MCQs on physic Vectors
1. What is the vertical component of the force 5 N acting on a particle along a direction making an angle of 600? (A) 3 N (B) 2.5 N (C) 10 N (D) 4 N Answer Answer: (B) 2.5 N 2. What is the direction of cosines of vector (vec{A}=2 hat{i}+4 hat{j}-5 hat{k} ?) Answer Answer: (A) (frac{2}{sqrt{45}}, frac{4}{sqrt{45}},-frac{5}{sqrt{45}}) 3. What is the minimum number of coplanar vectors with different magnitudes that can be added to get a resultant of zero? (A) 1 (B) 2 (C) 3 (D) 4 Answer Answer: (C) 3 4. A fly in the hall of dimensions 10 m×12 m×14 m starts to fly from one corner and ends up at the diametrically opposite corner. What is the magnitude of its flight? (A) 17 m (B) 20 m (C) 26 m (D) 36 m Answer Answer: (B) 20 m 5. Five equal forces of 10 N are applied at a point. If the angle between them is equal, what is the resultant force? (A) 10 N (B) 10√2N (C) 20 N (D) 0 Answer Answer: (D) 0 6. Any vector in an arbitrary direction can be replaced by two or three vectors (A) perpendicular ...
