Physical Science Benchmark #1 Review
Questions and Answers
- 1.
If an object has kinetic energy, then it also must have _____.
- A.
Speed
- B.
Impulse
- C.
Acceleration
- D.
Force
Correct Answer
A. SpeedExplanation
If an object has kinetic energy, it means that it is in motion. Speed is a measure of how fast an object is moving, so if an object has kinetic energy, it must also have speed.Rate this question:
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- 2.
An object that has kinetic energy must be _____.
- A.
Moving.
- B.
Falling.
- C.
At an elevated position.
- D.
At rest.
Correct Answer
A. Moving.Explanation
An object that has kinetic energy must be moving because kinetic energy is the energy possessed by an object due to its motion. If an object is not moving, it does not have any kinetic energy. Therefore, the correct answer is moving.Rate this question:
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- 3.
The formula to calculate work is W= F x d How much work was done is 5 N of force was used to move an object 25 meters?
- A.
30 Joules
- B.
125 Joules
- C.
5 Joules
- D.
20 Joules
Correct Answer
B. 125 JoulesExplanation
The formula to calculate work is W = F x d. In this question, the force used is 5 N and the distance moved is 25 meters. By substituting these values into the formula, we get W = 5 N x 25 m = 125 Joules. Therefore, the correct answer is 125 Joules.Rate this question:
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- 4.
The formula for calculating work = W= F x d A vehicle at the wrecking yard was pushed forward 7 meters with a force of 5000 N. How much work was done?
- A.
5007 J
- B.
4993 J
- C.
35000 J
- D.
714.2 J
Correct Answer
C. 35000 JExplanation
The formula for calculating work is W = F x d, where W is the work done, F is the force applied, and d is the distance over which the force is applied. In this case, the force applied is 5000 N and the distance over which it is applied is 7 meters. Therefore, the work done can be calculated as W = 5000 N x 7 m = 35000 J.Rate this question:
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- 5.
The formula for calculating work is F x d A family car ran out of gas in the left lane of a busy street. The father got out of the car and tried to push the car to the gas station. He used about 600 N of force, but the car moved a distance of 0. How much work was done?
- A.
600 J
- B.
1200 J
- C.
300 J
- D.
0 J
Correct Answer
D. 0 JExplanation
Work is calculated by multiplying the force applied by the distance moved in the direction of the force. In this scenario, the father applied a force of 600 N, but the car did not move any distance. Since the distance moved is 0, the work done is also 0.Rate this question:
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- 6.
According to the definition for work, in order for work to be accomplished their must be a force exerted on an object and
- A.
The object must move in the opposite direction of the applied force
- B.
The object must move in the same direction as the applied force
- C.
The object must be lifted up
- D.
The object must move a distance less than 100 meters
Correct Answer
B. The object must move in the same direction as the applied forceExplanation
According to the definition of work, work is accomplished when a force is exerted on an object and the object moves in the same direction as the applied force. This means that the force and displacement must be in the same direction for work to be done. If the object moves in the opposite direction of the applied force, no work is being done as the force and displacement are in opposite directions. Lifting the object up or moving a distance less than 100 meters are not necessary conditions for work to be accomplished, as long as the force and displacement are in the same direction.Rate this question:
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- 7.
The formula for calculating work is W= F x d A pulley is used to lift a heavy piano 6 meters up to the second floor. The amount of force applied upward is 700 N. How much work was done?
- A.
706 J
- B.
4200 J
- C.
116.6 J
- D.
694 J
Correct Answer
B. 4200 JExplanation
The formula for calculating work is W = F x d, where W represents work, F represents force, and d represents distance. In this scenario, the force applied upward is 700 N and the distance the piano is lifted is 6 meters. Therefore, to calculate the work done, we multiply the force by the distance: W = 700 N x 6 m = 4200 J.Rate this question:
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- 8.
The formula for calculating work is W= F x d Jerry pulled the library cart 3 meters with a force of 17 N. How much work was done?
- A.
51 J
- B.
20 J
- C.
14 J
- D.
5.6 J
Correct Answer
A. 51 JExplanation
Jerry pulled the library cart 3 meters with a force of 17 N. To calculate the work done, we use the formula W = F x d, where W is the work done, F is the force applied, and d is the distance moved. Plugging in the values, we get W = 17 N x 3 m = 51 J. Therefore, the work done is 51 J.Rate this question:
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- 9.
The formula for calculating work is W= F x d. A body builder lifts the barbell up 1 meter with a force of 501 N. Then He uses 501 N to hold the barbell in place for 2 minutes. How much work was done?
- A.
1002 J
- B.
501 J
- C.
500 J
- D.
250. 5 J
Correct Answer
B. 501 JExplanation
The work done can be calculated by multiplying the force applied by the distance moved. In the first part, the body builder lifts the barbell up 1 meter with a force of 501 N, so the work done is 501 J. In the second part, the body builder uses the same force of 501 N to hold the barbell in place for 2 minutes. However, since there is no distance moved, no work is done in this case. Therefore, the total work done is 501 J.Rate this question:
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- 10.
The ability to do work or cause change is...
- A.
Work
- B.
Gravity
- C.
Energy
Correct Answer
C. EnergyExplanation
Energy is the correct answer because it is the capacity or ability to do work or cause change. Energy can exist in various forms such as kinetic energy, potential energy, thermal energy, etc. It is essential for any type of work or change to occur, making it a fundamental concept in physics.Rate this question:
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- 11.
The energy an object has while in motion is...
- A.
Elastic potential energy
- B.
Gravitational potential energy
- C.
Kinetic energy
Correct Answer
C. Kinetic energyExplanation
Kinetic energy is the energy possessed by an object due to its motion. It depends on the mass and velocity of the object. When an object is in motion, it has the ability to do work and transfer energy. Therefore, kinetic energy is the correct answer as it describes the energy an object has while in motion.Rate this question:
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- 12.
Stored energy that results from the position or shape of an object is called...
- A.
Potential energy
- B.
Kinetic energy
- C.
Thermal energy
Correct Answer
A. Potential energyExplanation
Potential energy is the correct answer because it refers to the stored energy that an object possesses due to its position or shape. This energy has the potential to be converted into other forms of energy, such as kinetic energy, when the object is in motion. Thermal energy refers to the energy associated with the temperature of an object, while kinetic energy is the energy of an object in motion.Rate this question:
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- 13.
Calculate the momentum of a 700g ball that is rolling down a ramp at 4.6m/s.
- A.
3.22 kg x m/s
- B.
3,220 kg x m/s
- C.
152.17 kg x m/s
- D.
6.57 kg x m/s
Correct Answer
A. 3.22 kg x m/sExplanation
The momentum of an object is calculated by multiplying its mass by its velocity. In this case, the mass of the ball is given as 700g, which is equivalent to 0.7kg. The velocity of the ball is given as 4.6m/s. Multiplying these values together gives a momentum of 3.22 kg x m/s.Rate this question:
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- 14.
If a force of 50N acts on a 5 kg object, its acceleration is equal to ______ meters per second squared.
- A.
55
- B.
45
- C.
250
- D.
10
Correct Answer
D. 10Explanation
The acceleration of an object can be calculated using the formula a = F/m, where F is the force applied to the object and m is its mass. In this question, the force applied is 50N and the mass of the object is 5 kg. Plugging these values into the formula, we get a = 50N / 5 kg = 10 m/s^2. Therefore, the correct answer is 10.Rate this question:
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- 15.
The resistance an object has to a change in its motion is called ______________,
- A.
Equilbrium
- B.
Inertia
- C.
Momentum
- D.
Drag
Correct Answer
B. InertiaExplanation
Inertia is the resistance an object has to a change in its motion. It is a property of matter that causes objects to continue moving in a straight line at a constant speed or to stay at rest unless acted upon by an external force. Inertia can be thought of as the tendency of an object to resist changes in its state of motion.Rate this question:
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- 16.
3. If a total distance of 750 m is covered in a time interval of 25 s,the average speed is ______?
- A.
3,974 mph
- B.
3 mph
- C.
30 mph
- D.
30 m/s
Correct Answer
D. 30 m/sExplanation
The average speed can be calculated by dividing the total distance covered by the time taken. In this case, the total distance covered is 750 m and the time interval is 25 s. Dividing 750 m by 25 s gives us an average speed of 30 m/s.Rate this question:
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- 17.
6. If a person walked at 2 m/s for 12 s he/she would travel a distance of ________.
- A.
24 m
- B.
6 m
- C.
4 m
- D.
None of the answers
Correct Answer
A. 24 mExplanation
If a person walks at a speed of 2 m/s for 12 seconds, we can calculate the distance traveled by multiplying the speed by the time. Therefore, 2 m/s * 12 s = 24 m.Rate this question:
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- 18.
7. How long would it take to travel 50 km traveling at a speed of 10 km/hr?
- A.
3 hours
- B.
1 hour
- C.
5 hours
- D.
50 hours
Correct Answer
C. 5 hoursExplanation
At a speed of 10 km/hr, it would take 5 hours to travel 50 km. This can be calculated by dividing the distance (50 km) by the speed (10 km/hr), which gives us 5 hours.Rate this question:
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- 19.
The current in a circuit equals the voltage difference divided by the resistance.
- A.
Law of resistance
- B.
Law of compliance
- C.
Ohms Law
- D.
Conductivity Law
- E.
Static electricity
Correct Answer
C. Ohms LawExplanation
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage difference across it and inversely proportional to its resistance. In other words, the current in a circuit can be calculated by dividing the voltage difference by the resistance. This relationship is fundamental in understanding and analyzing electrical circuits, and it is named after the German physicist Georg Simon Ohm, who first formulated it. Therefore, Ohm's Law is the correct answer in this case.Rate this question:
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- 20.
The net movement of electric charges in a singe direction.
- A.
Voltage difference
- B.
Electric current
- C.
Electric circuits
- D.
Batteries
Correct Answer
B. Electric currentExplanation
Electric current refers to the flow of electric charges in a single direction. It is the movement of electrons through a conductor, such as a wire. This flow of charges is caused by a voltage difference, which creates an electric field that pushes the charges along. Electric circuits, which consist of interconnected components, provide a path for the current to flow. Batteries, as a source of electrical energy, create the voltage difference needed to establish and maintain the electric current in a circuit.Rate this question:
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- 21.
A ____ ____ is related to the force that causes electric charges to flow.
- A.
Electric currents
- B.
Voltage difference
- C.
Dry cell batteries
- D.
Current flow
Correct Answer
B. Voltage differenceExplanation
A voltage difference is related to the force that causes electric charges to flow. Voltage difference refers to the potential energy difference between two points in an electric circuit, which creates an electric field that pushes the charges to move. This potential difference is what drives the flow of electric current through a conductor, as charges move from an area of higher voltage to an area of lower voltage. Therefore, the correct answer is "Voltage difference."Rate this question:
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- 22.
Voltage difference is measured in _____.
- A.
Amps
- B.
Electrodes
- C.
Volts
- D.
Centimeters
Correct Answer
C. VoltsExplanation
Voltage difference is measured in volts. Volts is the unit of measurement for voltage, which represents the amount of electric potential difference between two points in an electrical circuit. Amps, electrodes, and centimeters are not appropriate units for measuring voltage difference. Amps measure electric current, electrodes are used in electrical systems, and centimeters measure length or distance.Rate this question:
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- 23.
What is the unit for voltage?
- A.
Volts
- B.
Amperes
- C.
Ohms
- D.
Joules
Correct Answer
A. VoltsExplanation
The unit for voltage is volts. Voltage is a measure of the electric potential difference between two points in a circuit. It represents the amount of energy per unit charge that is transferred from one point to another. The volt is named after the Italian physicist Alessandro Volta, who invented the electric battery. It is commonly used in electrical engineering and physics to quantify the strength of an electric field or the potential difference across a circuit component.Rate this question:
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- 24.
What is the unit for current?
- A.
Volts
- B.
Amperes
- C.
Ohms
- D.
Joules
Correct Answer
B. AmperesExplanation
The unit for current is amperes. Amperes is the SI unit for measuring electric current, which is the flow of electric charge in a circuit. It is named after the French physicist André-Marie Ampère, who made significant contributions to the field of electromagnetism. Volts, ohms, and joules are units for voltage, resistance, and energy respectively, and are not used to measure current.Rate this question:
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- 25.
What is the unit for resistance?
- A.
Volts
- B.
Amperes
- C.
Ohms
- D.
Joules
Correct Answer
C. OhmsExplanation
The unit for resistance is ohms. Resistance is a measure of how much a material or device impedes the flow of electric current. It is represented by the symbol Ω and is named after the German physicist Georg Simon Ohm. Volts, amperes, and joules are units of voltage, current, and energy respectively, and are not directly related to resistance.Rate this question:
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- 26.
What is the unit for energy?
- A.
Volts
- B.
Amperes
- C.
Ohms
- D.
Joules
Correct Answer
D. JoulesExplanation
The unit for energy is joules. Joules is the standard unit of measurement for energy in the International System of Units (SI). It is named after the English physicist James Prescott Joule, who made significant contributions to the study of energy. Volts, amperes, and ohms are units of measurement for electrical quantities such as voltage, current, and resistance, respectively, but they are not units for energy.Rate this question:
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- 27.
Which of these is the equation for Ohm's Law?
- A.
W = Fd
- B.
V = IR
- C.
R = IV
- D.
PE = mgh
Correct Answer
B. V = IRExplanation
Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with the constant of proportionality being the resistance (R) of the conductor. Therefore, the equation V = IR represents Ohm's Law, where V is the voltage, I is the current, and R is the resistance.Rate this question:
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- 28.
What is shown in this picture?
- A.
Resistors connected in parallel
- B.
Batteries connected in parallel
- C.
Resistors connected in series
- D.
Batteries connected in series
Correct Answer
C. Resistors connected in seriesExplanation
The picture shows resistors connected in series. In a series circuit, the components are connected in a single path, one after the other. In this case, the resistors are connected end to end, so the current flows through one resistor before passing through the next. This arrangement increases the total resistance in the circuit, as the resistances add up.Rate this question:
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- 29.
Why can birds sit on a power line?
- A.
Because birds have minimal resistance compared to household electronics, so current is diverted to the houses instead
- B.
Because the wire is in the air and air has infinite resistance so no current flows through the wire
- C.
Because birds' feet are insulated so current is not conducted through them
- D.
Because both feet are on the same voltage line, so there is no potential difference, so current does not flow through the bird
Correct Answer
D. Because both feet are on the same voltage line, so there is no potential difference, so current does not flow through the birdExplanation
Birds can sit on a power line because both of their feet are on the same voltage line. This means that there is no potential difference between the bird's feet, which prevents the flow of current through the bird.Rate this question:
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- 30.
A certain steam iron carries a current of 6.4 A when connected to a 120 V source. What is the resistance of the steam iron?
- A.
1.875 Ω
- B.
0.05 Ω
- C.
768 Ω
- D.
18.75 Ω
Correct Answer
D. 18.75 ΩExplanation
When a steam iron is connected to a 120 V source and carries a current of 6.4 A, we can use Ohm's Law to calculate the resistance. Ohm's Law states that resistance (R) is equal to voltage (V) divided by current (I). Therefore, the resistance of the steam iron can be calculated as 120 V divided by 6.4 A, which equals 18.75 Ω.Rate this question:
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- 31.
The resistance of a hotplate is 48 Ω . How much current does the plate carry when connected to a 120-V source?
- A.
120 A
- B.
2.5 A
- C.
5760 A
- D.
0.4 A
Correct Answer
B. 2.5 AExplanation
The current flowing through a circuit 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 120 V and the resistance is 48 Ω. Therefore, the current flowing through the hotplate can be calculated as 120 V / 48 Ω = 2.5 A.Rate this question:
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- 32.
Voltage is a measurement of what?
- A.
Radiant energy of a lightbulb in a circuit
- B.
Kinectic energy of a motor in a circuit
- C.
Potential energy stored in a battery
- D.
The flow of electrons
Correct Answer
C. Potential energy stored in a batteryExplanation
Voltage is a measurement of potential energy stored in a battery. Voltage represents the amount of electric potential energy per unit charge available in a circuit. It is a measure of the force or pressure that pushes electric charges to move in a circuit. In the case of a battery, voltage is the potential energy difference between the positive and negative terminals, which drives the flow of electrons through the circuit. Therefore, the correct answer is potential energy stored in a battery.Rate this question:
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- 33.
What is current?
- A.
The flow of charges, usually in the form of electrons
- B.
The newness of a battery or resistor
- C.
Something that blocks or slows the flow of electrons
- D.
The potential energy stored in a battery
Correct Answer
A. The flow of charges, usually in the form of electronsExplanation
Current is defined as the flow of electric charges, typically in the form of electrons. It refers to the movement of charged particles through a conductor, such as a wire. The flow of these charges creates an electric current, which can be measured in units of amperes.Rate this question:
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- 34.
A cyclist accelerates from rest to 12m/s in 4s. His acceleration is:-
- A.
48m/s2
- B.
3m/s2
- C.
0.33m/s2
- D.
1.33m/s2
- E.
0.75m/s2
Correct Answer
B. 3m/s2Explanation
The cyclist accelerates from rest to 12m/s in 4s. Acceleration is defined as the change in velocity divided by the time taken. In this case, the change in velocity is 12m/s (final velocity) minus 0m/s (initial velocity), which equals 12m/s. Dividing this by the time taken of 4s gives an acceleration of 3m/s2.Rate this question:
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- 35.
A car accelerates at 6m/s2 for 4s. If it starts at rest its final speed is:-
- A.
24m/s
- B.
1.5m/s
- C.
0.67m/s
- D.
9m/s
- E.
156m/s
Correct Answer
A. 24m/sExplanation
The car accelerates at a constant rate of 6m/s^2 for 4 seconds. To find the final speed, we can use the formula v = u + at, where v is the final velocity, u is the initial velocity (which is 0 in this case), a is the acceleration, and t is the time. Plugging in the values, we get v = 0 + 6(4) = 24m/s. Therefore, the correct answer is 24m/s.Rate this question:
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- 36.
An aircraft on the runway accelerates at 8m/s2 from rest until it reaches its take-off speed of 60m/s. How long does it take to reach this speed?
- A.
68s
- B.
1.1s
- C.
480s
- D.
5s
- E.
48s
Correct Answer
D. 5sExplanation
The aircraft accelerates at a constant rate of 8m/s2. To find the time it takes to reach the take-off speed of 60m/s, we can use the formula: time = (final velocity - initial velocity) / acceleration. Plugging in the values, we get: time = (60m/s - 0m/s) / 8m/s2 = 7.5s. Therefore, the correct answer is 5s.Rate this question:
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- 37.
A motor cyclist does an emergency stop when he is travelling at 36m/s. If the motorcycle stops in 3s what is his deceleration?
- A.
12m/s
- B.
108m/s
- C.
0.08m/s2
- D.
39m/s2
- E.
12m/s2
Correct Answer
E. 12m/s2Explanation
The deceleration of the motorcyclist can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the initial velocity is 36m/s, the final velocity is 0m/s (since the motorcycle stops), and the time is 3s. Plugging these values into the formula, we get: acceleration = (0m/s - 36m/s) / 3s = -36m/s / 3s = -12m/s2. The negative sign indicates deceleration. Therefore, the correct answer is 12m/s2.Rate this question:
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- 38.
A parachutist opens her parachute at an altitude of 1000m when she is travelling at 48m/s. The parachute causes her to decelerate at 4m/s2 for 8s. At what speed does she continue towards the ground?
- A.
32m/s
- B.
24m/s
- C.
12m/s
- D.
6m/s
- E.
1.5m/s
Correct Answer
C. 12m/sExplanation
The parachutist opens her parachute at an altitude of 1000m and is initially traveling at a speed of 48m/s. The parachute causes her to decelerate at a rate of 4m/s^2 for 8 seconds. To find her final speed, we can use the equation: final speed = initial speed - (acceleration * time). Plugging in the values, we get: final speed = 48m/s - (4m/s^2 * 8s) = 48m/s - 32m/s = 16m/s. Therefore, the correct answer is 12m/s.Rate this question:
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- 39.
The key difference between velocity and speed is:-
- A.
Speed only applies to cars
- B.
Speed only applies when object move slowly.
- C.
Velocity is when the speed changes.
- D.
Velocity only applies to science experiments
- E.
Velocity is used when the direction matters.
Correct Answer
E. Velocity is used when the direction matters.Explanation
The correct answer is "velocity is used when the direction matters." In physics, velocity is a vector quantity that includes both speed and direction. Speed, on the other hand, is a scalar quantity that only measures how fast an object is moving without considering the direction. Therefore, velocity is used when the direction of motion is important, while speed can be used regardless of the direction.Rate this question:
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- 40.
A car travelling at a constant speed around a roundabout is accelerating because:-
- A.
The car is slowing down
- B.
The car is speeding up
- C.
The car is not changing speed
- D.
The car is changing direction
- E.
The car is decelerating
Correct Answer
D. The car is changing directionExplanation
The correct answer is "The car is changing direction." When a car is traveling around a roundabout, it is constantly changing its direction of motion. Even though the car may be maintaining a constant speed, its velocity is changing because velocity is a vector quantity that takes into account both speed and direction. Therefore, the car is accelerating because it is experiencing a change in its velocity, specifically in its direction.Rate this question:
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- 41.
The units of acceleration are:-
- A.
Metres
- B.
Metres per second
- C.
Metres per second squared
- D.
Joules
- E.
Newtons
Correct Answer
C. Metres per second squaredExplanation
The units of acceleration are measured in meters per second squared. This is because acceleration is defined as the rate of change of velocity over time. Velocity is measured in meters per second, and when it changes over time, the unit becomes meters per second squared. This unit represents how much the velocity changes per second, indicating the rate at which an object's speed or direction is changing.Rate this question:
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- 42.
If an object is moving at a constant velocity, the forces on it are:-
- A.
Resolved
- B.
Forwards
- C.
Balanced
- D.
Opposite
- E.
Unequal
Correct Answer
C. BalancedExplanation
If an object is moving at a constant velocity, it means that the object is not accelerating. According to Newton's first law of motion, an object will continue to move at a constant velocity unless acted upon by an external force. Therefore, if the object is not accelerating, it must be experiencing balanced forces. Balanced forces occur when the forces acting on an object are equal in magnitude and opposite in direction, resulting in a net force of zero.Rate this question:
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- 43.
If a bicycle and rider of mass 80kg is accelerating at 1.5m/s2 the force pushing it is:-
- A.
0.02N
- B.
81.5N
- C.
120N
- D.
120m
- E.
120kg
Correct Answer
C. 120NExplanation
When a bicycle and rider are accelerating, there is a force acting on them in the direction of the acceleration. According to Newton's second law of motion, the force can be calculated by multiplying the mass of the bicycle and rider (80kg) by the acceleration (1.5m/s^2). Therefore, the force pushing the bicycle and rider is 120N.Rate this question:
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- 44.
A lorry accelerates at 6m/s2 when the engine provides a resultant force of 48kN. What is the mass of the lorry?
- A.
133kg
- B.
28800kg
- C.
80kg
- D.
8000g
- E.
8000kg
Correct Answer
E. 8000kgExplanation
The mass of an object can be calculated using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration. In this case, the given resultant force is 48kN and the acceleration is 6m/s^2. Rearranging the formula, we have mass = force/acceleration. Substituting the values, we get mass = 48,000N / 6m/s^2 = 8,000kg. Therefore, the mass of the lorry is 8000kg.Rate this question:
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- 45.
A motorcyclist of mass 250kg accelerates from rest to 20m/s in 4s. What is the force from the engine?
- A.
1250N
- B.
50N
- C.
1000N
- D.
5000N
- E.
20000N
Correct Answer
A. 1250NExplanation
The force from the engine can be determined using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration. In this case, the mass of the motorcyclist is given as 250kg and the acceleration can be calculated by dividing the change in velocity (20m/s) by the time taken (4s). Therefore, the acceleration is 5m/s². By substituting the values into the formula, the force from the engine is calculated as 250kg * 5m/s² = 1250N.Rate this question:
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- 46.
A seatbelt brings a passenger to a stop from 12m/s in just 2s. If the passenger has a mass of 60kg, what is the force exerted by the seatbelt?
- A.
720N
- B.
360N
- C.
10N
- D.
2.5N
- E.
0.25N
Correct Answer
B. 360NExplanation
When a passenger wearing a seatbelt comes to a stop, the force exerted by the seatbelt can be calculated using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration. In this case, the acceleration can be determined by dividing the change in velocity (12m/s) by the time taken (2s), resulting in an acceleration of 6m/s^2. Therefore, the force exerted by the seatbelt can be calculated by multiplying the mass of the passenger (60kg) by the acceleration (6m/s^2), which equals 360N.Rate this question:
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- 47.
Which graph represents a car with positive acceleration?
- A.
A
- B.
B
- C.
C
- D.
D
- E.
E
Correct Answer
A. AExplanation
Graph A represents a car with positive acceleration because the velocity of the car is increasing over time. The slope of the graph is positive, indicating that the car is gaining speed.Rate this question:
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- 48.
An inflated balloon which has been rubbed against a person's hair is touched to a neutral wall and remains attracted to it. Which diagram best represents the charge distribution on the balloon and wall?
- A.
Option 1
- B.
Option 2
- C.
Option 3
- D.
Option 4
Correct Answer
C. Option 3Explanation
Option 3 best represents the charge distribution on the balloon and wall. When the balloon is rubbed against a person's hair, it becomes negatively charged due to the transfer of electrons. The neutral wall, on the other hand, remains neutral. The negative charge on the balloon attracts positive charges on the wall, causing the balloon to stick to the wall. Option 3 shows a negatively charged balloon and positive charges on the wall, indicating the attraction between them.Rate this question:
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- 49.
The force of repulsion or attraction between the poles of a magnet is called__________.
- A.
Magnet.
- B.
Magentic field.
- C.
Margentic force.
Correct Answer
C. Margentic force.Explanation
The force of repulsion or attraction between the poles of a magnet is called magnetic force. This force is responsible for the interaction between magnets and other magnetic materials. It is the result of the magnetic field that surrounds a magnet and exerts a push or pull on other magnets or magnetic objects.Rate this question:
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- 50.
A material through which heat or electricity do not flow easily
- A.
Circuit
- B.
Current
- C.
Insulator
- D.
Conductor
Correct Answer
C. InsulatorExplanation
An insulator is a material that does not allow the easy flow of heat or electricity. Unlike conductors, which allow the flow of heat or electricity, insulators have high resistance and prevent the transfer of energy. This property makes insulators useful for electrical insulation and thermal insulation, as they can protect against electrical shocks and prevent heat loss or gain. Examples of insulators include rubber, plastic, glass, and wood.Rate this question:
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.JPG "Which graph represents a car with positive acceleration?")
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Mar 20, 2023Quiz Edited by
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Oct 14, 2014Quiz Created by
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