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प्रश्न
Match the following.
| 1. | Length | kelvin |
| 2. | Mass | metre |
| 3. | Time | kilogram |
| 4. | Temperature | second |
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उत्तर
| 1. | Length | metre |
| 2. | Mass | kilogram |
| 3. | Time | second |
| 4. | Temperature | kelvin |
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संबंधित प्रश्न
Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):
the number of strands of hair on your head
Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):-
the number of air molecules in your classroom.
Length of one’s chest can be measured using metre scale.
Fill in the following chart.
| Property | Definition | Basic Unit | Instrument used for measuring |
| Length | |||
| Mass | |||
| Volume | |||
| Time |
Rulers, measuring tapes and metre scales are used to measure ______
Which line is longer? C or D? Measure each line. How good is your guess?
Difference in size 
Do this for yourself and find the difference.
Can you think of how to cut a postcard so that you can pass through it?
What formula is used to measure the area of your classroom?
Larger unit for measuring time is ______.
