1
JEE Main 2021 (Online) 26th August Morning Shift
+4
-1
Out of Syllabus
A plane P contains the line $$x + 2y + 3z + 1 = 0 = x - y - z - 6$$, and is perpendicular to the plane $$- 2x + y + z + 8 = 0$$. Then which of the following points lies on P?
A
($$-$$1, 1, 2)
B
(0, 1, 1)
C
(1, 0, 1)
D
(2, $$-$$1, 1)
2
JEE Main 2021 (Online) 27th July Evening Shift
+4
-1
Out of Syllabus
For real numbers $$\alpha$$ and $$\beta$$ $$\ne$$ 0, if the point of intersection of the straight lines

$${{x - \alpha } \over 1} = {{y - 1} \over 2} = {{z - 1} \over 3}$$ and $${{x - 4} \over \beta } = {{y - 6} \over 3} = {{z - 7} \over 3}$$, lies on the plane x + 2y $$-$$ z = 8, then $$\alpha$$ $$-$$ $$\beta$$ is equal to :
A
5
B
9
C
3
D
7
3
JEE Main 2021 (Online) 27th July Morning Shift
+4
-1
Out of Syllabus
Let the plane passing through the point ($$-$$1, 0, $$-$$2) and perpendicular to each of the planes 2x + y $$-$$ z = 2 and x $$-$$ y $$-$$ z = 3 be ax + by + cz + 8 = 0. Then the value of a + b + c is equal to :
A
3
B
8
C
5
D
4
4
JEE Main 2021 (Online) 25th July Morning Shift
+4
-1
Out of Syllabus
Let the foot of perpendicular from a point P(1, 2, $$-$$1) to the straight line $$L:{x \over 1} = {y \over 0} = {z \over { - 1}}$$ be N. Let a line be drawn from P parallel to the plane x + y + 2z = 0 which meets L at point Q. If $$\alpha$$ is the acute angle between the lines PN and PQ, then cos$$\alpha$$ is equal to ________________.
A
$${1 \over {\sqrt 5 }}$$
B
$${{\sqrt 3 } \over 2}$$
C
$${1 \over {\sqrt 3 }}$$
D
$${1 \over {2\sqrt 3 }}$$
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