Question

Assertion: In the measurement of physical quantities direct and indirect methods are used.
Reason: The accuracy and precision of measuring instruments along with errors in measurements should be taken into account, while expressing the result.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct

Answer 1

Hint:- In order to answer the question, firstly we will discuss the types of methods which are useful in the measurement of physical quantities. Then we will check whether in the given reasons, both the methods discussed properly or not.

Complete step by step solution:-
Direct measurement refers to directly measuring the quantity for which the experiment is performed while indirect measurement means first measuring some primary quantities and then using them to calculate the required quantity. It has no connection to accuracy and precision. Exactness should be considered to know the closeness of result to genuine worth while accuracy is needed to get the relationship between various qualities which are seen in consistently playing out a trial.
The given reason is about the measurement of physical quantities but it doesn’t explain about the methods used in the measurement of physical quantities such that direct and indirect methods.
Both direct and indirect methods of level measurement are applicable to a range of industrial level analysis applications. By using a detachment valve in every one of these strategies, organizations can give simplicity of field adjustment, improve wellbeing conditions, and get more precise estimations of their stock.
So, both statements are correct but the reason one doesn’t explain first.

Hence, the correct option is (B.) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Note:- It is the most common method of measuring the physical quantities like length, temperature, pressure, etc. Example: The physical balance directly measures the weight of the matter. Indirect Method of Measurement – The direct measurement gives the inaccurate results in most of the cases.