X sits at one of the extreme ends and sits three places away from the one who faces S.P faces the one who sits to the immediate left of S. Only one person sits between P and T, who faces Q. Now, as X either sits extreme right or left end of row 1 or sits extreme right or left end of row 2 so, we have four possible places for X. 
U sits second to the left of Q and is sitting adjacent to the one who faces R. T is not sitting adjacent to R. case I and III are invalid as R and T are not sitting together. 
Neither O nor V sits at the extreme ends. V neither faces west nor sits adjacent to U. case IV is rejected as we can’t fix V in case IV. The final arrangement is as follows: 
Match the following machines with their working principles:
(i) Electric motor - (a) Heat energy into mechanical energy
(ii) Steam engin...
In order to investigate the internal atomic structure of crystals, we make use of:
The surface tension of water on adding detergent to it –
In a concave mirror which of the following pair of position of object – size of the image is correct?
I. At infinity – point sized
What is the work done by a centripetal force on an object moving in a circular path at constant speed?
In an electric motor, energy is transformed from:
A body is thrown upward with an initial velocity of 20m/s. How much time will it take to reach its maximum height. (g=10m/s)
Which of the following does not affect the value of acceleration due to gravity?
In the absence of ozone layer, which rays will enter into atmosphere?
Which instrument is used to measure the moisture content in the air?
