A ball suspended by a thread swings in a vertical plane, so that its acceleration in the extreme position and lowest position are equal. The angle $\theta$ of thread deflection in the extreme position will be
$\tan ^{-1}(2)$
$\tan ^{-1}(\sqrt{2})$
$\tan ^{-1}\left(\frac{1}{2}\right)$
$2 \tan ^{-1}\left(\frac{1}{2}\right)$
If the rotational kinetic energy of a body is increased by $300 \%$, then the percentage increase in its angular momentum will be
$10 \%$
$100 \%$
$150 \%$
$200 \%$
The average depth of Indian ocean is about 3000 m . The fractional compression, $\frac{\Delta V}{V}$ of water at the bottom of the ocean (given, that the Bulk modulus of the water $=2.2 \times 10^9 \mathrm{Nm} { }^{-2}$ and $g=10 \mathrm{~ms}^{-2}$ ) is
$0.82 \%$
$0.91 \%$
$1.36 \%$
$1.24 \%$
The following four wires of length $L$ and radius $r$ are made of the same material. Which of these will have the largest extension, when the same tension is applied?
$L=400 \mathrm{~cm}, r=0.8 \mathrm{~mm}$
$L=300 \mathrm{~cm}, r=0.6 \mathrm{~mm}$
$L=200 \mathrm{~cm}, r=0.4 \mathrm{~mm}$
$L=100 \mathrm{~cm}, r=02 \mathrm{~mm}$
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