To keep constant time, watches are fitted with balance wheel made of
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Column $-I$ Column $-II$ $(a)$ When temperature raised Young’s modulus of body $(i)$ Zero $(b)$ Young’s modulus for air $(ii)$ Infinite $(iii)$ Decreases $(iv)$Increases - 5Two wire $A$ and $B$ are stretched by same force. If, for $A$ and $B, Y_A: Y_B=1: 2, r_A: r_B=3: 1$ and $L_A: L_B=4: 1$, then ratio of their extension $\left(\frac{\Delta L_A}{\Delta L_B}\right)$ will be .............View Solution
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- 9The depth below the surface of sea to which a rubber ball be taken so as to decrease its volume by $0.02 \%$ is______ $\mathrm{m}$.View Solution
(Take density of sea water $=10^3 \mathrm{kgm}^{-3}$, Bulk modulus of rubber $=9 \times 10^8 \mathrm{Nm}^{-2}$, and $\mathrm{g}=10 \mathrm{~ms}^{-2}$ )
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