October 2022

Q. Dimensions cannot be used to check dimensional correctness of a formula convert units find value of the constant of proportionality in an equation deduce a relation among physical quantities Answer: find value of the constant of proportionality in an equation

Q. Out of the following pairs, which one does not have identical dimensions ? Angular momentum and Planck’s constant Impulse and momentum Moment of inertia and moment of a force Work and torque Answer: Moment of inertia and moment of a force

Q. A student measures the distance covered and time taken by a body under free fall which was intially at rest. He uses this data for estimating g, the acceleration due to gravity. If the maximum percentage error in measurement of the distance and the time are e1 and e2 respectively, then the maximum possible

Q. Identify the pair whose dimensions are equal. Torque and work Stress and energy Force and stress Force and work Answer: Torque and work

Q. In the above question dimensions of b/c are the same as those of Wave velocity Wavelength Wave amplitude Wave frequency Answer: Wave velocity

Q. Unit for a fundamental physical quantity is defined as best of various reference standards the smallest measurable value of the physical quantity defined as average various reference standards reference standard for the physical quantity Answer: reference standard for the physical quantity

Q. One second is defined to be equal to 9192631770 periods of the cesium clock 1650763.73 periods of the cesium clock 652189.63 periods of the krypton clock 1650763.73 periods of the krypton clock Answer: 9192631770 periods of the cesium clock

Q9. In a system of units if force (F), acceleration (A) and time (T) are taken as fundamentals units then the dimensional formula of energy is FA2T FAT2 FA2T FAT Answer: FAT2

Q. Which of the following is a dimensional constant? Gravitational constant Dielectric constant Refractive index Relative density Answer: Gravitational constant