31. What is measured in hertz?
32. A vector quantity has both magnitude and direction, whereas a scalar quantity has only magnitude and no direction. Which of the following is a vector quantity?
33. The SI unit of electrical resistance of conductor is
34. The apparatus used for detecting lie is known as
35. Which instrument is used for measuring density of milk?
36. One micron represents a length of
37. The international unit of Speed is-
38. How can the height of a person who is six feet tall, be expressed (approximately) in nanometre?
39. The physical unit is
40. Which among the following devices is used to measure the atmospheric pressure?
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