Questions

A broadcasting station transmits waves with a frequency of 71 x 104 Hz and a speed of 3 x 108 m/s. The wavelength of the wave is

One of the following is also called as World Bank

Black revolution relates to which of the following?

Which of the following transports water from the roots of the plant to its leaves?

According to the law of diminishing marginal utility, as the amount of a good consumed increases, the marginal utility of that good tends to 

Lavani is a traditional dance of which Indian state?

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/Phrase.
To put a spoke in one's wheel

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.

Books are our ______ friends. They are our guides. We can learn everything from them. The books contain all the great ______ of the world's leaders and we can learn them by reading the books. The books help us find ______ to our questions. The books never fail us. We should read as ______ books as we can. But all books are not good. So we should ______ only good books. Books are our ______ friends.