Units And Measurements - Mechanics - Physics Previous Year Questions

Suppose refractive index \(\alpha\) is given as \(\alpha = A + {B \over {{\lambda ^2}}}\), where A and B are constants and \(\lambda\) is wavelength, then dimensions of B are same as that of

Which of the following statement is incorrect?

Which of the following technique is not used for measuring small time intervals?

The relative errors in the measurement of two lengths 1.02 cm \(\pm\) 0.01 cm and 9.89 cm \(\pm\) 0.01 cm is

A tentative explanation of observations without assuming that it is true is called

The time dependence of a physical quantity P is give by \(\mathrm{P=P}_0 \exp \left(-\alpha t^2\right)\) where \(\alpha\) is a constant and \(t\) is time. The constant \(\alpha\) will

If units of mass, length and gravitational constant are chosen to fundamental units, the dimensions of time would be

The dimension \([\mathrm{ML}^{-1} \mathrm{~T}^{-2}]\) is the physical quantity of

Find the value of '\(n\)' in the given equation \(P=\rho^n v^2\) where '\(P\)' is the pressure, '\(\rho\)' density and '\(v\)' velocity.

Which of the given dimensional formula represents heat capacity

The nuclear forces

a. are central forces, independent of the spin of the nucleons.

b. have a short-range dominant over a distance of about a few fermi

c. are stronger being hundred times stronger than that of electromagnetic forces.

d. are independent of the nuclear charge.

Which of the above is not true?