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Answer:
SI unit of mass is gram
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29: A) Number 3 and 4 the terminals of the bulb.
B) An inscandesent bulb works on the principal of incandesce, a general term meaning light produced by heat. In an incandescent type of bulb, an electric current is passed through a thin metal filament, heating the filament until it glows and produces light.
30: A) Standard untis are commonly used units of measurment, which help us measure length, height, weight, temperature, mass and more. These units are standardised, which means that everyone gets the same understanding of tye size, weight and other properties of objects and things.
B) The kilogram symbol kg, is the SI unit of mass. It defined by taking the fixed numerical value of the planck constant h to be 6.626 070 15× 10-34 when expressed in the unit J s, which is equal to kg m2 s-1, where the meter and the second are defined in the terms of c and ^↓Cs.
C) Care should be taken to keep the ruler along the length of the object. If the edge of tye ruler is worn out or broken, the measurement should be started from any other mark that is full clear. Eyes should be exactly above tue point where the measurement is to be taken.
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