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Adding, multiplying or averaging with significant figures

This type of question, asked 4 times: 5 Apr 2024, 24 Jan 2025, 3 Apr 2025, 21 Jan 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    5 Apr 2024

    17
    Time periods of oscillation of the same simple pendulum measured using four different measuring clocks were recorded as 4.62 s,4.632 s,4.6 s4.62\text{ }s,4.632\text{ }s,4.6\text{ }s and 4.64 s4.64\text{ }s. The arithmetic mean of these reading in correct significant figure is.

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  2. Question 2

    24 Jan 2025

    4
    For an experimental expression y=32.3×112527.4y =\frac{32.3 \times 1125}{27.4}, where all the digits are significant. Then to report the value of yy we should write :-

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  3. Question 3

    3 Apr 2025

    17
    A person measures mass of 3 different particles as 435.42 g,226.3 g435.42\text{ }g,226.3\text{ }g and 0.125 g . According to the rules for arithmetic operations with significant figures, the additions of the masses of 3 particles will be.

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  4. Question 4

    21 Jan 2026 S2

    11
    Keeping the significant figures in view, the sum of the physical quantities 52.01 m,153.2 m52.01\text{ }m,153.2\text{ }m and 0.123 m is :

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