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प्रश्न
State two characteristics of a unit.
उत्तर
Two characteristics of a unit are:
- It should be of convenient size.
- It must be universally accepted, i. e. its value must remain the same at all places and at all times.
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संबंधित प्रश्न
A block of iron has dimensions 2 m × 0.5 m × 0.25 m. The density of iron is 7.8 g cm−3. Find the mass of block.
Convert the following quantity as indicated:
20 cm = m
Express in second :
3 minute 15 second
Answer the following in short.
What are the characteristics of a standard unit?
Answer the following in short.
What is parallax error?
Give reason for the following.
Body parts should not be used for correct measurements of an object.
Your friend was absent from school yesterday. You are enquiring about his absence. He told that he had a fever and it was measured to be 100oC. Is it possible to have a 100oC fever? If he is wrong, try to make him understand.
What do you mean by ‘unit’?
Match the following:
| Column I | Column II | |
| 1. | FPS | Metre, kilogram, and second |
| 2. | CGS | Foot, pound, and second |
| 3. | MKS or SI | centimeter, gram, and second |
The density of a material in SI unit is 128 kg m-3. In certain units in which the unit of length is 25 cm and the unit of mass is 50 g, the numerical value of density of the material is _____.
