RRB Technician Grade 1 Model Paper 2

Concept:The dimensional formula $ML^{2}T^{-2}$ represents energy or work.Heat is a form of energy, so it has the same dimension.Explanation:Any form of energy, including heat, has the dimension of work done.Work done $=$ Force $\times$ Distance $= (MLT^{-2})(L) = ML^{2}T^{-2}$.Einstein’s relation $E = mc^{2}$ also confirms this:$[E] = [M][L^{2}T^{-2}] = ML^{2}T^{-2}$.Now, check the other options:Impulse $=$ Force $\times$ Time $= MLT^{-1}$.Momentum $=$ Mass $\times$ Velocity $= MLT^{-1}$.Power $=$ Work / Time $= ML^{2}T^{-3}$.Only Heat matches the given dimension $ML^{2}T^{-2}$.Answer:D. Heat