Mechanical pulse having an oscillation frequency in range of `_____________

Which of the following statements is/are true for the ultrasonic test?

At least 30 ______ of crosshead travel or more for high elongation materials.

Rule (ruler/scale), capable of reading the dimensions of test specimens to an accuracy of ____

Ring tensile strength is ______

In charpy test specimen, the angle of v-notch section is ________

The slump would not exceed 50 mm when compacting concrete with vibrators.

A data acquisition system capable of digitally recording and storing load and deflection data at least _______