Simple Machines and Levers
1. What is the ratio between the distances moved by the effort to the distance moved by the load?
A : Mechanical advantage
B : Velocity ratio
C : Efficiency
D : Fulcrum
2. What is the mechanical advantage, if a load of 1000 kg is lifted by a simple machine and effort applied is 250 kg?
A : 6
B : 8
C : 3
D : 4
3. What is the velocity ratio of a wheel and axle if the radii of wheel and axle are 375 mm and 75 mm respectively?
A : 3
B : 4
C : 5
D : 6
4. What is the velocity ratio of a simple machine of a mass 120 kg is lifted to a height of 5 meters by a force of 60 kg moving 15 metre. Calculate velocity ratio?
A : 1
B : 2
C : 3
D : 4
5. What is the efficiency of a simple screw jack having velocity ratio is 314.2 and mechanical advantage is 220?
A : 0.6
B : 0.65
C : 0.7
D : 0.75
6. How much load is lifted if an effort of 25 kg is applied to a simple machine having velocity ratio of 4 and efficiency 75%?
A : 65 kg
B : 70 kg
C : 75 kg
D : 80 kg
7. What is the name of fixed or supporting point of a lever?
A : Mechanical advantage
B : Fulcrum
C : Effort
D : Load
8. What effort required to lift a load of 150 kg in a wheel and axle, if the velocity ratio is 2.5 and the efficiency of the machine is 75%?
A : 70 kg
B : 80 kg
C : 90 kg
D : 100 kg
9. What is the distance of the load from the fulcrum called?
A : Effort arm
B : Load arm
C : Power arm
D : Effort
10. Which is example for first order lever?
A : A wheel barrow
B : A pair of scissors
C : Fire tongs
D : Lime squeezer
11. Which is example for second order lever?
A : Common balance
B : A pair of scissors
C : Bottle opener
D : Human forearm
12. Which is example for third order lever?
A : Common balance
B : Forceps
C : A pair of scissors
D : Lime squeezer
13. Which type of levers is bell cranked lever?
A : Curved lever
B : 1st order lever
C : 2nd order lever
D : 3rd order lever
14. Which order lever is claw hammer?
B : 2nd order lever
C : 3rd order lever
D : Curved lever
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