AIIMS Physics Units And Measurement Class 11 Questions

What is the dimension of Luminous flux:

Assertion : Number of significant figures in 0.005 is one and that in 0.500 is three. Reason : This is because zeros are not significant.

The velocity of water waves ($v$) may depend on their wavelength $\lambda$, the density of water $\rho$ and the acceleration due to gravity, $g$. The method of dimensions gives the relation between these quantities is

If force (F), length (L) and time (T) are assumed to be fundamental units, then the dimensional formula of the mass will be

The heat generated in a circuit is given by $Q = I^2Rt$, where $I$ is the current, $R$ is the resistance and $t$ is time. If the percentage errors in measuring $I$, $R$ and $t$ are 2%, 1% and 1% respectively, then the maximum error in measuring heat will be:

If the energy, E = Gⁿhⁿcⁿ, where G is the universal gravitational constant, h is the Planck's constant and c is the velocity of light, then the values of p, q and r are, respectively

Which of the following pairs does not have same dimensions?

The dimensional formula of Planck's constant is

Which of the following physical quantities do not have same dimensions?

“Parsec” is the unit of

Dimension of electrical resistance is

Using mass (M), length (L), time (T) and current (A) as fundamental quantities, the dimension of permittivity is

Length cannot be measure by

The dimension of torque is

If vectors P = ai + aj + 3k and Q = ai - 2j - k are perpendicular to each other, then the positive value of a is

Assertion : S.I. units are logical and coherent. Reason : S.I. system of units is a rationalised system.

Speed in kilometer per hour in S.I. unit is represented as

Which of the following physical quantities do not have same dimensions?

S.I. unit of velocity is

A body of mass 20.00 g has volume 5.0 cm³. The maximum possible error in the measurement of mass and volume respectively are 0.01 and 0.1 cm³. The percentage error in density will be nearest to