Georgia Science Grade 8

Chapter 12: Forces and Fluids

CRCT Practice

1
A force of 15 N is exerted over an area of 0.1 m2. What is the pressure on the area?
A)150 kPa
B)150 Pa
C)1.5 kPa
D)1.5 Pa
2
Which increases the pressure exerted by the nail tip on the board?

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A)increasing the area of the nail tip
B)decreasing the area of the nail tip
C)increasing the length of the nail
D)decreasing the length of the nail
3
Which instrument is used to measure atmospheric pressure?
A)altimeter
B)hygrometer
C)barometer
D)odometer
4
If the boat and the cube have the same mass, which of these is true?

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A)The boat displaces less water than the cube.
B)The boat displaces the same amount of water as the cube.
C)The boat is less dense than the cube.
D)The densities of the boat and the cube are equal.
5
Which would make the cube more likely to float?

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A)increasing its volume
B)decreasing its volume
C)increasing its weight
D)decreasing its weight
6
A 15-g block of aluminum has a volume of 5.5 cm3.What is its density?
A)2.7 g/cm3
B)15.5 g/cm3
C)0.37 g/cm3
D)9.5 g/cm6
7
The pressure inside the fluid of a hydraulic system is increased by 1,000 Pa. What is the increase in the force exerted on a piston that has an area of 0.05 m2?
A)20,000 N
B)1,000 N
C)50 N
D)0.5 N
8
Which is true about a floating object?
A)Weight is greater than buoyant force.
B)Weight is less than buoyant force.
C)Buoyant force equals weight.
D)Buoyant force equals mass.
9
Suppose the boat’s load increases so it floats lower in the water. Which is true?

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A)The buoyant force on the boat decreases.
B)The buoyant force on the boat increases.
C)The density of the boat decreases.
D)The density of the boat does not change.
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