P.O.E. Unit 1 Test
Questions and Answers
- 1.
Which of the following forms of energy is not a fossil fuel?
- A.
Uranium
- B.
Natural Gas
- C.
Oil
- D.
Coal
Correct Answer
A. UraniumExplanation
Uranium is not a fossil fuel because it is not derived from the remains of ancient plants and animals. It is a radioactive metal that is found in the Earth's crust and is used as a fuel in nuclear power plants to produce electricity. Fossil fuels, on the other hand, such as natural gas, oil, and coal, are formed from the remains of plants and animals that lived millions of years ago and have undergone chemical and geological processes over time.Rate this question:
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- 2.
Select the INEXHAUSTABLE energy source.
- A.
Coal
- B.
Biomass
- C.
Uranium
- D.
Wind
Correct Answer
D. WindExplanation
Wind is the correct answer because it is an inexhaustible energy source. Unlike coal, biomass, and uranium, which are finite resources that will eventually run out, wind energy is renewable and will never be depleted. Wind power harnesses the natural movement of air to generate electricity, and as long as wind exists, this energy source can be continuously utilized without causing harm to the environment or depleting its supply.Rate this question:
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- 3.
Select the RENEWABLE energy source.
- A.
Coal
- B.
Natural Gas
- C.
Uranium
- D.
Biomass
Correct Answer
D. BiomassExplanation
Biomass is considered a renewable energy source because it is derived from organic materials such as plants, wood, and agricultural waste. These materials can be replenished through natural processes, making them sustainable in the long term. Biomass can be converted into various forms of energy, including heat, electricity, and biofuels, making it a versatile and environmentally friendly option.Rate this question:
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- 4.
A motor running a winch system can lift a 3-N load 6-m in 60 seconds while running at an average of 9-volts and drawing 500-mA. What is the efficiency of this system?
- A.
0.15 %
- B.
6.67 %
- C.
30.0 %
- D.
85.0 %
Correct Answer
B. 6.67 %Explanation
The efficiency of a system is calculated by dividing the useful output energy by the input energy. In this case, the useful output energy is the work done by the motor to lift the load, which is equal to the force applied (3 N) multiplied by the distance lifted (6 m). The input energy is the electrical energy supplied to the motor, which is equal to the voltage (9 V) multiplied by the current (500 mA) multiplied by the time (60 s). By calculating these values and dividing the output energy by the input energy, the efficiency of the system is found to be 6.67 %.Rate this question:
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- 5.
A lightbulb with 15 ohms of resistance is hooked up to a 1.5-v battery. The current running through the lightbulb will be ___.
- A.
0.10 amps
- B.
0.67 amps
- C.
10.0 amps
- D.
22.5 amps
Correct Answer
A. 0.10 ampsExplanation
The current running through the lightbulb can be calculated using Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is 1.5 V and the resistance is 15 ohms. Therefore, the current is 1.5 V / 15 ohms = 0.10 amps.Rate this question:
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- 6.
Two lamps are wired in parallel. If another lamp is added in parallel, ...
- A.
The voltage will drop.
- B.
The total current will stay the same.
- C.
The total resistance will increase.
- D.
The total resistance will decrease.
Correct Answer
D. The total resistance will decrease.Explanation
When lamps are wired in parallel, the total resistance decreases because the current has multiple paths to flow through. Adding another lamp in parallel will provide an additional path for the current, resulting in a decrease in the total resistance. This means that more current will flow through the circuit, causing the total current to stay the same. The voltage across each lamp will also remain the same, as the lamps are still connected in parallel.Rate this question:
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- 7.
TWO resistors with 15-ohms of resistance each are connected in series toa 1.5-v battery. The current running through the system will be ___.
- A.
0.50 amps
- B.
0.05 amps
- C.
1.0 amps
- D.
0.2 amps
- E.
None of the above
Correct Answer
B. 0.05 ampsExplanation
When resistors are connected in series, the total resistance is the sum of the individual resistances. In this case, the total resistance is 15 ohms + 15 ohms = 30 ohms. According to Ohm's Law, the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R), so I = V/R. Plugging in the values, we get I = 1.5 V / 30 ohms = 0.05 amps. Therefore, the correct answer is 0.05 amps.Rate this question:
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- 8.
In a series circuit, increasing the resistance while keeping voltage the same will cause the current to ___.
- A.
Stay the same
- B.
Increase
- C.
Decrease
- D.
Go to zero
Correct Answer
C. DecreaseExplanation
When the resistance in a series circuit is increased while keeping the voltage the same, the current will decrease. This is because according to Ohm's Law (V = IR), as resistance increases, the current flowing through the circuit decreases. Therefore, increasing the resistance will impede the flow of current, causing it to decrease.Rate this question:
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- 9.
A circuit has an applied voltage of 120 volts and a current of 250-mA. What is the resistance in the circuit?
- A.
30 Kilo-ohms
- B.
2.1 ohms
- C.
480 ohms
- D.
.48 ohms
Correct Answer
C. 480 ohmsExplanation
The resistance in a circuit can be calculated using Ohm's Law, which states that resistance is equal to voltage divided by current. In this case, the applied voltage is 120 volts and the current is 250 mA (or 0.25 A). By dividing 120 volts by 0.25 A, we get a resistance of 480 ohms.Rate this question:
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- 10.
In the circuit to the right, the current across R1 would be ___.
- A.
0.3 A
- B.
300 A
- C.
0.003 A
- D.
3.33 A
Correct Answer
C. 0.003 AExplanation
The current across R1 would be 0.003 A because according to Ohm's Law, the current flowing through a resistor is equal to the voltage across it divided by its resistance. Since the voltage across R1 is not given, we cannot determine the exact value of the current.Rate this question:
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- 11.
Determine the kinetic energy of a 755-kg roller coaster car that is moving with a speed of 17.6 m/s.
- A.
116,934 J
- B.
42.90 J
- C.
13,288 J
- D.
2757 J
Correct Answer
A. 116,934 JExplanation
The kinetic energy of an object is given by the equation KE = 1/2mv^2, where m is the mass of the object and v is its velocity. In this case, the mass of the roller coaster car is given as 755 kg and its velocity is 17.6 m/s. Plugging these values into the equation, we get KE = 1/2 * 755 kg * (17.6 m/s)^2 = 116,934 J. Therefore, the correct answer is 116,934 J.Rate this question:
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- 12.
Caleb does 2900 J of work in climbing a up a hill. If he does the work in 7 seconds, what is his power output?
- A.
414.3 watts
- B.
20300 watts
- C.
414.3 J
- D.
20300 J
Correct Answer
A. 414.3 wattsExplanation
Power is defined as the rate at which work is done or energy is transferred. It is calculated by dividing the work done by the time taken. In this case, Caleb does 2900 J of work in 7 seconds. Therefore, his power output can be calculated as 2900 J / 7 s = 414.3 watts.Rate this question:
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- 13.
A 2500 kg truck is traveling down the road at 20.1 m/s. If the truck accelerates to 29.9 m/s over a distance of 200 m, how much power is exerted by the car?
- A.
76,562.5 watts
- B.
51,020 watts
- C.
373.35 watts
- D.
5760 watts
Correct Answer
A. 76,562.5 wattsExplanation
The power exerted by the truck can be calculated using the equation P = F * v, where P is power, F is force, and v is velocity. To find the force, we can use the equation F = m * a, where m is mass and a is acceleration. The acceleration can be calculated using the equation a = (vf^2 - vi^2) / (2 * d), where vf is final velocity, vi is initial velocity, and d is distance. Plugging in the given values, we can calculate the force and then substitute it into the power equation to find the power exerted by the truck. The correct answer is 76,562.5 watts.Rate this question:
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- 14.
How much energy is used by a 60 watt lightbulb in 3 hours?
- A.
648,000 J
- B.
180 J
- C.
10,800 J
- D.
20 J
Correct Answer
A. 648,000 JExplanation
A 60 watt lightbulb uses 60 joules of energy every second. In 3 hours, there are 60 seconds in a minute, 60 minutes in an hour, and 3 hours, so the total number of seconds is 60 x 60 x 3 = 10,800 seconds. Therefore, the total energy used by the lightbulb in 3 hours is 60 x 10,800 = 648,000 joules.Rate this question:
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- 15.
A horse performs 12000 joules of work pulling a wagon for 27 seconds. What is the horse's power?
- A.
444.44 watts
- B.
324000 watts
- C.
11973 watts
- D.
12027 watts
Correct Answer
A. 444.44 wattsExplanation
Power is defined as the rate at which work is done or energy is transferred. It is calculated by dividing the amount of work done by the time it takes to do it. In this case, the horse performs 12000 joules of work in 27 seconds. To find the power, we divide 12000 joules by 27 seconds, which gives us approximately 444.44 watts.Rate this question:
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- 16.
Which process powers nuclear submarines?
- A.
Nuclear fission
- B.
Nuclear fusion
- C.
Geothermal inversion
- D.
Cosmic implosion
Correct Answer
A. Nuclear fissionExplanation
Nuclear fission is the correct answer because it is the process that powers nuclear submarines. Nuclear fission involves the splitting of atomic nuclei, releasing a large amount of energy. This energy is harnessed in nuclear reactors on submarines to generate power and propel the submarine. Nuclear fusion, geothermal inversion, and cosmic implosion are not processes used to power nuclear submarines.Rate this question:
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- 17.
A net force of 18 N is exerted on an encyclopedia to cause it to accelerate at a rate of 4 m/s2. Determine the mass of the encyclopedia.
- A.
4.5 kg
- B.
72 kg
- C.
4.5 lbs
- D.
.222 lbs
Correct Answer
A. 4.5 kgExplanation
The mass of an object can be determined by dividing the net force acting on it by its acceleration, using the formula F = ma. In this case, the net force is given as 18 N and the acceleration is given as 4 m/s^2. By rearranging the formula, we can solve for mass: m = F/a. Plugging in the values, we get m = 18 N / 4 m/s^2 = 4.5 kg.Rate this question:
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- 18.
Which process powers the sun?
- A.
Nuclear fission
- B.
Nuclear fusion
- C.
Geothermal inversion
- D.
Cosmic implosion
Correct Answer
B. Nuclear fusionExplanation
The process that powers the sun is nuclear fusion. Nuclear fusion is the process in which two or more atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy in the process. In the sun, hydrogen nuclei combine to form helium, releasing a tremendous amount of energy in the form of light and heat. This process is what sustains the sun's energy output and allows it to shine.Rate this question:
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- 19.
On the paper test, what is your answer for number 1A?
- A.
Third class lever
- B.
First class lever
- C.
Second class lever
- D.
Block and tackle
Correct Answer
A. Third class leverExplanation
A third-class lever is the correct answer because it is a type of lever where the effort is applied between the fulcrum and the load. In a third-class lever, the load is closer to the fulcrum than the effort, which means that the effort arm is longer than the load arm. This type of lever provides mechanical advantage, allowing a smaller effort to move a larger load, but at the expense of increased effort distance.Rate this question:
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- 20.
On the paper test, what is your answer for number 1C?
- A.
Third class lever
- B.
First class lever
- C.
Second class lever
- D.
Block and tackle
Correct Answer
C. Second class leverExplanation
A second class lever is the correct answer because in this type of lever, the load is located between the fulcrum and the effort. This means that the effort arm is always longer than the load arm, resulting in a mechanical advantage. In a second class lever, the load is moved in the same direction as the effort, which makes it easier to lift heavy objects. Examples of second class levers include a wheelbarrow and a nutcracker.Rate this question:
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- 21.
On the paper test, what is your answer for number 1B?
- A.
Third class lever
- B.
First class lever
- C.
Second class lever
- D.
Block and tackle
Correct Answer
B. First class leverExplanation
A first class lever is the correct answer because it is a type of lever where the fulcrum is located between the effort and the load. In this type of lever, the effort is applied on one side of the fulcrum and the load is on the other side, with the fulcrum acting as the pivot point. This lever allows for a variety of movements and can be used to increase force or speed depending on the placement of the effort and load.Rate this question:
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- 22.
On the paper test, what is your answer for number 2?
- A.
0.7
- B.
1.43
- C.
0.4
- D.
1.75
Correct Answer
A. 0.7Explanation
The correct answer to number 2 on the paper test is 0.7.Rate this question:
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- 23.
On the paper test, what is your answer for number 3?
- A.
83%
- B.
120%
- C.
17%
- D.
0.075 %
Correct Answer
A. 83%Explanation
The answer is 83% because it is the only option that is a percentage. The other options, 120%, 17%, and 0.075%, are not valid percentages.Rate this question:
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- 24.
On the paper test, what is your answer for number 4?
- A.
6
- B.
60
- C.
.85
- D.
5.1
Correct Answer
A. 6Explanation
The question asks for the answer to number 4 on the paper test. Among the given options, the only whole number is 6. Therefore, the correct answer is 6.Rate this question:
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- 25.
On the paper test, what is your answer for number 5?
- A.
6
- B.
60
- C.
.85
- D.
5.1
Correct Answer
D. 5.1 -
- 26.
On the paper test, what is your answer for number 6?
- A.
62.7 lbs
- B.
60.0 lbs
- C.
53.3 lbs
- D.
5.1 lbs
Correct Answer
A. 62.7 lbs -
- 27.
On the paper test, what is your answer for number 7?
- A.
3
- B.
1/3
- C.
6
- D.
30
Correct Answer
A. 3Explanation
The given answer is 3 because it is the only whole number among the options provided. The other options are fractions or larger numbers.Rate this question:
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- 28.
On the paper test, what is your answer for number 8?
- A.
Gear B multiplies the gear ratio by 10
- B.
Gear B changes the direction of Gear C
- C.
Gear B reduces the gear ratio of the system
- D.
Gear B causes Gear C to become the driver gear
Correct Answer
B. Gear B changes the direction of Gear CExplanation
Gear B changes the direction of Gear C. This means that when Gear B rotates in one direction, Gear C will rotate in the opposite direction. This is a common function of gears in a system, where one gear is used to reverse the direction of rotation of another gear.Rate this question:
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- 29.
In the morning, a concrete statue (specific heat = 600 J/(kg K)) has a temperature of 19°C. During the day, it sits in the sun and warms up to 40°C, gaining 90,000 J of thermal energy. What is its mass?
- A.
7.14 kg
- B.
6 Kg
- C.
3150 kg
- D.
14.28 Kg
Correct Answer
A. 7.14 kgExplanation
The specific heat of a substance is defined as the amount of thermal energy required to raise the temperature of one kilogram of the substance by one degree Celsius. In this case, the concrete statue gained 90,000 J of thermal energy as it warmed up from 19°C to 40°C. To find the mass of the statue, we can use the formula:
Thermal energy = mass * specific heat * temperature change
Rearranging the formula, we have:
mass = thermal energy / (specific heat * temperature change)
Plugging in the given values, we get:
mass = 90,000 J / (600 J/(kg K) * (40°C - 19°C))
mass = 90,000 J / (600 J/(kg K) * 21 K)
mass = 7.14 kg
Therefore, the mass of the concrete statue is 7.14 kg.Rate this question:
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- 30.
How much energy is needed to heat 5 kg of sand, which has a specific heat of 664 J/(kg K) from 25°C to 50°C?
- A.
8300 J
- B.
83000 J
- C.
13280 J
- D.
15000 J
Correct Answer
B. 83000 JExplanation
The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1 kg of that substance by 1 degree Celsius. In this question, we are given that the specific heat of sand is 664 J/(kg K). We are also given the mass of the sand (5 kg) and the change in temperature (25°C to 50°C). To calculate the energy needed, we use the formula: Energy = mass x specific heat x change in temperature. Plugging in the values, we get: Energy = 5 kg x 664 J/(kg K) x 25 K = 83000 J. Therefore, the correct answer is 83000 J.Rate this question:
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.png "In the circuit to the right, the current across R1 would be ___.")
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