Questions

Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25 cm from the optical centre?

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.

By courtesy of

Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.

To avoid the various foolish opinions to which mankind are prone, no superhuman brain is required. A few simple rules will keep you free, not from all errors, but from silly errors. If the matter is one that can be settled by observation, make the observation yourself. Aristotle could have avoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth open while he counted. Thinking that you know when in fact you do not is a bad mistake, to which we are all prone. I believe myself that hedgehogs eat black beetles, because I have been told that they do; but if I were writing a book on the habits of hedgehogs, I should not commit myself until I had seen one enjoying this diet. Aristotle, however, was less cautious. Ancient and medieval writers knew all about unicorns and salamanders; not one of them thought it necessary to avoid dogmatic statements about them because he had never seen one of them.

According to the author, unicorns and salamanders

In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.

to allay the sorrow or grief

The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options.

P: Forests make for beautiful natural landscapes and scenery.
Q: They offer visitors and tourists the beauty of trees and plants of all kinds and a large variety of wildlife that inhabits the area.
R: Forests are a treasure house of nature.
S: People enjoy going into the forests either on foot or on a safari.

In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.

Extreme or indefinite to be adequately described.

In the following question, a passage is given which describes a situation. From the given options, mark the correct inference that can be drawn from the passage. If none of the inferences follow, mark option 5, “None of these” as the answer.
In nearly all human populations a majority of individuals can taste the artificially synthesized chemical phenylthiocarbonide (PTC). However, the percentage varies dramatically-- from as low as 60% in India to as high as 95% in Africa. That this polymorphism is observed in non- human primates as well indicates a long evolutionary history which, although obviously not acting on PTC, might reflect evolutionary selection for taste discrimination of other, more significant bitter substances, such as certain toxic plants.

Myanmar shares around ___________ border with India.