JEE PHYSICS MCQ: UNITS & MEASUREMENTS

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Understanding +4 | -1

Statement-I: The length of an object is measured with two instruments as

l=4.01 \mathrm{~cm}

and

l=4.009 \mathrm{~cm}

. The second instrument has a better resolution.
Statement-II: More value is the least count of an instrument, better is the resolution.

View answer and explanation

Correct option: B

Statement-I is true and statement-II is false

Option B is correct because the instrument with more decimal places (4.009 cm) has better resolution, and a smaller least count implies better resolution, not more.

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The method of dimensional analysis can be used to derive which of the following relations? Statement-I: Dimensions of constant of proportionality of constants can be derived from dimensional method
Statement-II: Numerical value of constant of proportionality can be found from experiments only The dimensions of torque are The physical quantity having the dimensions

\left[ {{\mathrm{M}^{ - 1}}{\mathrm{L}^{ - 3}}{\mathrm{A}^2}{T^3}} \right]

is A quantity X is given by

{\varepsilon _0}L\frac{{\Delta V}}{{\Delta t}},\;

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{\Delta V}

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{\Delta t}

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