Motion and Time Multiple Choice Questions and Answers

11. The resultant of two vectors is the smallest when the angle between them is

1. 90 degree
2. 45 degree
3. 180 degree
4. 0 degree

12. Three forces, each having a magnitude of 30 N, pull on an object in directions that are 120^o apart from each other. Make a statement concerning the resultant force.

1. The resultant force is zero.
2. The resultant force is greater than 30 N.
3. The resultant force is less than 30 N.
4. The resultant force is equal to 30 N.

13. Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the sum

1. is 12 m.
2. could be as small as 2.0 m, or as large as 12 m.
3. is 2.0 m.
4. is larger than 12 m.

14. Two vectors, of magnitudes 20 and 50, are added. Which one of the following is a possible answer for the magnitude of the resultant?

1. 80
2. 10
3. 40
4. 20

15. Which of the following is an accurate statement?

1. The magnitude of a vector can be less than the magnitude of one of its components.
2. The magnitude of a vector can be positive or negative.
3. A vector cannot have zero magnitude if one of its components is not zero.
4. If the magnitude of vector A is less than the magnitude of vector B, then the x-component of A is less than the x-component of B.

16. Which of the following operations will not change a vector?

1. Translate it parallel to itself.
2. Add a constant vector to it.
3. Multiply it by a constant factor.
4. Rotate it.

17. Which one of the following is an example of a vector quantity?

1. mass
2. distance
3. area
4. velocity

18. Which of the following relations is correct?

1. Speed = Distance x Time
2. Speed = Distance / Time
3. Speed = Time / Distance
4. Speed = 1 / Distance x Time

19. The basic unit of speed is:

1. km/min
2. m/min
3. km/h
4. m/s

20. A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

1. 100 km
2. 25 km
3. 15 km
4. 10 km