New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    Why is red colour preferred for danger signal

    lights?
    A Because red colour light has shorter wavelength Correct Answer Incorrect Answer
    B Because red colour is preferred by many Correct Answer Incorrect Answer
    C Because red colour light has longest wavelength and least scattered by fog and smoke Correct Answer Incorrect Answer
    D Because red colour is bright to eyes Correct Answer Incorrect Answer

    Solution

    Red color is preferred for danger signal lights because red color light has the longest wavelength and is least scattered by fog and smoke. This makes red light more visible over longer distances and in adverse weather conditions, ensuring that warning signals are clear and noticeable.

    Practice Next

    Relevant for Exams: