1
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is (a $$-$$ b) $$\times$$ (a + b) equal to ?
A
0
B
a $$\times$$ b
C
2 (a $$\times$$ b)
D
| a |2 $$-$$ | b |2
2
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A spacecraft located at $$\widehat i + 2\widehat j + 3\widehat k$$ is subjected to a force $$\lambda \widehat k$$ by firing a rocket. The spacecraft is subjected to a moment of magnitude
A
$$\lambda$$
B
$$\sqrt 3 $$$$\lambda$$
C
$$\sqrt 5 $$$$\lambda$$
D
None of these
3
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
In a triangle ABC, if taken in order, consider the following statements

1. AB + BC + CA = 0

2. AB + BC $$-$$ CA = 0

3. AB $$-$$ BC + CA = 0

4. BA $$-$$ BC + CA = 0

How many of the above statement are correct?
A
One
B
Two
C
Three
D
Four
4
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If a and b are vectors such that | a | = 2, | b | = 7 and a $$\times$$ b = $$3\widehat i + 2\widehat j + 6\widehat k$$, then what is the acute angle between a and b?
A
30$$^\circ$$
B
45$$^\circ$$
C
60$$^\circ$$
D
90$$^\circ$$
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