Questions

Fischer projections were originally proposed for the depiction of carbohydrates and used by chemists, particularly in organic chemistry and biochemistry.A Fischer projection always uses an eclipsed conformation. A Newman diagram can represent either an eclipsed conformation or a staggered conformation or a skew conformation.

Given total number of rats = 999919

999919 = 1000000 - 81 = 10002 - 92 = (1000+9)(1000-9) = 1009 x 991.
Since there were more rats than there were cats, 991 cats killed 1009 rats each.

Hygrometer is used for measuring humidity of air.

Generic means related to a group of similar things rather than a particular one. It means it is not a specific thing like branded or trademarked. Hence it is a basic one.

Among the given options, Generic is most similar in meaning to Basic.

India is the second largest producer of Rice in the World. Rice is the most cultivated crop in India.

According to 2002-2003 census, about 33 million hectares of area in India was cultivated with Rice.

‘Lest’ is always followed by ‘Should’, as it is used to express a purpose. Thus, the correct formation would be, ‘He decided to take the help of a guide lest he should miss the way’.