ECAT Pre Engineering Mathematic MCQ Test With Answer for Chapter 23 (Conic Section)

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ECAT Mathematics Chapter 23 Important MCQ's

Sr.#	Question	Answer
1	If|a| =|b| = |a+b|=1, then|a-b| is equal to:	A. 1 B. √3 C. √2 D. 7
2	If the sum of two unit vectors is a unit vector the the magnitude of their difference is	A. √2 B. √3 C. 1 D. None of these
3	The vector k = [0,0,1] is called unit vector along:	A. x -axis B. y - axis C. z- axis D. None of these
4	The modulus of 12-5i is:	A. 7 B. 13 C. √7 D. 119
5	If m and n be two scalars, then (m+n) g =	A. 0 B. m+n C. m▁a+n▁a D. ma - m▁a
6	If u = xi + yj, then|u|	A. x2 + y2 B. (x2 +y2)2 C. x2-y2 D. √(x2+y2)
7	The angle between the vectors u =2i - i + k and v = -i + i is:	A. 3π/2 B. 2π/3 C. 5π/6 D. π/3
8	The magnitude of vector a=i-3j+5k is:	A. 3 B. √35 C. √17 D. √35
9	If u = 2ai + i - k and v = i +ai + 4k are perpendicular then a =	A. 4 B. 1/2 C. 3 D. 4/3
10	The modulus of a vector i-i+ k is:	A. √3 B. 1 C. √2 D. ∞