ICSE Machines 2 Grade 10

Class III levers are designed to have

• MA=VR

• MA>VR

• MA>1

• MA<1

For practical machines

• MA>VR

• MA<VR

• MA=VR

• MA =100%

The loss of energy in a machine is due to

• Different parts are not rigid

• Moving parts are not frictionless

• String is not elastic

• All of the above

Which term does not change for a machine of given design

• MA

• Efficiency

• VR

• All of above

The correct relationship between MA, VR, and efficiency is :

• MA = Efficiency x VR

• VR = MA X Efficiency

• Efficiency = MA x VR

• Efficiency = MA + VR

A single fixed pulley is used as :

• a force multiplier

• a speed multiplier

• a device to change the direction of force

• an energy multiplier

For a single movable pulley relation between load(L) and effort(E) is :

• E = L

• E = L/2

• L = E/2

• E = L²

A class I lever has :

• E in between F and L

• F in between E and L

• L in between F and L

• None of the above

If a lever has effort arm of 2 cm and load arm of 10 cm then in case of ideal machine MA is equal to:

• 5

• 20

• 1

• 0.2

Raising of weight of body on toes is an example of :

• Class I Lever

• Class II Lever

• Class III Lever

• None of the above