Physical World Units and Measurements - Result Question 7
7. Dimensions of stress are :
[2020]
(a) $[ML^{2} T^{-2}]$
(c) $[ML^{-1} T^{-2}]$
(b) $[ML^{0} T^{-2}]$
(d) $[MLT^{-2}]$
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Answer:
Correct Answer: 7. (a)
Solution:
- (c) Stress $=\frac{\text{ Force }}{\text{ Area }}$
Dimensions of force $=[MLT^{-2}]$
Dimensions of area $=[L^{2}]$
$\therefore$ Stress $=\frac{[MLT^{-2}]}{[L^{2}]}=[ML^{-1} T^{-2}]$
