1
JEE Main 2022 (Online) 25th July Evening Shift
+4
-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 :

A
2
B
4
C
6
D
8
2
JEE Main 2022 (Online) 25th July Morning Shift
+4
-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 :

A
$$\left[\mathrm{P} \,\mathrm{A}^{-1} \mathrm{~T}^{0}\right]$$
B
$$\left[\mathrm{P} \,\mathrm{A}\mathrm{~T}^{-1}\right]$$
C
$$\left[\mathrm{P}\,\mathrm{A}^{-1} \mathrm{~T}\right]$$
D
$$\left[\mathrm{P} \,\mathrm{A}^{-1} \mathrm{~T}^{-1}\right]$$
3
JEE Main 2022 (Online) 30th June Morning Shift
+4
-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 :

A
$${2 \over {n + 1}}$$ mm
B
$${5 \over {n + 1}}$$ mm
C
$${1 \over {2n}}$$ mm
D
$${1 \over {5n}}$$ mm
4
JEE Main 2022 (Online) 27th June Evening Shift
+4
-1

The SI unit of a physical quantity is pascal-second. The dimensional formula of this quantity will be :

A
[ML$$-$$1T$$-$$1]
B
[ML$$-$$1T$$-$$2]
C
[ML2T$$-$$1]
D
[M$$-$$1L3T0]
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