Units & Measurement — JEE Main PYQs

A spectrometer gives the following reading when used to measure the angle of a prism.

Main scale reading: 58.5 degree
Vernier scale reading : 09 divisions
Given that 1 division on main scale corresponds to 0.5 degree. Total divisions on the vernier scale is 30 and match with 29 …

A screw gauge gives the following reading when used to measure the diameter of a wire.

Main scale reading : 0 mm
Circular scale reading : 52 divisions
Given that 1 mm on main scale corresponds to 100 divisions of the circular scale.
The diameter of wire from the above date is :

The respective number of significant figures for the numbers $23.023,0.0003$ and $2.1\times 10^{-3}$ are

In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree ($=0.5^{\circ }$), then the least count of the instr …

The dimension of magnetic field in $\mathrm{M},\mathrm{L},\mathrm{T}$ and C (Coulomb) is given as

A body of mass $\mathrm{m}=3.513\mathrm{kg}$ is moving along the x-axis with a speed of $5.00{\mathrm{ms}}^{-1}$. The magnitude of its momentum is recorded as

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distance are measured by

Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of -0.03 mm while measuring the diameter of a thin wire, a stude …

Which of the following units denotes the dimensions $M{L}^2/Q^2$, where $Q$ denotes the electric charge?

Out of the following pair, which one does NOT have identical dimensions is