1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
A compressive force is applied to a uniform rod of rectangular cross-section so that its length decreases by 1%. If the Poisson's ratio for the material of the rod be 0.2, which of the following statements is correct?

"The volume approximately ................."
A
decreases by 1%
B
decreases by 0.8%
C
decreases by 0.6%
D
increases by 0.2%
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
A small spherical body of radius r and density $$\rho$$ moves with the terminal velocity v in a fluid of coefficient of viscosity $$\eta$$ and density $$\sigma$$. What will be the net force on the body?
A
$${{4\pi } \over 3}{r^3}(\rho - \sigma )$$
B
6$$\pi$$$$\eta$$rv
C
Zero
D
Infinity
3
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
The stress along the length of a rod (with rectangular cross-section) is 1% of the Young's modulus of its material. What is the approximate percentage of change of its volume? (Poisson's ratio of the material of the rod is 0.3).
A
3%
B
1%
C
0.7%
D
0.4%
4
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
What will be the approximate terminal velocity of a rain drop of diameter $${1.8 \times {{10}^{ - 3}}}$$ m, when density of rain water $$\approx$$ $${1.8 \times {{10}^{ - 5}}}$$ N-sm$$-$$2 (Neglect buoyancy of air)
A
49 ms$$-$$1
B
98ms$$-$$1
C
392 ms$$-$$1
D
980 ms$$-$$1
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