1. . Which of the following is a scalar quantity?
(A) Velocity
(B) Energy
(C) Force
(D) Torque
2. . Which one is the vector quantity?
(A) Force
(B) Length
(C) Density
(D) Work
3. . A vector which has magnitude (one) is called
(A) Null vector
(B) Position vector
(C) Unit vector
(D) Negative vector
4. . The angle between two rectangular components of a vector is
(A) 90°
(B) 60°
(C) 30°
(D) 180°
5. . A force of 6N is acting along x–axis. Its y–component is
(A) 6N
(B) 3N
(C) 12N
(D) Zero
6. . Cos 60° has the value:
(A) 1
(B) 0.866
(C) 0.707
(D) 0.5
7. . If a vector A makes an angle θ with x–axis, its x-component is given by
(A) A Cosθ
(B) A tanθ
(C) A Sinθ
(D) A Cotθ
8. . If two vectors make an angle of 90° with each other, their scalar product is:
(A) 0
(B) 1
(C) 1
(D) 2
9. . The scalar product of two vectors A and B at an angle θ with each other is
(A) AB
(B) AB Sinθ
(C) AB tanθ
(D) AB Cosθ
10. . If vectors A and B are parallel to each other then
(A) A · B = 0
(B) A · B = 1
(C) A · B = -AB
(D) A · B = AB
11. . The cross product of vector A with itself (A × A) is
(A) Zero
(B) 1
(C) A
(D) A²
12. . In a right angle triangle, if one of its angle is 30° then the other will have value
(A) 0°
(B) 60°
(C) 30°
(D) 90°
13. . Which of these statements is correct?
(A) A · B = – B · A
(B) A · B = B · A
(C) A × B = B × A
(D) A · B ≠ B · A
14. . Time is example of
(A) Vector
(B) Negative of a vector
(C) Scalar
(D) Null vector