JEE Exam  >  JEE Notes  >  Chapter-wise Tests for JEE Main & Advanced  >  JEE Advanced (One or More Correct Option): Vector Algebra

JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced PDF Download

Q.1. If  JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced are non-coplanar vectors such that JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced and JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced then
(a) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(b) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(c) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(d) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

Correct Answer is option (a, c, d)
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced


Q.2. JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced are unit vector such that JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced mutually perpendicular and JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is equally inclined to JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced at an angle θ. If JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced then 
(a) z2 = 1 - 2y2
(b) z2 = 1 - x2 - y2 
(c) z2 = 1 - 2x2 
(d) x2 = y2

Correct Answer is option (a, b, c, d)
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced Hence a, b, c, d.]
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
Multiplying both sides scalarly by JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
cos θ = x .1 + 0 + 0 = x ,  cosq = y.1 = y  
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced = x.0 + y.0 + z(a × (b)2 = z.1 = z [a b c] = z
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
∴ z2 = 1 - 2x2 = 1 - 2y2
Also, x2 = y2 


Q.3. Let JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced be three vectors. A vector in the plane of JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced whose projection on JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is of magnitude √2/3 is
(a) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced 
(b) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(c) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(d) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

Correct Answer is option (a, c)
Let the required vector be JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced For this to be coplanar with JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced we must have
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
⇒ x(-4 + 1) + y(-1 + 2) + z(1 - 2) = 0
⇒ -3x + y - z = 0         ....(1)
The projection of
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
The choices (a) and (c) satisfy the equations (1) and (2).


Q.4. Which of the following statements is/are correct?
(a) If JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced and JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced for some non-zero vectors JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced then JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

= 0

(b) There exist a vector making angles 30º and 45º with x and y axes respectively.
(c) Locus of point for which x = 3 and y = 4 is a line parallel to the z-axis whose distance from the z-axis, is 5.
(d) The vertices of a regular tetrahedron are O, A, B, C where 'O' is the origin.  The vector JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is perpendicular the plane ABC.

Correct Answer is option (a, c, d)
(a) since JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced are coplanar
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(b) cos230º + cos245º + cos2γ = 1
∴ sin2g = JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced which is not possible.
(c) Obvious
(d) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
i.e., JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is perpendicular to the plane ABC.
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
Hence, the statement is true.


Q.5. If JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced then the vector JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is orthogonal to -
(a) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(b) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(c) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(d) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

Correct Answer is option (a, d)
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced and this is orthogonal to JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is also orthogonal to JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced


Q.6. Let the unit vector JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced are perpendicular and the moduli vector JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced inclined at an angle α to JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(a) λ = m
(b) n2 = 1 – 2λ2
(c) n2 = - cos 2α
(d) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

Correct Answer is option (a, b, c, d)
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
angle between JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced = angle between JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced 

JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
⇒ m = λ= cos α
⇒ 1 = 2λ2 + n2 ⇒ n2 = 1 - 2λ2 = 1 - 2cos2α
= - cos2α
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
Hence, all are correct.


Q.7. Let A be vector parallel to the line of intersection of planes P1 and P2 through origin. P1 is parallel to the vectors 2j + 3k and 4j – 3k and P2 is parallel to j – k and 3i + 3j, then the angle between A and 2i + j – 2k is -
(a) π/2
(b) π/4
(c) p/6
(d) 3p/4

Correct Answer is option (b, d)
vector JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is parallel to
[(2j + 3k) × (4j – 3k)] × [(j – k) × (3i + 3j)] ⇒ 54 (j – k)
If θ is the required angle then  
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced


Q.8. If the vectors JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced are coplanar, then -
(a) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(b) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(c) JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
(d) None of these

Correct Answer is option (a, b, c)
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced are coplanar and hence JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
Also scalars exist such that JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
Taking the dot product with JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
Eliminating l, m, n, we have JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
Taking dot product with JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced and eliminating λ, m, n we get the other determinant equal to zero.


Q.9. The vectors JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced = 3i + 2j + 2k & JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced = –i – 2k are adjacent sides of a parallelogram then angle between diagonals is
(a) 60°
(b) 45°
(c) 90°
(d) 135°

Correct Answer is option (b, d)
Θ The diagonals JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
= 2i + 2j
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
∴ Angle between diagonals is
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced


Q.10. Tangents are drawn to circle x2 + y2 = 32 from a point A lying on x-axis. The tangent cut y- axis at point B & C then coordinates of A such that area of DABC is minimum may be
(a) (8, 0)
(b) (6, 0)
(c) (–8, 0)
(d) (–6, 0)

Correct Answer is option (a, b)
OM = 4√2
JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
OA = 4√2 sec a
BC = 2OB = 8√2 cosec α
∴  Area of JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced
For min. area a = π/4
∴  Point A is (8, 0) symmetrically A'(-8, 0)

The document JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced is a part of the JEE Course Chapter-wise Tests for JEE Main & Advanced.
All you need of JEE at this link: JEE
Are you preparing for JEE Exam? Then you should check out the best video lectures, notes, free mock test series, crash course and much more provided by EduRev. You also get your detailed analysis and report cards along with 24x7 doubt solving for you to excel in JEE exam. So join EduRev now and revolutionise the way you learn!
Sign up for Free Download App for Free
446 docs|930 tests

Up next

Up next

Explore Courses for JEE exam
Related Searches

ppt

,

Free

,

Viva Questions

,

JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

,

MCQs

,

Extra Questions

,

Previous Year Questions with Solutions

,

practice quizzes

,

mock tests for examination

,

JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

,

shortcuts and tricks

,

Semester Notes

,

Summary

,

past year papers

,

JEE Advanced (One or More Correct Option): Vector Algebra | Chapter-wise Tests for JEE Main & Advanced

,

Exam

,

study material

,

video lectures

,

Important questions

,

pdf

,

Objective type Questions

,

Sample Paper

;