Question

Which of the following quantities consists of units as m/sec?
A) Speed
B) Distance
C) Weight
D) Time period

Answer 1

Hint
The unit of any quantity can be found using the formula. With the use of the formula we can easily calculate the unit formula regarding the quantity. Let’s taking an example
$F = ma$
Here the unit of the force can be found using the right hand side of the formula. Hence the unit of force is $\dfrac {kg \times m}{s^2}$.
Where, $1 \dfrac {kgm}{s^2} = 1N$. Hence the unit of the force is Newton.

Complete step-by-step answer:
To find the unit using the formula we can easily find out the unit but we have to remember the relative of the quantity.
(i) The quantity distance is denoted by $meter$ of length.
(ii) The quantity time is denoted by $second$.
(iii) The quantity current is denoted by $Ampere$.
(iv) The quantity weight is denoted by $Kilogram$.
Let's consider the options one by one. Taking first option in consideration-
$Speed = \dfrac{{dis\tan ce}}{{time}}$.
Hence here we can say that the unit of the speed is $\dfrac {m}{sec}$. We get the correct answer. $\dfrac {m}{sec}$ is the unit of speed.
Let’s consider other options also. The quantity distance having its unit as $meter$.
Now considering the third option. The quantity weight is denoted by $Kilogram$.
Considering the fourth option. The time period is denoted by the unit of $second$.
Correct option is (A).

Note
A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law that is used as a standard for the measurement of the same kind of the quantity. Any other quantity of that kind can be expressed as a multiple of the unit of the measurement. For example: A length is the physical quantity.