exam

1. Panabo SDA Learning Center, Inc.
Purok 18, New Visayas, Panabo City
Third Prelim
Science 4 (PHYSICS)
Name:_________________________________________ Date:____________
GENERAL INSTRUCTION: Read and follow specific instructions. Analyze carefully each item and give the best answer.
No scratch papers! Avoid ERASURES.
Test I.A – Multiple Choice
Direction: Read and understand each statement. Shade the best letter of your choice.
a b c d
O O O O 1. A metal block has a density of 7000 kilogram per cubic meter and a mass of 17000 kilogram. What is its
volume?
a. 2.43 cm3 b. 24.3 cm3 c. 2.43 m3 d. 24.3 m3
O O O O 2. The degree of compactness of a substance and is measured by the quantity of mass per unit volume.
a. Area b. Buoyancy c. Pressure d. Density
O O O O 3. A dam is thicker at the bottom than at the top because _______.
a. water is denser at deeper levels c. it looks better
b.surface tension exists only on the surface liquidsd. water pressure is greater with increasing depth
O O O O 4. What would be the density of a water if its mass is 7.8 kg and its volume is 5.7 cubic centimeter?
a. 1.37 kg/m3 b. 1.37 g/cm3 c. 13.7 kg/mL d. 1.37 kg/cm3
O O O O 5. What is the proper way to get the mass of a liquid displaced in a beaker?
a. pour the liquid in a weighing scale
b. transfer the liquid to another beaker with the same capacity and then weigh, subtract the value of the
beaker FROM the value of its volume.
c. just weigh the beaker and record its mass
d. weigh the beaker without water first and then weigh it again with a water on it, subtract the value of the
beaker without water FROM the value of the beaker with water.
O O O O 6. If the mass of an object remains the same but its volume is doubled, then its density will
a. double b. be reduced to quarter c. be reduced to half d. not change
O O O O 7. A rock and a balloon each has a volume of 1 m3. How do the buoyant forces acting on them due to the air compare?
a. The buoyant force on the rock is greater than that on the balloon.
b. The buoyant force on the rock is less than that on the balloon.
c. The buoyant forces on the rock and on the balloon are equal.
d. There is no buoyant force on the rock.
O O O O 8. The reason that buoyant force acts upward on a submerged object is that _____.
a. it is acted downward, nothing would float
b. the weight of fluid displaced reacts with an upward force
c. it acts in a direction to oppose gravity
d. upward pressure against the bottom is greater than downward pressure against the top of the submerged object
O O O O 9. The pressure at the bottom of a jug filled with water does NOT depend on ____.
a. surface area of the water
b. water density
c. the height of the liquid
d. the acceleration due to gravity
O O O O 10. Which of the following is NOT considered as a unit for Pressure?
a. Pa b. psi c. N/m3 d. kPa
O O O O 11. The density of water in a river 7m deep is about 1070kg/m3. What is the water pressure at the bottom?
a. 73402 N/m3 b. 74302 Pa c. 73402 N/m2 d. 743.02 Pa
For questions 12-15, refer to the following situation. A cylinder contains 30 mL of water. A
stone is dropped into the water and sinks. The water level rises to 50mL. The density of
water is 1.0x10-3
kg/mL.
O O O O 12. Which statement is false?
a. The stone displaces water c. There is no buoyant force on the stone
b. The volume of the stone is 20mL d. The mass of the displaced water is 20 g.
O O O O 13. What is the density of the stone if its mass is 3.7 g?
a. 0.185 kg/L b. 0.074 g/mL c. 0.185 g/cm3 d. 0.074 kg/mL
O O O O 14. What is the volume of water?
a. 50 mL b. 30 L c. 20 mL d. 30 cc
O O O O 15. What would be the pressure exerted by the stone on the water as it settles at the bottom if the height of the
water being displaced is 5.7 cm?
a. 0.103 kPa b. 0.103 N/m3 c. 0.103 psi d. 0.103 Pa
SCORE:
Knowledge:_____
Process :_____
Understanding:_____

2. Test II. Problem Solving
Direction: Analyze each question and answer/solve each correctly. Always show your solution.
1. A brim was filled with water containing 17 gallons (77.28 L|) of water in 4 m height. You happened to submerge
yourself as you take your bath, how much pressure did you put on the water on the brim if your mass is 38 kg and the
volume of water that spilled was 17 L?
2. The same situation with number one, solve for your density.
3. How much force is needed on a small piston with an area of 7 centimeter square to support 1700N weight resting on a
piston of area 27 cm2? (Hint: find F1)
Test III. Essay
Direction: Answer all the given questions comprehensively. Don’t skip these items. Observe formality.
1. Explain the principle behind the application of pressure in hydraulic machines and pneumatic machines.
2. Explain the principle behind the application of pressure in pressure cookers.
3. What causes pressure in your life? Give two examples and explain how you overcome such pressure.
“He that getteth wisdom loveth his own soul: he that keepeth understanding shall find good.” --Proverbs 19:8
God Bless! . .
Prepared by:
Sarah Jane C. Lambonao
Science 4 Teacher