Basic Maths and Units and DimensionsHard

Question

Match the LIST-I with LIST-II

List-I List-II
A. Spring constant I. $${ML}^{2}{\text{ }T}^{- 2}{\text{ }K}^{- 1}$$
B.

Thermal

conductivity

II. $${ML}^{0}{\text{ }T}^{- 2}$$
C. Boltzmann constant III. $${ML}^{2}{\text{ }T}^{- 3}{\text{ }A}^{- 2}$$
D. Inductive reactance IV. $${MLT}^{- 3}{\text{ }K}^{- 1}$$

Thermal

conductivity

Choose the correct answer from the options given below:

(1) A-II, B-I, C-IV, D-III

(2) A-I, B-IV, C-II, D-III

(3) A-III, B-II, C-IV, D-I

(4) A-II, B-IV, C-I, D-III

Solution

(A) $F = Kx$

$${\left\lbrack {MLT}^{- 2} \right\rbrack = \lbrack K\rbrack\lbrack L\rbrack }{\lbrack K\rbrack = {ML}^{0}{\text{ }T}^{- 2} }$$(B) Thermal conductivity

$${\frac{dQ}{dt} = \frac{kA}{\mathcal{l}}\Delta T }{{ML}^{2}{\text{ }T}^{- 3} = \frac{\lbrack k\rbrack L^{2}\text{ }K}{\text{ }L} }{\left\lbrack K^{1} \right\rbrack = {MLT}^{- 3}{\text{ }K}^{- 1} }$$(C) Boltzman constant

$$\lbrack K\rbrack = {ML}^{2}{\text{ }T}^{- 2}{\text{ }K}^{- 1} $$(D) Inductive reactance

$${\frac{\lbrack V\rbrack}{\lbrack I\rbrack} = \frac{{ML}^{2}{\text{ }T}^{- 3}{\text{ }A}^{- 1}}{\text{ }A} }{= {ML}^{2}{\text{ }T}^{- 3}{\text{ }A}^{- 2}}$$

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