1. What is
synthetic rubber?
Ans. 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?
Ans. 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?
Ans. Joseph Priestly
discovered oxygen, the colorless, odorless, gaseous chemical element forming
about 20 percent of the Earth’s atmosphere in 1774.
4. Who invented
the stethoscope and when?
Ans. 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?
Ans. Brain death
means the irreversible brain damage causing the end of independent.
6.Which country is
the leading producer of mica?
Ans. 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”?
Ans. 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?
Ans. 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?
Ans. 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.
10. What is
Ikebana?
Ans. Ikebana pertains
to Japanese floral art or flower arrangement. It is a highly elaborate and
unique form with highly developed conventions and complex symbolism. People say
that Ikebana is associated with the ritual of offering flowers to the Buddha.
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