Question

Color test of water is done with an instrument called

• A. Colorimeter
• B. Turbidimeter
• C. Tintometer
• D. Nephlometer

Hint:

Do not confuse color with turbidity—color is measured by tintometer, turbidity by nephlometer.

Answer 1

The Correct Option is C

Step 1: Understanding color test of water.
The color test of water measures the presence of dissolved colored substances such as organic matter, metals, or industrial waste. It is an important parameter in water quality analysis.
Step 2: Identifying the correct instrument.
A tintometer is specifically designed to measure the color intensity of water by comparing it with standard color solutions.
Step 3: Analyzing the options.
(A) Colorimeter: Used to measure concentration of colored solutions, but not standard for water color testing.
(B) Turbidimeter: Measures turbidity, not color.
(C) Tintometer: Correct, as it is used for color determination of water.
(D) Nephlometer: Measures turbidity using light scattering.
Step 4: Conclusion.
The correct instrument for color testing of water is (C) Tintometer.

Answer 2

This question is about identifying which instrument is used to test the colour of water, so it helps to separate instruments that measure colour from those that measure related but different properties like turbidity or concentration.

1. Colorimeter: A colorimeter measures the concentration of a coloured solution by passing light of a specific wavelength through it, which is useful in chemical analysis but is not the standard instrument named for testing the colour of water as a water-quality parameter.
2. Turbidimeter: This instrument measures turbidity, that is, the cloudiness caused by suspended particles, which is a distinct physical property from colour and does not answer the question of colour intensity.
3. Tintometer: A tintometer works by visually or optically comparing the colour of a water sample against a series of standard coloured glass discs until a match is found, which makes it the dedicated instrument for grading water colour.
4. Nephlometer: This device measures turbidity through the scattering of light by suspended particles, again a different parameter from colour.

Only the tintometer is purpose-built to grade the colour of a water sample against standard references, while the other three instruments target turbidity or general solution concentration.

Therefore, the correct answer is Tintometer.