831. The rectangular coordinate system is also called
A. Polar coordinate system
B. Cartesian coordinate system
C. Cylindrical coordinate system
D. Spherical coordinate system

832. The direction of a vector in space is specified by
A. One angle
B. Two angle
C. Three angle
D. No angle

833. Addition of vector obeys
A. Commutative law
B. Distributive law
C. Associative law
D. All given laws in A, B and C

834. A vector can be multiplied by a number. The number may be
A. Dimensionless
B. Dimensional scalar
C. Negative
D. All A, B and C are correct

835.. Unit vector n^ is along
A. X-axis
B. Normal on a surface
C. Y-axis
D. Z-axis

836. Cosθi^ + Sinθj^ is a
A. Vector
B. Position Vector
C. Vector in the direction at angle θ with an x-axis
D. The unit vector in the direction at angle θ with an x-axis

837. Maximum number of rectangular components are
A. 1
B. 2
C. 3
D. 4

838. Maximum number of components of a vector may be
A. 1
B. 2
C. 3
D. Infinite

839. Which one is not correct for a vector A= 2i+2j+3k?
A. Has direction 45° with an x-axis
B. Has magnitude 2
C. Has magnitude 2 and direction °=45° with a y-axis
D. Has magnitude -2

840. The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is
A. 30°
B. 60°
C. 90°
D. 120°