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प्रश्न
Solve the following numerical problem.
The masses of five marbles are 50 g, 55 g, 60 g, 65 g, and 70 g. Find their average mass.
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उत्तर
The sum of masses of all marbles
= 50 g + 55 g + 60 g + 65 g + 70 g = 300 g
Number of marbles = 5
Average mass of a marble = sum of mass / no. of marbles
= 300 / 5 g
= 60 g
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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):
Match the following column:
| Column A | Column B |
| (a) Length of a housing plot | (1) Clock |
| (b) Breadth of a book | (2) Beam balance |
| (c) Mass of an apple | (3) Thermometer |
| (d) Period of time for study | (4) Measuring tape |
| (e) Temperature of a body | (5) Graph paper |
| (f) Surface area of a leaf | (6) Metre ruler |
Define mass.
Define one kilogram, the S.I. unit of mass.
Name the device commonly used to measure mass.
Name the device commonly used to measure weight of a body.
We can say that mass of an object is 126 kg.
Find the odd one out.
State whether true or false. If false, correct the statement.
A physical balance is more sensitive than a beam balance.
Kerosene is measured with the help of the graduated cylinder.
