water ?
Q.19)Places near the sea are cooler in summer and warmer in winter than places farther in-land ?
Q.20)A 25 watts incandescent bulb provides much less light than a 25 watts fluorescent tube light ?

These questions aforementioned are from past papers , Every one is requested to please spare some time to figure them out !
take care

__________________
Devil-may-care