1
JEE Main 2014 (Offline)
+4
-1
An open glass tube is immersed in mercury in such a way that a length of $$8$$ $$cm$$ extends above the mercury level. The open end of the tube is then closed and scaled and the tube is raised vertically up by additional $$46$$ $$cm$$. What will be length of the air column above mercury in the tube now? (Atmospheric pressure $$=76$$ $$cm$$ of $$Hg$$)
A
$$16$$ $$cm$$
B
$$22$$ $$cm$$
C
$$38$$ $$cm$$
D
$$6$$ $$cm$$
2
JEE Main 2014 (Offline)
+4
-1
The pressure that has to be applied to the ends of a steel wire of length $$10$$ $$cm$$ to keep its length constant when its temperature is raised by $${100^ \circ }C$$ is: (For steel Young's modulus is $$2 \times {10^{11}}\,\,N{m^{ - 2}}$$ and coefficient of thermal expansion is $$1.1 \times {10^{ - 5}}\,{K^{ - 1}}$$ )
A
$$2.2 \times {10^8}\,\,Pa$$
B
$$2.2 \times {10^9}\,\,Pa$$
C
$$2.2 \times {10^7}\,\,Pa$$
D
$$2.2 \times {10^6}\,\,Pa$$
3
JEE Main 2014 (Offline)
+4
-1
On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius $$R$$ and making a circular contact of radius $$r$$ with the bottom $$R$$ and making a circular contact of radius $$r$$ with the bottom of the vessel. If $$r < < R$$ and the surface tension of water is $$T,$$ value of $$r$$ just before bubbles detach is: (density of water is $${\rho _w}$$)
A
$${R^2}\sqrt {{{{\rho _w}g} \over {3T}}}$$
B
$${R^2}\sqrt {{{{\rho _w}g} \over {6T}}}$$
C
$${R^2}\sqrt {{{{\rho _w}g} \over {T}}}$$
D
$${R^2}\sqrt {{{{2\rho _w}g} \over {3T}}}$$
4
JEE Main 2014 (Offline)
+4
-1
There is a circular tube in a vertical plane. Two liquids which do not mix and of densities $${d_1}$$ and $${d_2}$$ are filled in the tube. Each liquid subtends $${90^ \circ }$$ angle at center. Radius joining their interface makes an angle $$\alpha$$ with vertical. Radio $${{{d_1}} \over {{d_2}}}$$ is :
A
$${{1 + \sin \,\alpha } \over {1 - \sin \,\alpha }}$$
B
$${{1 + \cos \,\alpha } \over {1 - \cos \,\alpha }}$$
C
$${{1 + \tan \,\alpha } \over {1 - \tan \,\alpha }}$$
D
$${{1 + \sin \,\alpha } \over {1 - \cos \,\alpha }}$$
EXAM MAP
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