Measurement MCQs for NEET — Physics Questions with Answers

The gravitational force between two bodies follows an inverse-square law, which means it is inversely proportional to the square of the distance between them. Mathematically, it is represented as $F \\propto r^{-2}$.

The correct matching is as follows:
(1) Space is isotropic - (S) Conservation of angular momentum.
(2) Space is homogeneous - (P) Conservation of linear momentum.
(3) Time is homogeneous - (Q) Conservation of energy.
(4) Time is isotropic - (R) Conservation of charge still not known.

Becquerel is a unit of radioactivity and not a unit of length. Other options such as light year, fermi, and $A^\circ$ (angstrom) are units of length.

$ { 10 \times 10 ^ {-6 } \over 10 ^ {-9}} = 10 ^ 4 $

In the International System of Units (SI), there are 7 fundamental units. These include meter (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electric current, kelvin (K) for temperature, mole (mol) for the amount of substance, and candela (cd) for luminous intensity.

Time is a fundamental physical quantity. Fundamental quantities are those that do not depend on other quantities and cannot be defined in terms of other physical quantities. The fundamental quantities in the SI system are length, mass, time, electric current, temperature, amount of substance, and luminous intensity.

Poise is the unit of viscosity. Viscosity is a measure of a fluid's resistance to deformation at a given rate, such as when it flows. The poise (symbol: P) is the unit of dynamic viscosity in the centimeter-gram-second (CGS) system of units.

The second is the unit of time and is the same in all unit systems. Time measurement is fundamental and does not change across different unit systems, whereas units like meter, ampere, and kilogram can vary in definition between systems such as the imperial and metric systems.

The SI (International System of Units) includes units for additional physical quantities beyond mass, length, and time, such as electric current (ampere), thermodynamic temperature (kelvin), amount of substance (mole), and luminous intensity (candela). This makes it different from systems like MKS (meter-kilogram-second), CGS (centimeter-gram-second), and FPS (foot-pound-second) which are primarily based on just mass, length, and time.