d (d) The electron volt (symbol ev; also written electronvolt) is a unit of energy equal to approximately $\left.1.602 \times 10^{-19} \text { joule (SI unit } \mathrm{J}\right)$
By definition, it is the amount of energy gained by the charge of a single electron moved across an electric potential difference of one volt.
Hence, the correct option is $d$
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Diameter of a steel ball is measured using a Vernier callipers which has divisions of $0. 1\ cm$ on its main scale $(MS)$ and $10$ divisions of its vernier scale $(VS)$ match $9$ divisions on the main scale. Three such measurements for a ball are given as
S.No.
$MS\ (cm)$
$VS$ divisions
$(1)$
$0.5$
$8$
$(2)$
$0.5$
$4$
$(3)$
$0.5$
$6$
If the zero error is $- 0.03\ cm,$ then mean corrected diameter is $........... cm$
The main scale of a vernier calliper has $n$ divisions/ $\mathrm{cm}$. $n$ divisions of the vernler scale coincide with $(\mathrm{n}-1)$ divisions of maln scale. The least count of the vernler calliper is,
A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings $5.50\, mm , 5.55\, mm ,$$ 5.45\, mm ; 5.65\, mm .$ The average of these four readings is $5.5375\, mm$ and the standard deviation of the data is $0.07395\, mm .$ The average diameter of the pencil should therefore be recorded as