1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

If $$a = 2\widehat i + 3\widehat j - \widehat k,b = \widehat i + 2\widehat j - 5\widehat k,c = 3\widehat i + 5\widehat j - \widehat k$$, then a vector perpendicular to a and in the plane containing b and c is

A
$$17\widehat i + 21\widehat j - 123\widehat k$$
B
$$ - 17\widehat i + 21\widehat j - 97\widehat k$$
C
$$ - 17\widehat i - 21\widehat j - 97\widehat k$$
D
$$ - 17\widehat i - 21\widehat j + 97\widehat k$$
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

OA and BO are two vectors of magnitudes 5 and 6 respectively. If $$\angle BOA=60^\circ$$, then OA . OB is equal to

A
15
B
0
C
15$$\sqrt3$$
D
$$-15$$
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Graduate Aptitude Test in Engineering
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