46. two students X and Y report tha masses of the same substance as 7.0g and 7.00g respectively.which of the following is correct? a.both are equally correct . b.X is more accurate. c.Y is more accurate. d.both are inaccurate scientifically

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Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. Correct reading of mass is 3.0 g. On the basis of given data, mark the correct option out of the following statements

$\begin{matrix} S t u d e n t s & R e a d i n g (i) & (i i) A & 3.01 & 2.99 B & 3.05 & 2.95 \end{matrix}$

(a) Results of both the students are neither accurate, nor precise

(b) Results of students A are both precise and accurate

(d) Results of student B are both precise and accurate

Q. Weighing machine

^{'} A^{'}

is showing 15.324 kg, and weighing machine

^{'} B^{'}

is showing 15.1 kg for an object whose actual mass is 15 kg then,

Q. A student measure the thickness of an object by three different instruments and gets the result as 0.5 cm, 0.50 cm, 0.500 cm. State the one which is more accurate.

Four screw gauges are to be calibrated to the standard thickness $t_{s t}$ of a wire. Series of measurements were performed by each instrument to obtain a distribution of the measured values as shown.

Which of the following statements is correct?

If precisely measured data are available the simple correlation coefficient is

(a) more accurate than rank correlation coefficient

(b) less accurate than rank correlation coefficient

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