1
BITSAT 2022
MCQ (Single Correct Answer)
+3
-1

The smallest positive integral value of n such that $${\left[ {{{1 + \sin {\pi \over 8} + i\cos {\pi \over 8}} \over {1 + \sin {\pi \over 8} - i\cos {\pi \over 8}}}} \right]^n}$$ is purely imaginary, is equal to

A
4
B
3
C
2
D
8
2
BITSAT 2022
MCQ (Single Correct Answer)
+3
-1

Given that a house forms a right angle view from a window of another house, and the angle of elevation from the base of the first house to the window is 60 degrees. If the separation between the two houses is 6 meters, calculate the height of the first house.

A
8$$\sqrt3$$ m
B
6$$\sqrt3$$ m
C
4$$\sqrt3$$ m
D
None of these
3
BITSAT 2022
MCQ (Single Correct Answer)
+3
-1

A spherical balloon is filled with 4500$$\pi$$ cubic meters of helium gas. If a leak in the balloon causes the gas to escape at the rate of 72$$\pi$$ cubic meters per minute then the rate (in meters per minute) at which the radius of the balloon decreases 49 min after the leakage began is

A
$$\frac{9}{7}$$
B
$$\frac{7}{9}$$
C
$$\frac{2}{9}$$
D
9
4
BITSAT 2022
MCQ (Single Correct Answer)
+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
$${\left[ {{{{c^2} - {a^2}} \over {2ca}}} \right]^2}$$
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