Here are some important things related to sound.
→ Supersonic planes fly with the speed greater than the speed of sound.
→ The unit used to measure the supersonic speed is mach.
SONAR:
→ Full form of SONAR is Sound Navigation and Ranging.
→ The SONAR method is also known as echo ranging.
→ SONAR works on the principle of reflection of sound waves, also known as the echo principle.
→ SONAR uses ultrasonic waves.
→ SONAR technique is used to determine the depth of the sea, locate the underwater hills, valleys, submarines, icebergs etc.
→ Distance, direction and speed of under water objects can be measured with the help of SONAR.
Attempt the previous year questions from different exams like RRB, SSC, etc.
By this you will know, how the questions are asking in real exams.
If you think option C is right then click on option C. If it is right then green will appear or if it is wrong then red will appear.
Set a stopwatch and try to answer the questions for each page of MCQs.
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