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Q: Which type of scale is used to measure an angle or to set off an angle and are marked on a rectangular protractor graduated from 0⁰–90⁰?
  • A. Chord scale
  • B. Diagonal scale
  • C. Plain scale
  • D. Vernier scale
Correct Answer: Option A - • Chord Scale is used to make angles and to measure angles of any magnitude with high degree accuracy. It is generally marked on a rectangular protractor. • Diagonal Scale is used to measure three consecutive units i.e. a unit and its immediate sub divisions. • Plain Scale is used to measure up to two consecutive units. i.e– a unit and its immediate Sub divisions for exp:– Metre & decimeter. • The Vernier Scale is used for determining the fractional parts or the smallest division of the main scale more accurately than it can be done by simply estimating by eye.
A. • Chord Scale is used to make angles and to measure angles of any magnitude with high degree accuracy. It is generally marked on a rectangular protractor. • Diagonal Scale is used to measure three consecutive units i.e. a unit and its immediate sub divisions. • Plain Scale is used to measure up to two consecutive units. i.e– a unit and its immediate Sub divisions for exp:– Metre & decimeter. • The Vernier Scale is used for determining the fractional parts or the smallest division of the main scale more accurately than it can be done by simply estimating by eye.

Explanations:

• Chord Scale is used to make angles and to measure angles of any magnitude with high degree accuracy. It is generally marked on a rectangular protractor. • Diagonal Scale is used to measure three consecutive units i.e. a unit and its immediate sub divisions. • Plain Scale is used to measure up to two consecutive units. i.e– a unit and its immediate Sub divisions for exp:– Metre & decimeter. • The Vernier Scale is used for determining the fractional parts or the smallest division of the main scale more accurately than it can be done by simply estimating by eye.