NEET Practice Questions

Q191.

A screw gauge has the least count of $0.01~\text{mm}$ and there are $50$ divisions in its circular scale. The pitch of the screw gauge is:

  • $0.25~\text{mm}$
  • $0.5~\text{mm}$
  • $1.0~\text{mm}$
  • $0.01~\text{mm}$
Exam: NEET – 2020
Q192. If $E$ and $G$  respectively, denote energy and gravitational constant, then  $\dfrac{E}{G}$  has the dimensions of:
  • $[ML^0T^0]$
  • $[M^2L^{-2}T^{-1}]$
  • $[M^2L^{-1}T^{0}]$
  • $[ML^{-1}T^{-1}]$
Exam: NEET – 2021
Q193.

A screw gauge gives the following readings when used to measure the diameter of a wire:
Main scale reading: $0$ mm
Circular scale reading: $52$ divisions 
Given that $1$ mm on the main scale corresponds to $100$ divisions on the circular scale, the diameter of the wire that can be inferred from the given data is:

  • $0.26$ cm
  • $0.052$ cm
  • $0.52$ cm
  • $0.026$ cm
Exam: NEET – 2021
Q194.

If force $[F]$ , acceleration $[A]$ and time $[T]$  are chosen as the fundamental physical quantities, then find the dimensions of energy:

  • $\left[FAT^{-1}\right]$
  • $\left[FA^{-1}T\right]$
  • $\left[FAT\right]$
  • $\left[FAT^{2}\right]$
Exam: NEET – 2021
Q195. The percentage error in the measurement of $g$ is:
(Given,   $g=\frac{4\pi^2L}{T^2},L=(10\pm0.1)~\text{cm, }T=(100\pm1)~\text s$ )
  • $2\%$
  • $5\%$
  • $3\%$
  • $7\%$
Exam: NEET – 2022
Q196. The physical quantity that has the same dimensional formula as pressure is:
  • Force
  • Momentum
  • Young’s modulus of elasticity
  • Coefficient of viscosity
Exam: NEET – 2022
Q197.

The determination of the value of acceleration due to gravity $(g)$ by simple pendulum method employs the formula,
  $g=4\pi^2\dfrac{L}{T^2}$
The expression for the relative error in the value of $g$ is:

  • $\dfrac{\Delta g}{g}=\dfrac{\Delta L}{L}+2\Big(\dfrac{\Delta T}{T}\Big)$
  • $\dfrac{\Delta g}{g}=4\pi^2\Big[\dfrac{\Delta L}{L}-2\dfrac{\Delta T}{T}\Big]$
  • $\dfrac{\Delta g}{g}=4\pi^2\Big[\dfrac{\Delta L}{L}+2\dfrac{\Delta T}{T}\Big]$
  • $\dfrac{\Delta g}{g}=\dfrac{\Delta L}{L}-2\Big(\dfrac{\Delta T}{T}\Big)$
Exam: NEET – 2022
Q198.

When the circular scale of a screw gauge completes $2$ rotations, it covers $1$ mm over the pitch scale. The total number of circular scale divisions is $50.$  The least count of the screw gauge in metres is:

  • $10^{-4}$
  • $10^{-5}$
  • $10^{-2}$
  • $10^{-3}$
Exam: NEET – 2022
Q199. The area of a rectangular field (in $\text{m}^2$ ) of length $55.3$ m and breadth $25$ m after rounding off the value, for correct significant digits is:
  • $14\times10^{2}$
  • $138\times10^{1}$
  • $1382$
  • $1382.5$
Exam: NEET – 2022
Q200. The dimensions  $[MLT^{-2}A^{-2}]$ belong to the:
  • electric permittivity
  • magnetic flux
  • self-inductance
  • magnetic permeability
Exam: NEET – 2022
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