1
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

A piece of wood is floating in water. When the temperature of water rises, the apparent weight of the wood will

A
increase
B
decrease
C
may increase or decrease
D
remain same
2
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

One end of a stecl wire is fixed to the ceiling of an elevator moving up with an acceleration $2 \mathrm{~m} / \mathrm{s}^2$ and a load of 10 kg hangs from the other end. If the cross section of the wire is $2 \mathrm{~cm}^2$, then the longitudinal strain in the wire will be ( $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ and $\mathrm{Y}=2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^2$ )

A
$4 \times 10^{11}$
B
$8 \times 10^{-6}$
C
$3 \times 10^{-6}$
D
$2 \times 10^{-6}$
3
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Three different liquids are filled in a U-tube as shown in figure. Their densities are $\rho_1, \rho_2$ and $\rho_3$ respectively. From the figure we may conclude that

A
$p_3=4\left(\rho_2-\rho_1\right)$
B
$\rho_3=4\left(\rho_1-\rho_2\right)$
C
$\rho_3=2\left(\rho_2-\rho_1\right)$
D
$\rho_3=\frac{\rho_1+\rho_2}{2}$
4
WB JEE 2025
MCQ (Single Correct Answer)
+2
-0.5
Change Language

A piece of granite floats at the interface of mercury and water contained in a beaker as in figure. If the densities of granite, water and mercury are $\rho, \rho_1$ and $\rho_2$ respectively, the ratio of the volume of granite in water to the volume of granite in mercury is

A
$\frac{\rho_2-\rho}{\rho-\rho_1}$
B
$\frac{\rho_2+\rho}{\rho_1+\rho}$
C
$\frac{\rho_1 \rho_2}{\rho}$
D
$\frac{\rho_1}{\rho_2}$
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