When a certain vector is multiplied by -1, the direction changes by:
Correct answer: B. 180°
- A. 90°
- B. 180°
- C. 120°
- D. 60°
Explanation
When a certain vector is multiplied by -1, the direction changes by 180°. Let's go through the options to understand why: (a) 90°: Multiplying a vector by -1 doesn't change the direction by 90°, so option (a) is incorrect. (b) 180°: When a vector is multiplied by -1, it flips or reverses its direction completely, which is a change of 180°. So, option (b) is correct! (c) 120°: Multiplying a vector by -1 doesn't change the direction by 120°, so option (c) is incorrect. (d) 60°: Multiplying a vector by -1 doesn't change the direction by 60°, so option (d) is incorrect. Therefore, the correct option is (b) - 180°.
Last updated
About Vectors and Equilibrium
Vectors have magnitude and direction, unlike scalars, and are combined by head-to-tail or parallelogram methods. Work covers rectangular components, equilibrium when the resultant force is zero, the scalar product for work and projections, and the vector product for torque and cross-product direction using the right-hand rule.
Practise Vectors and Equilibrium
431 free Vectors and Equilibrium MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A.B = B.A =_.
A body will be in translational equilibrium if the vector sum of all the forces acting on it is:
A constant force F= 2i + 3j +4k is applied on a body. What will be the work done to move the body 5m in the z-direction?
A force F of magnitude 20N is acting on an object making an angle of 30° with the X-axis. Its Fy component is
A force of 10N is acting along y-axis. Its component along x-axis is