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?

What is called the minimum distance from the Sun in a planet in its orbit?

The oceanic crust mainly consists of silica and __________.

In the following questions, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.

Language, they say, is the _____ through which human beings perceive the world. If so, English is perhaps the most _____ lens through which to see animals. It has _____ a cross eyed view of birds, beasts, fish and fowl. The very word “animal” can _____ the brutish and the sensual. Animal _____ imply baseness and vulgarity.
Language, they say, is the _____ through which human beings perceive the world.

Which of the following micro-organism causes diseases like polio and chicken pox?

The__________ are the primary female sex organs that produce the female gamete (ovum) and several steroid hormones (ovarian hormones).

Which of the following river originates in Nepal and flows into the Ganges?

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

to treat with cruelty or violence