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## Workshop Calculation and Science

#### Year 1 Module 9

1: What is the ratio between the distance moved by the effort to the distance moved by the load

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 metres by a force of 60 kg moving 15 meter. 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

B : Fulcrum
C : Effort

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

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

A : 1st order lever  1st
B : 2nd order lever  2nd
C : 3rd order lever  3rd
D : Curved lever

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