A unitless quantity

The unitless quantity is

Which of the following is unitless quantity?

Which of the following is unitless quantity?

Which of the following is unitless quantity?

Which of the following is unitless quantity?

Which of the following is unitless quantity?

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c ) If assertion is true but reason is false. (d) If assertion and reason are false. Q. Assertion: Strain is a unitless quantity. Reason: Strain is equivalent to force.