1. Work is a __________ ?
- Vector quantity
- Fundamental quantity
- Scalar quantity
- Both (A) and (B)
Answer: Option(C)
Memory: Work is a scalar quantity, because it has only magnitude but no direction.
Define work : Definition of Work : If a body gets displaced by applying an external force on it then, the scalar product of that force and displacement is called work.
2. SI unit of work is ?
- Newton
- Watt
- Joule
- Calorie
Answer: Option(C)
Memory: SI unit of work is joule.
3. If a body gets displaced by applying a force on it, then it is called ?
- Energy
- Power
- Displacement
- Work
Answer: Option(D)
Memory: If an object gets moved by applying an external force, then it is said to be work is done.
4. When force and displacement are in same direction, then work equals ?
- Zero
- Infinite
- W = FScos𝛉
- W = FS
Answer: Option(D)
Memory: When force and displacement are in same direction, then the angle between them is o degree, and the value of cosO is 1. Thus, W = FS.
5. In case of uniform circular motion, work done by the centripetal force is ?
- Infinite
- Zero
- One
- Can’t be determined
Answer: Option(B)
Memory: No memory is available.
6. If a body gets displaced by “S” when a force “F” acting on it, then work is ?
- W = FSsin𝛉
- W = FScos𝛉
- W = FStan𝛉
- W = FScot𝛉
Answer: Option(B)
Memory: The following is shown work formula :
7. Dimension of work is ?
- ML-2T2
- ML2T-2
- ML3T-2
- ML2T-3
Answer: Option(B)
Memory: As work equals, Force × Displacement, therefore,
