Upendra Prasad Singh has been appointed as the secretary of which ministry?

Read the following graph carefully and answer the related questions-

Total number of students (in thousands) participating in comitative exam in various cities.

What is the ratio of number of students appearing for competitive exam from city C and D together to those appearing from A, D and E together?

The period from 7-12 years of age is known. according to Piaget's theory of cognitive development, as

Which of these animals have external and internal skeleton?

In which tournament has Novak Djokovic, the world's number one tennis player, won for the third time in a row and a record ninth time?

In the following passage some of the words have been left out. Read the passage carefully and choose the correct answer to each question out of the four alternatives and fill in the blank.

The Solar System has been a complicated wonder for the astronomers. This is a__(21)__to which we may never have the exact answer. Man has wondered__(22)__the age of the Earth__(23)__ ancient times. There were all kinds of__(24)____that seemed to have the___(25)___But man could not begin to think about the question scientifically until about 400 years ago when it was proved that the Earth revolved round the Sun and the Earth was a part of our Solar System, then scientists knew where to begin. 

Fill at the option (25).

When was India's first multi-purpose river valley project launched?

Under which scheme, free Liquefied petroleum gas Refills will be provided to Ujjwala beneficiaries over the period of 3 months, that is, from April-June 2020?