Placement Question 1
1) What could be a possible arrangement of 10 points in space so that five lines could be drawn with a condition that every line has four points on it.
This is a question which you would had come across in several puzzle books and previous questions. Answer is a "star". You could try drawing a star and count the number of intersections which should be 10.
Placement Question 2
2) Ram has 30 Rupees with him. He has two Rupee notes. One of the rupee notes is not a 20 Rupee note. Then find out the notes he has with him ?
These kinds of questions are the simplest of the simpler ones. But one could tend to miss out due to nervousness.Here is the answer : One of the rupee notes is not a 20 Rupee note. So the other one can be a 20 Rupee :). And the first one should be a 10 Rupee note.
Placement Question 3
3) In a dark room with no equipments other than a clock, you are given a pendulum. How can you measure your height now ?
This is a bit difficult one. Time period of pendulum is given by 2 X 3.14 X (sqrt(height of rope/gravity)). Now, gravity = g = 9.18.
Using stop clock you can find the Time Period of pendulum.(average time for one oscillation). Using the formula for time period you can measure the height of the rope. Then using the rope you can measure your own height.