JEE Main 2022 (Online) 26th July Morning Shift | Units & Measurements Question 65 | Physics

A screw gauge of pitch $$0.5 \mathrm{~mm}$$ is used to measure the diameter of uniform wire of length $$6.8 \mathrm{~cm}$$, the main scale reading is $$1.5 \mathrm{~mm}$$ and circular scale reading is 7 . The calculated curved surface area of wire to appropriate significant figures is :

[Screw gauge has 50 divisions on its circular scale]

6.8 cm²

3.4 cm²

3.9 cm²

2.4 cm²

JEE Main 2022 (Online) 25th July Evening Shift

MCQ (Single Correct Answer)

-1

The maximum error in the measurement of resistance, current and time for which current flows in an electrical circuit are $$1 \%, 2 \%$$ and $$3 \%$$ respectively. The maximum percentage error in the detection of the dissipated heat will be :

JEE Main 2022 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

-1

If momentum [P], area $$[\mathrm{A}]$$ and time $$[\mathrm{T}]$$ are taken as fundamental quantities, then the dimensional formula for coefficient of viscosity is :

$$\left[\mathrm{P} \,\mathrm{A}^{-1} \mathrm{~T}^{0}\right]$$

$$\left[\mathrm{P} \,\mathrm{A}\mathrm{~T}^{-1}\right]$$

$$\left[\mathrm{P}\,\mathrm{A}^{-1} \mathrm{~T}\right]$$

$$\left[\mathrm{P} \,\mathrm{A}^{-1} \mathrm{~T}^{-1}\right]$$

JEE Main 2022 (Online) 30th June Morning Shift

MCQ (Single Correct Answer)

-1

If n main scale divisions coincide with (n + 1) vernier scale divisions. The least count of vernier callipers, when each centimetre on the main scale is divided into five equal parts, will be :

$${2 \over {n + 1}}$$ mm

$${5 \over {n + 1}}$$ mm

$${1 \over {2n}}$$ mm

$${1 \over {5n}}$$ mm

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