System of units and clocks. Science State Board, Class 8: lessons, tests, tasks.

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1.	Base units Difficulty: easy	2
2.	Rounding off Difficulty: easy	2
3.	Radian to degree Difficulty: medium	3
4.	Round off the decimal values Difficulty: easy	2
5.	Measuring units Difficulty: medium	4
6.	Metric system Difficulty: easy	2
7.	Object's temperature Difficulty: easy	2
8.	Heat Difficulty: medium	4
9.	Measurement quality Difficulty: hard	6
10.	Current in a circuit Difficulty: medium	4
11.	Degree to radian conversion Difficulty: medium	4
12.	Base quantities Difficulty: easy	2
13.	Terms of measurement Difficulty: easy	2
14.	Fundamental physical units Difficulty: easy	3
15.	Physical quantities Difficulty: hard	6
16.	Values of measurement Difficulty: medium	4
17.	Applications of measurement Difficulty: easy	4
18.	Types of clocks Difficulty: medium	4
19.	Time zones Difficulty: medium	4
20.	Solid angle Difficulty: hard	6
21.	Display clocks Difficulty: easy	2
22.	Heartbeat Difficulty: medium	4
23.	Atomic clocks Difficulty: medium	4
24.	Measuring devices Difficulty: easy	2
25.	Units systems Difficulty: easy	3

1.	Training test 1 Difficulty: easy	7
2.	Training test 2 Difficulty: easy	8
3.	Training test 3 Difficulty: medium	7
4.	Training test 4 Difficulty: easy	9

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System of units and clocks