Page 407 - GMAT 2017b_Neatb

Mechanical Comprehension Test 2

135.A solid object will float on water when
(A) it is less dense than water. 300 pounds 18 feet
(B) it is more dense than water.
(C) it has a large surface area.
(D) it has a small surface area. 6 feet
136. A nut travels 1.25 inches after 15 turns of the screw.
How many threads per inch does the screw have?
(A) 10
(B) 12
(C) 15
(D) 20
140. A 300-pound barrel is being supported on an incline.
The incline is 18 feet long and rises 6 feet. How much
force is necessary to prevent the barrel from rolling
down?
(A) 50 pounds
(B) 100 pounds
(C) 150 pounds
(D) 300 pounds

141. A single-speed bicycle has a front chain ring with 55
teeth. The back gear gas 11 teeth. If the bicycle is
pedaled for 80 rpm, how many complete revolutions
will the rear wheel make in 30 seconds?
(A) 40 revolutions
(B) 80 revolutions
(C) 200 revolutions
(D) 400 revolutions
137. Using the pulley system shown above. How much force
is required to lift a 200-pound load? 142. Why do helium-filled balloons float?
(A) 50 pounds (A) Helium is less dense than air.
(B) 100 pounds (B) Helium is a noble gas.
(C) 200 pounds (C) Helium is hotter than air.
(D) 400 pounds
(D) Helium is colder than air.
138. Which material expands most when heated?
(A) wood
(B) steel
(C) glass
(D) rubber

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143. The pulley system shown in the figure offers what
advantage?
(A) a two-fold mechanical advantage
(B) a three-fold mechanical advantage
(C) a change in the direction of force
(D) no advantage
139. Gear 1 has 12 teeth and gear 2 has 9. If the gear 1 turns at
30 rpm, hoe fast will gear 2 turn?
(A) 20 rpm (B) 30 rpm
(C) 40 rpm (D) 60 rpm
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