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Question

Few quantities with their units are listed below. Mark the units which are not correctly matched.
(i) Density : kg m−3
(ii) Velocity of light : m s−1
(iii) Planck's constant : J−1s−1
(iv) Acceleration : m s−2
(v) Force : kg m

A
(ii) and (iv)
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B
(i) and (iii)
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C
(iii) and (v)
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D
(iv) and (v)
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Solution

The correct option is A (iii) and (v)
(i) Density : mass per unit volume, unit: kgm3
(ii) Velocity of light: distance per unit time, unit: ms1
(iii) Planck's constant: Energy × time, unit:Js
(iv)Acceleration: rate of change of velocity, unit ms2
(v)Force: mass × acceleration, unit: kgms2
Thus (iii) and (v) donot match
option C is correct

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