17. Which of the following shows innovation in the use of pulleys as a simple machine? *
A. Raising a flag in a flagpole
B.Lifting a pale of mixed cement in 3 story houses
C. Drying clothes in a rope with pulleys on each end
D. Used in a crane machine for construction of building.

18. Justine was asked to make coffee by her mother. He went to the kitchen and made some by getting coffee, sugar, and coffee creamer from each canister. While opening the canister, he accidentally dropped it and broke into pieces because it was made of glass. Which of the following is the most accurate reason while he dropped the canister? *
A. It was not fastened enough.
B. The canisters have broken grooves.
C. The canisters cover was interchanged by the previous user.
D. He was not holding it properly causing him to drop it because the cover was not fastened enough.

19.Which of the following statements best describes the function of a wheel and axle? *
A. It is used to raise weighs.
B. It is used for raising weights or water buckets from wells.
C. It is made up of a circular frame that revolves on a shaft or rod.
D. It refers to the assembly formed by two discs of different diameter mounted so that they rotate together around the same axis.

20.Which of the following best describes a pulley as simple machine? *
A. It is a simple machine that is used in flagpoles.
B. It is a simple machine used for lifting heavy objects in constructions.
C. It is a wheel that carries a flexible rope, cord, cable, chain, or belt on its rim.
D. It is a wheel with a groove along its edge, for holding a rope or cable, usually used in sets designed to reduce the amount of force needed to lift a load.​