Physics Units, Dimensions and Measurement JEE Main 2023 - ( Units and Dimensions ) MCQ (Single Correct)

Given below are two statements :

Statement I: Astronomical unit (Au), Parsec (Pc) and Light year (ly) are units for measuring astronomical distances.

Statement II: Au < Parsec (Pc) < ly

In the light of the above statements, choose the most appropriate answer from the options given below:

A
Both Statements I and Statements II are incorrect
B
Statements I is correct but Statements II is incorrect
C
Both Statements I and Statements II are correct
D
Statements I is incorrect but Statements II is correct

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Text Solution

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The correct answer is:
B

Astronomical unit denotes roughly the distance from Earth to the Sun. Parsec is a unit of length used to measure the large distances to astronomical objects outside the Solar System. A light-year is another large unit of length used to express astronomical distances.

The relation between these units are as follows:

1 Parsec = 2 x 10 5 Au

lAu = 1.58 x10 -5 ly

Thus, lAu < ly < Parsec.

Hence, Statements I is true but Statements II is false.

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