MCQ
When temperature increases, the frequency of a tuning fork
- AIncreases
- ✓Decreases
- CRemains same
- DIncreases or decreases depending on the material
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( Atmospheric pressure = $76\ cm$ of $Hg$)

$1.$ The speed of the block when it reaches the point $Q$ is :
$(A)$ $5 \ ms ^{-1}$ $(B)$ $10 \ ms ^{-1}$$(C)$ $10 \sqrt{3} \ ms ^{-1}$ $(D)$ $20 \ ms ^{-1}$
$2.$ The magnitude of the normal reaction that acts on the block at the point $Q$ is :
$(A)$ $7.5 \ N$ $(B)$ $8.6 \ N$ $(C)$ $11.5 \ N$ $(D)$ $22.5 \ N$
Give the answer question $1$ and $2.$
