1
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

A boat crosses a river from part $$A$$ to part $$B$$, which are just on the opposite side. The speed of the water. $$v_\omega$$ and the of boat is $$v_B$$ relative to still water. Assume $$v_B=\sqrt{2} v_\omega$$. What is the time taken by the boat, if it has to cross the river directly on the $$A B$$ line ($$D=$$ width of the river) ?

A
$$\frac{2 D}{\sqrt{3} v_B}$$
B
$$\frac{\sqrt{3} D}{2 v_B}$$
C
$$\frac{D}{\sqrt{2} v_B}$$
D
$$\frac{\sqrt{2} D}{v_B}$$
2
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

Two rings of radius $$R$$ and $$n R$$ made of same material have the ratio of moment of inertia about an axis passing through centre is $$1: 64$$. The value of $$n$$ is

A
2
B
2$$\sqrt2$$
C
4
D
1/2
3
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

When a string is divided into four segments of $$l_1, l_2, l_3$$ and $$l_4$$. The fundamental frequencies of these three segments are $$v_1, v_2, v_3$$ and $$v_4$$, respectively. The original fundamental frequency $$(v)$$ of the string is

A
$$\sqrt{v}=\sqrt{v_1}+\sqrt{v_2}+\sqrt{v_3}+\sqrt{4}$$
B
$$v=v_1+v_2+v_3+v_4$$
C
$$1 / v=1 / v_1+1 / v_2+1 / v_3+1 / v_4$$
D
$$\frac{1}{\sqrt{v}}=\frac{1}{\sqrt{v_1}}+\frac{1}{\sqrt{v_2}}+\frac{1}{\sqrt{v_3}}+\frac{1}{\sqrt{v_4}}$$
4
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

A charged particle moving in a uniform magnetic field and losses $$16 \%$$ of its kinetic energy. The radius of curvature of its path changes by

A
8%
B
4%
C
10%
D
16%
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