1
BITSAT 2022
+3
-1

Let $$\alpha$$ be the solution of $${16^{{{\sin }^2}\theta }} + {16^{{{\cos }^2}\theta }} = 10$$ in $$\left( {0,{\pi \over 4}} \right)$$. If the shadow of a vertical pole is $${1 \over {\sqrt 3 }}$$ of its height, then the altitude of the sun is

A
$$\alpha$$
B
$${\alpha \over 2}$$
C
$$2\alpha$$
D
$${\alpha \over 3}$$
2
BITSAT 2022
+3
-1

A house subtends a right angle at the window of a opposite house and the angle of elevation of the window from the bottom of the first house is 60. If the distance between two houses be 6 m, then the height of the first house is

A
8$$\sqrt3$$ m
B
6$$\sqrt3$$ m
C
4$$\sqrt3$$ m
D
None of these
3
BITSAT 2022
+3
-1

If in a $$\Delta$$ABC, 2b2 = a2 + c2, then $$\frac{\sin 3B}{\sin B}$$ is equal to

A
$${{{c^2} - {a^2}} \over {2ca}}$$
B
$${{{c^2} - {a^2}} \over {ca}}$$
C
$${{{{({c^2} - {a^2})}^2}} \over {{{(ca)}^2}}}$$
D
$${\left[ {{{{c^2} - {a^2}} \over {2ca}}} \right]^2}$$
4
BITSAT 2021
+3
-1

The height of the chimney when it is found that on walking towards it 50 m in the horizontal line through its base, the angle of elevation of its top changes from 30$$^\circ$$ to 60$$^\circ$$ is :

A
25 m
B
25$$\sqrt2$$ m
C
25$$\sqrt3$$ m
D
None of these
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