86. Dimension of velocity gradient is :

^{0}L

^{0}T

^{–1}

^{–1}T

^{–1}

^{0}L T

^{–1}

^{0}T

^{–1}

87. Which of the following is the dimensions of the coefficient of friction?

^{2}L

^{2}T

^{0}L

^{0}T

^{0}

^{2}T

^{–2}

^{2}L

^{2}T

^{–2}

88. The dimensional formula for thermal resistance is :

^{2}T

^{–3 }K

^{–1}

^{2}T

^{–2 }K

^{–1}

^{2}T

^{–3 }K

^{–2}

^{–1}L

^{–2}T

^{3}

^{ }K

89. Dimensions of relative density is :

^{–2}

^{–3}

^{2}L

^{–6}

90. The dimensional representation of specific resistance in terms of charge Q is :

(a) M L ^{3} T ^{–1 }Q ^{–2}

(b) M L ^{2} T ^{–2 }Q ^{2}

(c) M L T ^{–2 }Q ^{–1}

(d) M L ^{2} T ^{–2 }Q ^{–1}

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