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To observe an included angle with better accuracy the method preferred will be

AReiteration

BRepetition

CDouble observation

DVernier observation

Answer:

B. Repetition


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Directions: In the question below is a statement followed by two conclusions numbered I and II. You have to assume everything in the statement to be true, then consider the two conclusions together and decide which of them logically follows beyond a reasonable doubt from the information given in the statement.

Statement:  Only science students are permitted to attend the conference, other than science students no one is permitted.

Conclusions: 

I. All students present at the conference are science students.

II. Those students who do not have a science background are not allowed in the conference.