1
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Two wires are made of the same material and have the same volume. However wire $$1$$ has cross-sectional area $$A$$ and wire $$2$$ has cross-sectional area $$3A.$$ If the length of wire $$1$$ increases by $$\Delta x$$ on applying force $$F,$$ how much force is needed to stretch wire $$2$$ by the same amount?
A
$$4F$$
B
$$6F$$
C
$$9F$$
D
$$F$$
2
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
A spherical solid ball of volume $$V$$ is made of a material of density $${\rho _1}$$. It is falling through a liquid of density $${\rho _2}\left( {{\rho _2} < {\rho _1}} \right)$$. Assume that the liquid applies a viscous force on the ball that is proportional to the square of its speed $$v,$$ i.e., $${F_{viscous}} = - k{v^2}\left( {k > 0} \right).$$ The terminal speed of the ball is
A
$$\sqrt {{{Vg\left( {{\rho _1} - {\rho _2}} \right)} \over k}}$$
B
$${{{Vg{\rho _1}} \over k}}$$
C
$$\sqrt {{{Vg{\rho _1}} \over k}}$$
D
$${{Vg\left( {{\rho _1} - {\rho _2}} \right)} \over k}$$
3
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
A capillary tube (A) is dipped in water. Another identical tube (B) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?
A
B
C
D
4
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
A jar is filled with two non-mixing liquids $$1$$ and $$2$$ having densities $${\rho _1}$$ and $${\rho _2}$$ respectively. A solid ball, made of a material of density $${\rho _3}$$, is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for $${\rho _1}$$ , $${\rho _1}$$ and $${\rho _3}$$ ?
A
$${\rho _3} < {\rho _1} < \rho {}_2$$
B
$${\rho _1} > {\rho _3} > \rho {}_2$$
C
$${\rho _1} < {\rho _2} < \rho {}_3$$
D
$${\rho _1} < {\rho _3} < \rho {}_2$$
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