Raising the weight of the body on toes is an example for:
Class I lever
Class II lever
Class III lever
None of these
Which type of lever is this?
Class I
Class II
Class III
Nothing can said
Nodding action of head is an example of :
Class I lever is that in which
fulcrum is between the load and effort
load is between the fulcrum and effort
effort is between the load and fulcrum
fulcrum , load and effort are at one point
Which of the following statements is not true for a machine?
It always has efficiency less than 100 %.
Its mechanical advantage can be less than 1.
It can also be used as a speed multiplier.
It can have a mechanical advantage greater than the velocity ratio.
Efficiency is :
MA x VR
A machine is driven by a 100 kg mass that falls 8 m in 4 s.It lifts a load of mass 500 kg vertically upward. The force exerted by falling mass is:
600 N
100 N
1000 N
500 N
Seesaw is an example for:
Class I Lever
Class II Lever
Class III Lever
Class I & II Lever
For greater efficiency of a block and tackle pulley system,
the lower block should be of negligible weight
the upper and lower blocks should be of equal weight
the lower block should be heavier than the upper block
the weight of rope should be equal to the weight of pulleys
Class II levers are designed to have:
MA = VR
MA > VR
MA > 1
MA < 1
