Physics
Which of the following statements is incorrect?
- The velocity ratio of a single fixed pulley is always 1.
- The velocity ratio of a single movable pulley is always 2.
- The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2n.
- The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting load.
Answer
All the given options are correct.
Reason — The velocity ratio of a single fixed pulley is always 1 and that of a single movable pulley is always 2.
The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2n whereas the velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting load.
Related Questions
The figure given below shows a fixed pulley used by a boy to lift a load of 200 N through a vertical height of 5 m in 10 s. The velocity ratio of the pulley is
- 0
- 1
- 2
- none
The mechanical advantage of an ideal single movable pulley is:
- 1
- 2
- less than 2
- less than 1.
If there are n movable pulleys with one fixed pulley, the mechanical advantage is given by :
- 2n
- 2n+1
- 2n-1
- 2n+2
Which of the following differences between a single fixed pulley and a single movable pulley is incorrect?
Single fixed pulley Single movable pulley (1) It is fixed to a rigid support (i) It is not fixed to a rigid support. (2) The load moves in a direction opposite to the effort. (ii) The load moves in the direction of effort. (3) Its ideal mechanical advantage is 1. (iii) Its ideal mechanical advantage is 1. (4) Its ideal velocity ratio is 2. (iv) Its ideal velocity ratio is 1. (5) The axis of rotation does not move in space. (v) The axis of rotation also moves. - (5)
- (2) and (5)
- (3) and (5)
- (3) and (4)