1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Assume that the earth moves around the sun in a circular orbit of radius R and there exists a planet which also move around the sun in a circular orbit with an angular speed twice as large as that of the earth. The earth of the orbit of the planet is
A
$${2^{ - 2/3}}$$ R
B
$${2^{ 2/3}}$$ R
C
$${2^{ - 1/3}}$$ R
D
$${R \over {\sqrt 2 }}$$
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
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%
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
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
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Two black bodies A and B have equal surface areas are maintained at temperatures 27$$^\circ$$C and 177$$^\circ$$C respectively. What will be the ratio of the thermal energy radiated per second by A to that by B?
A
4 : 9
B
2 : 3
C
16 : 81
D
27 : 177
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