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Why length, mass and time are chosen as base quantities in mechanics?

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Important Questions on Measurements & Experimentation

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9th ICSE
IMPORTANT
All In One ICSE Physics>Chapter 1 - Measurements & Experimentation>CHALLENGERS>Q 5
A bus travels 110 km/h on an open highway. What is this speed in standard SI unit?
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9th ICSE
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All In One ICSE Physics>Chapter 1 - Measurements & Experimentation>CHALLENGERS>Q 6
The mass of the Earth is 5.98×1024  kg. If the average mass of the atoms of the Earth is 40 u, then the number of atoms in the Earth is
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9th ICSE
IMPORTANT
All In One ICSE Physics>Chapter 1 - Measurements & Experimentation>CHALLENGERS>Q 7
A vernier callipers has 1 mm mark on the main scale. It has 20 equal divisions on the vernier scale which match with 16 main scale divisions. For this vernier callipers, the least count is
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9th ICSE
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All In One ICSE Physics>Chapter 1 - Measurements & Experimentation>CHALLENGERS>Q 8

A circular scale of a screw gauge has 50 divisions and pitch 0.5 mm. Find the diameter of the sphere (main scale reading is 2)

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9th ICSE
IMPORTANT
All In One ICSE Physics>Chapter 1 - Measurements & Experimentation>CHALLENGERS>Q 9
Which of the following phenomena can be used as a measure of time?
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9th ICSE
IMPORTANT
All In One ICSE Physics>Chapter 1 - Measurements & Experimentation>CHALLENGERS>Q 10
The length of a pendulum is decreased by 10⁒. What will be the change in its frequency?