In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

People may see, and hear, and feel all their lives without ____________ learning the nature of things they see. But reason is the mind's eye, and enables us to see why things are, and when and how events may be made to happen ___________ not to happen. The logician endeavours to ____________ exactly what this reason is which makes the power of men. We all, as I have said, must reason well or ill, but logic is the science of reasoning and enables us to distinguish ______________ the good reasoning which leads to truth, and the bad reasoning which every day betrays people into error _________ misfortune.

their lives without ____________ learning the nature 

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.

The two children were(A)/identical except for(B)/the colour for their eyes.(C)/No error(D)

In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one, which best expresses the same sentence in Passive/Active voice.

The partners will celebrate their triumph tomorrow.

______ character of a bond between two atoms is greater if the difference in their electro negativities is lesser.

The ratio of present ages of Ratna and Shantanu is 5:4. After 19 years the ratio of their ages will be 10:9. What is Ratna's present age?

Match the characteristics with their market structure:

(a) Differentiated products, but close substitutes for consumers so their demand curves are elastic.
(b) Firm will tend to set output so that it earns maximum profits.

Find two numbers such that their mean proportion is 12 and third proportion is 768.

Match the characteristics with their market structure:

(a) MR = MP
(b) Elasticity of demand depends on pricing policies of rivals