Ans . A carpet is a poor conductor of heat whereas the floor on which it is placed is a much better conductor . The bare floor conducts heat from your feet and hence the floor feels cold to your feet .
Q . Why do mosquito buzz louder as the temperature goes up ?
Ans . The buzzing of a mosquito is a noise made by the rapid vibration of its wings which beat at 250 to 600 strokes a second . A mosquito achieves this rapid wingbeat by activating special muscles in its midsection which automatically contract and relax at incredible speed . The warmer the environment, the more active the mosquito become . As the temperature goes up, the wing vibration, along with other body activities, is stepped up the buzzing becomes louder .
Q . How is it that our weight decreases on moon ?
Ans . Our weight is due to the force exerted by EARTH on us - the force of gravity . The MOON has one-sixth the gravity of the earth and so our weight on moon is one sixth our weight on the earth. So if you are 42 Kg on EARTH , you will weigh just 7 Kg on the MOON.
Q . Why is Brass used in statues ?
Ans . Brass, which is an Alloy of copper and zinc, is used in statues because it is a metal that can be hammered, chased (or punched)and moulded into shape without the danger of it breaking up. It is also used for its hardness and long lasting quality
Q . If a bird gets wet, it becomes dry very soon. Why ?
Ans . When a bird gets wet, it shakes itself vigorously to get rid of the water on the surface of it's body . Besides, you must have often seen birds preening themselves . At the back of the body near the tail are oil glands. While preening, the bird nibbles at these glands and spread their secretion over the feathers. This oil makes the bird's plumage waterproof .
