Assistant Director Wildlife BS 17 PPSC PAST PAPER 2025, General Knowledge MCQs, PPSC Past Papers PDF | By

Which instrument is used to measure the wavelength of radiation absorbed by a substance?

A. Thermometer
B. Spectrophotometer
C. Barometer
D. Hygrometer
Correct Answer: B. Spectrophotometer
Explanation: Used in labs to measure absorption of light at specific wavelengths.

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