1
NDA 2016 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is a vector of unit length orthogonal to both the vectors $$\widehat i + \widehat j + \widehat k$$ and $$2\widehat i + 3\widehat j - \widehat k$$ ?
A
$${{ - 4\widehat i + 3\widehat j - \widehat k} \over {\sqrt {26} }}$$
B
$${{ - 4\widehat i + 3\widehat j + \widehat k} \over {\sqrt {26} }}$$
C
$${{ - 3\widehat i + 2\widehat j - \widehat k} \over {\sqrt {14} }}$$
D
$${{ - 3\widehat i + 2\widehat j + \widehat k} \over {\sqrt {14} }}$$
2
NDA 2016 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If a, b and c are the position vectors of the vertices of an equilateral triangle whose orthocentre is at the origin, then which one of the following is correct?
A
a + b + c = 0
B
a + b + c = unit vector
C
a + b = c
D
a = b + c
3
NDA 2016 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the area of the parallelogram having diagonals $$3\widehat i + \widehat j - 2\widehat k$$ and $$\widehat i - 3\widehat j + 4\widehat k$$ ?
A
5$$\sqrt 5 $$ sq. units
B
4$$\sqrt 5 $$ sq. units
C
5$$\sqrt 3 $$ sq. units
D
15$$\sqrt 2 $$ sq. units
4
NDA 2016 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Let $$\widehat a$$ and $$\widehat b$$ of two unit vectors and $$\theta$$ be the angle between them.
What is $$\cos \left( {{\theta \over 2}} \right)$$ equal to ?
A
$${{\left| {\widehat a - \widehat b} \right|} \over 2}$$
B
$${{\left| {\widehat a + \widehat b} \right|} \over 2}$$
C
$${{\left| {\widehat a - \widehat b} \right|} \over 4}$$
D
$${{\left| {\widehat a + \widehat b} \right|} \over 4}$$
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