1
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
$$\sqrt {1 + \sin A} = - \left( {\sin {A \over 2} + \cos {A \over 2}} \right)$$ is true, if
A
$${{3\pi } \over 2} < A < {{5\pi } \over 2}$$ only
B
$${\pi \over 2} < A < {{3\pi } \over 2}$$ only
C
$${{3\pi } \over 2} < A < {{7\pi } \over 2}$$
D
$$0 < A < {{3\pi } \over 2}$$
2
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
In triangle ABC, if $${{{{\sin }^2}A + {{\sin }^2}B + {{\sin }^2}C} \over {{{\cos }^2}A + {{\cos }^2}B + {{\cos }^2}C}} = 2$$, then the triangle is
A
right-angled
B
equilateral
C
isosceles
D
obtuse-angled
3
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Match List-I with List-II and select the correct answer using the code given below the lists

Image

A
A B C D
2 3 1 4
B
A B C D
2 3 4 1
C
A B C D
3 2 1 4
D
A B C D
3 2 4 1
4
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $$\sin A = {3 \over 5}$$, where $$450^\circ < A < 540^\circ $$, then $$\cos {A \over 2}$$ is equal to
A
$${1 \over {\sqrt {10} }}$$
B
$$ - \sqrt {{3 \over {10}}} $$
C
$${{\sqrt 3 } \over {\sqrt {10} }}$$
D
None of these
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