1.Name three main system of units in vogue to measure length,weight and time.
2.Which systems are known as metric systems?
3.Which system is accepted as the international system of units?
4.Name the unit in which the temperature of a body is measured.
5.Why can a pace or a footstep not be used as a standard unit of length?
Answers
Answer:
length breadth and height
Answer:
1- length, breadth And height. Answer 1
2-At first the metric system was based on two quantities: length and weight. The basic units were called the metre and the gramme. In 1866 the United States started to use the metric system, but it still is not the main US system of measurement. Answer 2
3-The International System of Units is a system of measurement based on 7 base units: the metre (length), kilogram (mass), second (time), ampere (electric current), Kelvin (temperature), mole (quantity), and candela (brightness). These base units can be used in combination with each other. Answer 3
4-Temperature characterizes the body as hot or cold. The SI unit used to measure the temperature in Kelvin(K). The other scales used to measure the temperature are Celsius or Fahrenheit. Answer 4
5-The size of the foot varies from person to person. If footsteps of two persons are used to measure the length respectively, then the two distances may not be equal. Thus, a footstep is not a constant quantity. Hence, it cannot be used as a standard unit of length.
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