Which of the following is a pair of scalar quantities?
question 15 options:
velocity - distance
velocity - displacement
time - speed
time - displacement

Time and speed is a pair of scalar quantities.

Explanation:

Scalar quantities are known to have only magnitude and don’t have a direction. Some examples of scalar quantities are mass, length, temperature etc. In contrast a vector quantity is known to have a definite magnitude as well as a well defined direction.

Force, displacement, velocity etc are some common vector quantities. The value of a vector quantity can be taken positive or negative depending on the direction of the vector. Vectors are represented by vector diagrams.

We have that for the Question it can be said that a pair of scalar quantities is the Options is

time- speed

Option C

From the question we are told

Which of the following is a pair of scalar quantities?

Question 15 options:  

Generally

Scalar quantity are quantities that identify with magnitude solely

Vector quantity are quantities that identify with magnitude and direction

Therefore

a pair of scalar quantities is the Options is

time- speed

Option C

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.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

neither accurate nor precise.