Q31. | Fathometer is used to measure |
Q32. | Richter scale is used for measuring |
Q33. | The apparatus used in submarines to give a clear view of the object, on the surface of the ocean or ground is known as |
Q34. | The instrument used to measure electric current is |
Q35. | Six's Thermometer is used to measure ? |
Q36. | Density of milk is measured by |