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SSC CHSL 2019 PYQ — Question 42

SSC CHSL - 11th July 2019 - Shift 1 • General Awareness • Q42

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In May 2019, the kilogram was redefined for the first time in 130 years. It will now be redefined by a fundamental property of nature known as:

Show answer & explanation

Correct answer: D

Explanation

The correct answer is option 4, i.e. Planck's Constant.

In May 2019, the kilogram was redefined for the first time in 130 years. It will now be redefined by a fundamental property of nature known as:

Planck's Constant

Planck's Constant:
  • The kilogram has been defined since 1889 by a shiny piece of platinum-iridium held in Paris. All modern mass measurements are traceable back to it - from micrograms of pharmaceutical medicines to kilos of apples and pears and tonnes of steel or cement.
  • The new definition of kg involves accurate weighing machines called 'Kibble balance', which uses Planck's Constant to measure the mass of an object using a precisely measured electromagnetic force.