The water bearing layer of the earth called P is made up of two components Q and R in which water collects under the ground.The top level of layer P is called S.When too many tube-wells are used in an area,the level of S in that area goes down.What are P,Q,R and S?

The accompanying diagram shows the uterine tubes of four women (P,Q,R and S) In which two women is fertilisation impossible at present ?

Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. what are metals P,Q,R and S? How have you arrived at this conclusion?

The fossil fuel P is formed under the earth by the decomposition of vegetable matter lying under water by the action of anaerobic bacteria. The major component of fuel P is Q. The fossil fuel P is used as a source of gas R needed to manufacture nitrogen fertilisers . When P is filled in metal cylinder and used as a fuel in motor vehicles, it is called S. What are P, Q , R and S ?

A solid mixture contains four constituents P, Q, and S. P consists of tiny grains and it is mixed with cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the process of evaporation. R is in the from of tiny particles of a material whose corrosion is called resting. And S is a white solid which is used in making ordinary dry cells. (a) What could P, Q R and S be ? (b) How would you separate a mixture containing P, Q, R and S ?

A vertical tube is made to stand in water so that the water level can be adjusted. Sound wave of frequency 320Hz are sent into the top of the tube. If standing waves are produced at two successive water levels of 20 cm and 73 cm , what is the speed of sound waves in the air in the tube (in m//s )

In the following items, each passage consists of six sentences. The first and the sixth sentence are given in the beginning as S_(1) and S_(6) . The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. S_(1) : Get hold of the catalogues of the colleges in the United States. S_(6) : They all aim at the first rate. P : I think there is a common feature and that every course given has a similar aim. Q : Is there any common feature in these coures ? R : You will find courses in innumerable subjects. S : Is there any aim which all of them have ? The proper sequence should be : (a) R-Q-S-P (b) P-Q-R-S (c) R-Q-P-S (d) P-R-S-Q