a) $$\frac{4}{{\sqrt 3 }}$$
b) $$4\sqrt 3 $$
c) $$2\sqrt 2 $$
d) $$4$$
Answer: d
Explanation: Suppose AB is the ladder of length x m
OA = 2m, ∠OAB = 60°
$$\eqalign{
& {\text{In right }}\Delta AOB,\,\sec {60^ \circ } = \frac{x}{2} \cr
& \Rightarrow 2 = \frac{x}{2} \cr
& x = 4\,m \cr} $$
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