31. Which of the following pairs of physical quantities have the same dimensions?
32. Richter scale is used for measuring
33. A nanometre is equal to
34. Which one of the following is the unit of measure of the thickness of the ozone layer of the atmosphere?
35. Which of the following is not a unit of temperature?
36. What is measured in Cusec?
37. Which unit is used for measuring Astronomical distance?
38. Which one of the following instrument is used for locating submerged objects in an ocean?
39. Unit of momentum is-
40. Which of the following only gives magnitude and not direction?
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