There are six sentences markedS1, P, Q, R, S. The positions of S1 and S6 are fixed: You are required to choose one of the four alternatives given below every passage which would be the most logical sequence of the sentences in the passage.
S1: The coming of the computer sparked the seed for the remotely operated controls.
P: It is a silicon chip that is at the heart of the remote control.
Q: This produces an infrared beam, which is made up of electromagnetic waves.
R: When you press the button on the remote control, the chip sets off an electronic vibration.
S: The beam carries a coded signal switch on, raise volume etc.
S6: The code is based on binary digits.
a. PQRS
b. PRQS
c. PQSR
d. RPQS