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
$$-15$$
COMEDK Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12