Question
Which of the following is the unit of length?
This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is
Light year
Understanding Units of Length: Light Year
The question asks to identify the correct unit of length from the given options. Let's analyze each option:
- Option 1: Light year - This is a unit of astronomical distance. It represents the distance that light travels in a vacuum in one Julian year. Therefore, it is a unit of length.
- Option 2: Candela - This is the SI base unit for luminous intensity. It measures the brightness of a light source, not length.
- Option 3: Lunar month - This is a unit of time, approximately the duration of one cycle of Moon phases (about 29.5 days). It does not measure length.
- Option 4: Kelvin - This is the SI base unit for thermodynamic temperature. It measures how hot or cold something is, not length.
- Option 5 is empty.
Conclusion on Length Unit
Based on the analysis, the light year is the only unit among the options that measures length.
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