Ans:
1. What is synthetic rubber?
Synthetic rubber made of certain kinds of hydrocarbons. Of these butadiene is the most important. These hydrocarbons are obtained from coal, crude petroleum and alcohol. By the end of the Second World War, the combined production of synthetic rubber by Synthetic rubber is more oil resistant than natural rubber. In the international market, natural rubber is facing severe competition from synthetic rubber.
2.What does the term 'grand Slam' mean?
Grand Slam is a sports term pertaining to a group of matches, Championships etc. in a particular sports and the winning of all these matches. The best known Grand Slams are those in Tennis [the Australian Open, the French Open, the British Open, the French Open, Wimbledon, and the US Open], Golf [the US Open, the British Open, the Masters, and the PGA], and Rugby Union [victories against all opposition in the competition between England Wales, France, Ireland and Scotland].
3. Who discovered oxygen?
Joseph Priestly discovered oxygen, the colourless, odorless, gaseous chemical element forming about 20 percent of the Earth's atmosphere in 1774.
4. Who invented the stethoscope and when?
In 1816, the French physician Rene Theoplhie Laennec (1781-1826) introduced a perforated wooden cylinder which concentrated the sounds of air flowing in and out of the lungs, and described the sound which it revealed. The modern form of stethoscope, with flexible tubes connecting the earpieces to a circular piece placed against the chest, was developed later in the nineteenth century.
5. What is the brain death?
Brain death means the irreversible brain damage causing the end of independent.
6.Which country is the leading producer of mica?
India is the world's leading producer of sheet mica and accounts for about 60 percent of global mica trade. Important mica bearing pegmatite occurs in Andhra Pradesh, Bihar, Gujarat, Hariyana, Karnataka, Kerala, Maharashtra, Orissa, Rajasthan, Tamil Nadu and West Bengal.
7. Why is Japan called "The Land of the Rising Sun"?
The little of "The Land of the Rising Sun" is a form of Japan's indigenous name of Nippon, which literally means "sun origin". The allusion is to the geographical location of Japan with regard to China. The Japanese flag shows the sun's red on a white background.
8. Which is the largest temple in the world?
According to the Guinness Book of Records 1999, Angkor Wat ("City Temple") in Cambodia is the largest religious structure ever built, covering an area of 402 acres. The entire temple complex has a total area of 15 by 5 miles and consists of 72 major monuments, the construction of which began in AD 900.
9. Why do our teeth decay?
In the case of lower animals, there is a whole succession of teeth throughout their lives. As their teeth are fully developed and used up, they fall out and new ones take their place. Only man has a single replacement of his teeth. By the time a baby is about two years old, it has total of 20 teeth, called milk teeth. Beneath these milk teeth, there is second series of teeth that begin to appear after the ago of six. The milk teeth are replaced by about the age of twelve and then more teeth appear until the adult finally has his no more chance of having new teeth, he has to keep them healthy and free from decay.
It is enamel of the teeth that becomes vulnerable to decay. For instance, when there is an invisible opening in the enamel, the bacteria in our mouth try to sneak into the cavity and they feed on the juicy dentine and the lymph that is in the dentine canals. Soon they erode the walls of the canals, and a cavity is created beneath the enamel. This may go unnoticed for some time, but if the wall of the teeth becomes thin as a result of the work of the bacteria, then we notice it very quickly, just because heat and cold can now penetrate more strongly to the pulp cavity. The pulp occupies a hollow space in the centre of the tooth and contains nerves. These nerves are stimulated by the heat or cold. When a tooth feels sensitive to heat or cold, you can be pretty sure it is a danger signal that decay is talking place.
When the bacteria penetrate through the dentine canals into the pulp cavity, they find a perfect feeding and breeding ground. Now you are in for a toothache as the decay of the tooth has already set in and the network of vessels that supply food to the teeth withers away. The tooth that is no longer nourished becomes a dead shell.
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