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Physics
Multiple Choice Question with Two or More Choices Correct Which of the following is a null vector? (a) Velocity vector of a body moving in a circle with a uniform speed (b) Velocity vector of a body moving in a straight line with a uniform speed (c) Position vector of the origin of a rectangular coordinate system (d) Displacement vector of a stationary object
Chemistry
Fill in the Blank : The catalyst octacarbonyldicobalt reduces the aldehyde RCHO to ............ .
Mathematics
One side of a rectangle lies along the line 4x + 7y + 5 = 0. Two of its vertices are (-3, 1) and (1, 1).