Given below in the the left column are different modes of communication using the kinds of waves given the right column.
A Optical Fibre communication P Ultrasound B Radar Q Infrared Light C Sonar R Microwaves D Mobile Phones S Radio Waves
| A | Optical Fibre communication | P | Ultrasound |
| B | Radar | Q | Infrared Light |
| C | Sonar | R | Microwaves |
| D | Mobile Phones | S | Radio Waves |
Show Hint
- A-Q, B-S, C-R, D-P
- A-Q, B-S, C-P, D-R
- A-S, B-Q, C-R, D-P
- A-R, B-P, C-S, D-Q
The Correct Option is B
Solution and Explanation
Sonar uses ultrasonic waves: C-P.
Only option (2) has both A-Q and C-P (options 1, 3 and 4 pair sonar or optical fibre with wrong waves).
The remaining pairs in option (2) are radar - radio waves (B-S) and mobile phones - microwaves (D-R); radar signals are radio-frequency waves (the microwave band is part of the radio spectrum) and mobile phones work at about 0.8-2 GHz, in the microwave band.
Answer: (2) A-Q, B-S, C-P, D-R
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