Nodding action of head is an example of :
Class I lever
Class II lever
Class III lever
None of these
A uniform seesaw 5 m long is supported at its centre. A boy weighing 40 kgf sits at a distance of 1 m from the centre of seesaw. To which class of lever does it belong?
Class I
Class II
Class III
Class I & II
Seesaw is an example for:
Class I Lever
Class II Lever
Class III Lever
Class I & II Lever
Raising the weight of the body on toes is an example for:
While ascending a hill, the driver keeps the gear ratio.
equal to 1
less than 1
greater than 1
either equal to 1 or greater than 1
Efficiency of an ideal machine is
50%
100%
90%
75%
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
Claw hammer is an example for:
Both Class I & II lever
The mechanical advantage of Class III lever is always:
1
A movable pulley is used as:
force multiplier
speed multiplier
device to change the direction of effort
all the above
