GENERAL PHYSICS 2 (First Summative Test)
Quiz by Mark Paulo San Juan
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- Q1
Which of the following is the best statement of Pascal’s Law?
two electrons cannot occupy the same quantum state at the same time
pressure on a confined liquid is transmitted equally in all directions
a numerical arrangement where each number is the sum of the two numbers above
the volume of a gas is directly related to its temperature
60s - Q2
An ideal fluid flows through a long horizontal circular pipe. In one region of the pipe it has radius R. The pipe then widens to radius 2R.What is the ratio of the fluids speed in the region of radius R to the speed of the fluid in region with radius 2R?
1/2
1
4
1/4
60s - Q3
A fluid is forced through a pipe of changing cross section as shown. In which section would the pressure of the fluid be minimum?
IV
II
I
III
60s - Q4
A hydraulic press allows large masses to be lifted with small forces as a result of which principle?
Pascal's
Bernoulli's
Newton's
Archimedes'
60s - Q5
A 500N weight is on the small piston of a hydraulic machine. The small piston has an area of 2cm2. If the large piston has an area of 40cm2,how much weight can the large piston support?
25 N
500 N
10,000 N
40,000 N
300s - Q6
As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force on it?
it decreases
it increases
it remains constant
it may increase or decrease, depending on the shape of the rock
60s - Q7
50cm3 of wood is floating on water and 50 cm3 of iron is totally submerged. Which has the greater buoyant force on it?
the wood
both have the same buoyant force
the iron
cannot be determined without knowing their densities
60s - Q8
Saltwater is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the amount of water displaced in the salt water is
more
the same
cannot be determined from the given information
less
60s - Q9
Determine the mass of the air contained in a room whose dimensions are15 ft x 20 ft x 20 ft. Assume the density of the air is 0.0724 lb/ft3.
434.4 lbs
544.4 lbs
534.4 lbs
444.4 lbs
300s - Q10
The water flows in the channel 200 mm x 300 mm at the rate of 2 m/sec. What is the volume flow in ft3/sec?
4.24
1.24
2.24
3.24
300s - Q11
Two gaseous streams are mixed with one stream contains a diameter of 120 mm and specific gravity of 0.86 and speed of 5m/s and on the other stream is 150 mm and density of 890 kg/m3 at 2m/s. Find the mass flow rate at the exit if diameter of exit is 200 mm.
80 kg/s
65 kg/s
70 kg/s
75 kg/s
300s - Q12
Water flows in a pipe at the rate of 10 kg/s. If speed of flow is 10 m/s, find the pipe diameter.
38.39 mm
42.39 mm
30.23 mm
35.68 mm
300s - Q13
Oil flow through 16 tubes on a single tubes on a single cooler with a velocity of2m/s. The internal diameter of the tube is 30 mm and oil density is 0.85 g/ml. Find the volume flow in liters per sec.
62.22
32.22
42.62
22.62
300s - Q14
Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the water pressure greater?
the same point A and point B
cannot be determined from the given information
point A
point B
60s - Q15
A copper block is connected to a string and submerged in a container of water.
Position1: The copper is completely submerged, but just under the surface of the water.
Position2: The copper is completely submerged, mid-way between the water surface and the bottom of the container.
Position3: The copper is completely submerged, but just above the bottom surface of the container.
Assume that the water is incompressible. What is the ranking of the buoyant forces (B) acting on the copper blocks for these positions, from least to greater?
B1 < B2 < B3
B3 < B2 < B1
B1 = B2 = B3
B3 < B1 = B2
120s - Q16
What energy pertains to the energy that flows from one place to another because of a difference in
temperature?
Mechanical
Sound
Heat
Nuclear
60s - Q17
Mercury inside the thermometer shows thermal expansion (thermal meaning heat). True or false?
False, because heat doesn’t cause expansion.
False, because the molecules don’t have kinetic energy.
True, because when there is high temperature, the thermometer always explodes.
True, because the molecules of mercury expand with high temperature.
60s - Q18
It is the amount of heat needed by a material to increase its temperature by a degree.
heat capacity (c)
mass in kg (m)
heat energy (Q)
change in temperature
60s - Q19
What energy is evident in molecules along with high temperature or heat?
potential energy
sound energy
kinetic energy
chemical energy
60s - Q20
The molecules of ice are affected by high temperature. What happens to ice first?
remains solid ice
melts to liquid water
turns to water vapor
none
60s
