What is the minimum number of unequal magnitude vectors required to get a null vector?

Related Mcqs:

1. Null vector is a vector which has________________?

   A. Zero magnitude
   B. No specified direction
   C. Both A and B are correct
   D. Both A and B are not correct

2. Two vectors A and B are making angle θ with each other. The scalar projection of vector B on vector A is written as____________?

   A. A.B/A
   B. A.B/B
   C. A.cosθ
   D. Both a and b are correct

3. The cross product of two vectors is a negative vector when______________?

   A. They are parallel vectors
   B. They are anti parallel vectors
   C. They are a perpendicular vector
   D. They are rotated through 270°

4. The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?

   A. 30°
   B. 45°
   C. 60°
   D. 180°

5. Which of the following can not be the resultant of two vectors having magnitude 10N and 15N?

   A. 18N
   B. 22N
   C. 25N
   D. 30N

   Submitted by: Zahid Jagirani

6. The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________?

   A. 2i^ – 2j^ + k^
   B. (2i^ – 2j^ +k^)/9
   C. (2i^ – 2j^ +k^)/3
   D. (2i^ – 2j^ +k^)/5

7. For what value of “a” , the magnitude of a vector A= 2i^+j^+ak^ should be 3?

   A. -2
   B. 2
   C. 4
   D. Both A & B

   Submitted by: Zahid Jagirani

8. Two vectors are A = 3i^+2j^ -k^& B = 3i^-2j^ +k^ , then_____________?

   A. B is anti-parallel to A
   B. B is a negative vector of A
   C. B has a negative magnitude
   D. B is perpendicular to A

9. An angle between two vectors A and B can be determined by_____________?

   A. Their dot product
   B. Their cross product
   C. Head to tail rule
   D. Right-hand rule

10. Addition of vectors obeys_______law?

    A. Commutative Law
    B. Associative Law
    C. Distributive Law
    D. All of these

    Submitted by: Zahid Jagirani