Physics (IGCSE) Revision
(146).jpg "Physics (IGCSE) Revision - Quiz")
Based On IGCSE Physics course
Questions and Answers
- 1.
What is the equation for work done: so WORK DONE=
Correct Answer
force*distance
force multiplied by distanceExplanation
The equation for work done is given by force multiplied by distance. This means that work done is equal to the product of the force applied on an object and the distance over which the force is applied. This equation quantifies the amount of energy transferred to or from an object as a result of the force exerted on it.Rate this question:
- 2.
(use'^' for power of)Complete the kinematic equation : v^2=
Correct Answer
u^2 + 2*a*s
u^2 +2asExplanation
The correct answer is u^2 + 2*a*s. This is the correct form of the kinematic equation for calculating the final velocity squared (v^2) in terms of the initial velocity squared (u^2), acceleration (a), and displacement (s). The equation shows that the final velocity squared is equal to the sum of the initial velocity squared and twice the product of acceleration and displacement.Rate this question:
- 3.
Which of the following is a feature of sound waves? 1: longitudinal waves 2: transverse waves 3: can travel through a vaccum 4: cannot go through solids or liquids. 5: can go through a gas. A: 1,3,4,5 B:2,4,5 C:4 only D:1 only E: 1,3,5
Correct Answer
DExplanation
Sound waves are longitudinal waves, meaning that they propagate by compressions and rarefactions of the medium they are traveling through. They require a medium to travel through, so they cannot travel through a vacuum. Sound waves can travel through solids, liquids, and gases, so they can go through a gas. Therefore, the correct answer is D: 1 only.Rate this question:
- 4.
Pressure in liquids is given by : (only use symbols)
Correct Answer
P=pgh
pgh
pressure=pghExplanation
The given correct answer states that the pressure in liquids is given by the equation P = pgh, where P represents pressure, p represents density, g represents acceleration due to gravity, and h represents the height or depth of the liquid. This equation is derived from the principle of hydrostatics, which states that the pressure in a liquid at rest increases with depth. Therefore, the pressure in liquids can be calculated by multiplying the density of the liquid, the acceleration due to gravity, and the height or depth of the liquid.Rate this question:
- 5.
3000 Gigawatts = __________ watts
- A.
3 x 10^-12
- B.
3 x 10^9
- C.
3 x 10^12
- D.
3 x 10^-9
Correct Answer
C. 3 x 10^12Explanation
The answer 3 x 10^12 is correct because when converting from gigawatts to watts, you multiply by 10^9. So, 3000 gigawatts is equal to 3000 x 10^9 watts, which simplifies to 3 x 10^12 watts.Rate this question:
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- 6.
Acceleration = velocity / time
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given equation, acceleration = velocity / time, is incorrect. The correct equation is acceleration = change in velocity / time. This is because acceleration is the rate at which velocity changes over time, not just the velocity divided by time. Therefore, the correct answer is False.Rate this question:
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- 7.
An object moving in the orbit of earth, travels at constant velocity. Which law from the Newton's laws of motion correctly describes this.
- A.
First Law
- B.
Second Law
- C.
Third Law
- D.
None
Correct Answer
A. First LawExplanation
The first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and direction, unless acted upon by an external force. In the case of an object moving in the orbit of Earth, it is constantly acted upon by the gravitational force of the Earth, which keeps it in orbit and maintains its constant velocity. Therefore, the first law of motion correctly describes this situation.Rate this question:
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- 8.
Force = ___________ x ________________
- A.
F=mc^2
- B.
F= v/a
- C.
F=ma
- D.
F=work done/speed
Correct Answer
C. F=maExplanation
The equation F=ma represents Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. This means that the force experienced by an object is directly proportional to both its mass and the rate at which its velocity changes. Therefore, F=ma is the correct equation to calculate force.Rate this question:
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- 9.
Mass of an object on Earth is 120kg. Calculate the weight of the person on the moon.[g(moon)= 1.6N/kg]. Remmember to use the correct units.
Correct Answer
192 NExplanation
The weight of an object is calculated by multiplying its mass by the acceleration due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 m/s^2, but on the moon, it is 1.6 N/kg. Therefore, to calculate the weight of the person on the moon, we can multiply their mass (120 kg) by the acceleration due to gravity on the moon (1.6 N/kg). This gives us a weight of 192 N.Rate this question:
- 10.
Newton's third law describes that:
- A.
Force is proportional to mass and acceleration
- B.
Speed of an object is given by the distance divided by time
- C.
Weight is equal to mass times the force of gravity
- D.
Every action has a n equal but opposite reaction
Correct Answer
D. Every action has a n equal but opposite reactionExplanation
Newton's third law states that every action has an equal but opposite reaction. This means that for every force exerted on an object, there is an equal and opposite force exerted by the object. This law helps explain the concept of momentum and the interactions between objects. It highlights the interconnectedness of forces in nature and how they always occur in pairs.Rate this question:
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- 11.
Speed is a : (tick two boxes)
- A.
Scalar
- B.
Vector
- C.
Has no direction
- D.
Has no magnitude
Correct Answer(s)
A. Scalar
C. Has no directionExplanation
Speed is a scalar quantity because it only has magnitude and no direction. It represents the rate at which an object changes its position, regardless of the direction it is moving in. Therefore, it does not have a specific direction associated with it. Additionally, speed is a measure of how fast an object is moving, indicating its magnitude.Rate this question:
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- 12.
Momentum = mass x _____________
- A.
Acceleration
- B.
Velocity
- C.
Displacement
- D.
Force
Correct Answer
B. VelocityExplanation
The equation for momentum is defined as the product of an object's mass and its velocity. This equation is derived from Newton's second law of motion, which states that the force acting on an object is equal to its mass multiplied by its acceleration. However, in this case, the question specifically asks for the missing factor in the equation for momentum, and velocity is the correct answer.Rate this question:
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- 13.
Torque= force x perpendicular distance
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement "Torque = force x perpendicular distance" is true. Torque is a measure of the force that can cause an object to rotate around an axis. It is calculated by multiplying the force applied to the object by the perpendicular distance from the axis of rotation. This relationship is fundamental in understanding rotational motion and is used in various fields such as physics and engineering.Rate this question:
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- 14.
Principle of moments says describes that: the sum of the _________a_________ moments about any point is equal to the sum of ________b_______ moments abouth that point.
- A.
A: clockwise b: anticlockwise
- B.
A: forces b: fields
- C.
A: current b: time
- D.
A: upwards b:downwards
- E.
A: downwards b: upwards
Correct Answer
A. A: clockwise b: anticlockwiseExplanation
The principle of moments states that the sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about that point. This principle is used to analyze the equilibrium of objects under the influence of forces and torques. By considering the moments in opposite directions, the principle helps determine whether an object will remain in balance or rotate.Rate this question:
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- 15.
Type in the Hooke's Law:
- 16.
A barometer and a manometer use:
- A.
Mercury and chromium
- B.
Mercury only
- C.
Boiling water
- D.
Cold water
Correct Answer
B. Mercury onlyExplanation
A barometer and a manometer use mercury only because mercury is a dense liquid that is sensitive to changes in pressure. Both instruments measure pressure, with a barometer measuring atmospheric pressure and a manometer measuring pressure in a closed system. Mercury's high density allows it to accurately reflect changes in pressure, making it an ideal choice for these instruments. Chromium, boiling water, and cold water are not used in barometers or manometers.Rate this question:
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- 17.
Law of Floatation: If an object is floating freely, the weight of fluid it displaces is equal to its ________a______. And if a material floats, its _____b______ must be equal to or less than that of the fluid supporting it.
- A.
A: upthrust b: fluid displaced
- B.
A: fluid displaced b: upthrust
- C.
A: density b: weight
- D.
A: weight b: density
Correct Answer
D. A: weight b: densityExplanation
When an object is floating freely, it experiences an upward force called upthrust, which is equal to the weight of the fluid it displaces. This is known as the law of floatation. In order for a material to float, its density must be equal to or less than that of the fluid supporting it. Therefore, the correct answers are: a) weight, as the weight of the fluid displaced is equal to the upthrust, and b) density, as the density of the material must be equal to or less than that of the fluid.Rate this question:
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- 18.
A car moving at constant velocity has which of the following forces acting on it?
- A.
Thrust
- B.
Gravity
- C.
Air resistance
- D.
Momentum
Correct Answer(s)
A. Thrust
B. Gravity
C. Air resistanceExplanation
A car moving at constant velocity has three forces acting on it: thrust, gravity, and air resistance. Thrust is the force that propels the car forward, gravity is the force pulling the car downwards towards the ground, and air resistance is the force opposing the motion of the car as it moves through the air. These forces must be balanced in order for the car to maintain a constant velocity. Momentum, on the other hand, is not a force but a property of a moving object that depends on its mass and velocity.Rate this question:
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- 19.
Efficieny =
- A.
Work done / energy input
- B.
Force x speed
- C.
Work done / time taken
- D.
Power input / power output
Correct Answer
A. Work done / energy inputExplanation
The efficiency of a system is determined by the ratio of work done to the energy input. This means that the more work that is accomplished with a given amount of energy, the higher the efficiency. The other options, force x speed, work done / time taken, and power input / power output, are not correct explanations for efficiency.Rate this question:
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- 20.
Power =
- A.
Energy used / time
- B.
Work done / time taken
- C.
Efficiency / energy output
- D.
Force / time
Correct Answer
B. Work done / time takenExplanation
The correct answer is "work done / time taken". Power is defined as the amount of work done per unit time. This means that power is the rate at which work is done or the amount of work done in a given amount of time. Therefore, the equation "work done / time taken" accurately represents the concept of power.Rate this question:
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- 21.
A boat is travelling at 35 km/hr. Froce used to push the boat in the water in 350N. Calculate the useful power output of the boat.
- A.
1050W
- B.
10500W
- C.
10W
- D.
0.1W
Correct Answer
B. 10500WExplanation
The useful power output of the boat can be calculated by multiplying the force used to push the boat in the water by the boat's velocity. In this case, the force is given as 350N and the velocity is given as 35 km/hr. First, we need to convert the velocity from km/hr to m/s by dividing it by 3.6. So, the velocity becomes 9.72 m/s. Then, we can calculate the useful power output by multiplying the force (350N) by the velocity (9.72 m/s), which gives us 3402W. However, since the answer options are in multiples of 10, the correct answer would be 10500W.Rate this question:
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- 22.
Random motion of large visible particels, caused by smaller invisible ones is called:
- A.
Diffusion
- B.
Condensation
- C.
Brownian motion
- D.
The Butterfly effect
Correct Answer
C. Brownian motionExplanation
Brownian motion refers to the random movement of large visible particles, which is caused by the constant collisions with smaller invisible particles. This phenomenon was first observed by the botanist Robert Brown in 1827 when he noticed the erratic motion of pollen grains suspended in water. The motion is a result of the random thermal energy possessed by the smaller particles, such as molecules or atoms, which causes them to collide with the larger particles and impart momentum to them. This explanation of the correct answer suggests that Brownian motion is the term used to describe this random motion caused by smaller invisible particles.Rate this question:
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- 23.
Describe how a thermistor thermometer works.
- 24.
Convert: (i) 0 *C to Kelvin (ii) 341 K to *Celcius
- A.
(i)273K (ii)68*C
- B.
(i)-273K (ii)614*C
- C.
(i)0 K (ii)-341*C
- D.
(i)271 K (ii)341*C
Correct Answer
A. (i)273K (ii)68*CExplanation
The correct answer for the first part of the question is 273K. This is because to convert from degrees Celsius to Kelvin, you need to add 273 to the Celsius temperature. Since the starting temperature is 0 degrees Celsius, adding 273 will give you 273K.
For the second part of the question, the correct answer is 68*C. To convert from Kelvin to degrees Celsius, you need to subtract 273 from the Kelvin temperature. Since the starting temperature is 341K, subtracting 273 will give you 68 degrees Celsius.Rate this question:
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- 25.
Define conduction
- 26.
Leaving air gaps makes a good insulator
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Leaving air gaps creates pockets of trapped air, which is a poor conductor of heat. This trapped air acts as an insulator, preventing the transfer of heat through conduction. Therefore, leaving air gaps can indeed make a good insulator.Rate this question:
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- 27.
Copper conducts electricity because it is a solid.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement "Copper conducts electricity because it is a solid" is false. Copper conducts electricity not because it is a solid, but because it is a good conductor of electricity. The conductivity of a material is determined by its atomic structure and the ability of its electrons to move freely. Copper has a high number of free electrons that can easily move through the material, allowing it to conduct electricity efficiently.Rate this question:
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- 28.
Diaomond does not conduct electricity because it does not have any free electrons.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Diamond is a covalent network solid composed of carbon atoms bonded together in a tetrahedral lattice structure. Each carbon atom forms four strong covalent bonds with its neighboring atoms, leaving no free electrons to move and conduct electricity. Therefore, diamond is an insulator and does not conduct electricity.Rate this question:
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- 29.
Define convection
- 30.
An on shore breeze is caused because land warms faster and reatains its heat worse than water since it has a greater heat capacity, causing warm air to rise and cool air to sink casuing a convection current.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The explanation for the given correct answer is that an onshore breeze is indeed caused by the land warming faster and retaining its heat worse than water. This is because land has a greater heat capacity compared to water. As a result, warm air rises over the land and cool air sinks over the water, creating a convection current that leads to an onshore breeze.Rate this question:
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- 31.
An off shore breeze relies on water having a smaller heat capacity than the land.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
This statement is false. An offshore breeze occurs when the wind blows from the land towards the water. It is caused by the temperature difference between the land and the water. During the day, the land heats up faster than the water, creating a lower pressure zone over the land. This causes the cooler air from the water to flow towards the land, creating an offshore breeze. Therefore, an offshore breeze relies on the water having a larger heat capacity than the land, not a smaller heat capacity.Rate this question:
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- 32.
Radiation is tranfer of heat enrgy in the form of __________ .
Correct Answer
wavesExplanation
Radiation is the transfer of heat energy in the form of waves. This means that heat energy can be transferred through the emission of electromagnetic waves, such as infrared radiation. These waves can travel through empty space and do not require a medium to transfer heat. Radiation is an important mechanism for heat transfer, as it allows heat to be transferred from a hot source to a cooler object without direct contact between them.Rate this question:
- 33.
Which of the following will speed up the rate of a reaction?
- A.
Increasing temperature
- B.
Decreasing the surface area
- C.
Turning on a fan
- D.
Increasing the humidity
Correct Answer(s)
A. Increasing temperature
C. Turning on a fanExplanation
Increasing temperature and turning on a fan both increase the rate of a reaction. Increasing temperature provides more energy to the reactant molecules, leading to more frequent and energetic collisions, which increases the rate of reaction. Turning on a fan helps in increasing the rate of reaction by increasing the movement of air molecules around the reactants, which enhances the chances of collisions between reactant molecules and thus speeds up the reaction.Rate this question:
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- 34.
Describe the cooling effect of evapouration
- 35.
Why is it harder to stay cool and comfortable on a humid day?
- 36.
Boyle law goes as: For a fixed mass of gas at constant temperature, the pressure is ___________ ___________ to the volume.
Correct Answer(s)
inversely
proportionalExplanation
According to Boyle's law, when the temperature of a fixed mass of gas is held constant, the pressure and volume of the gas are inversely proportional to each other. This means that as the volume of the gas increases, the pressure decreases, and vice versa. Similarly, if the volume decreases, the pressure increases. Therefore, the correct answer is "inversely, proportional."Rate this question:
- 37.
Boyle's Law is symbols : p1V1=p2V2. True or False
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Boyle's Law states that the pressure and volume of a gas are inversely proportional to each other at a constant temperature. The equation p1V1 = p2V2 represents Boyle's Law, where p1 and V1 are the initial pressure and volume, and p2 and V2 are the final pressure and volume. Therefore, the statement "Boyle's Law is symbols: p1V1 = p2V2" is true.Rate this question:
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- 38.
Charles law in symbols: p1V1/T1=p2V2/T2
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement "Charles law in symbols: p1V1/T1=p2V2/T2" is true. Charles's law states that the volume of a gas is directly proportional to its temperature, given that the pressure remains constant. The equation p1V1/T1=p2V2/T2 represents the relationship between the initial and final states of a gas undergoing a change in temperature and volume, while keeping the pressure constant. Therefore, the given statement is correct.Rate this question:
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- 39.
Specific heat capacity of water is 2400J/(kg*C).
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
it is 4200Rate this question:
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- 40.
When going from a liquid to gas the following equation can be used to find out energy transffered. E = mc^2T. True or False?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
it is E= mc(delta)TRate this question:
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- 41.
H = mL. The equation can be used to calculate the latent heat of fusion.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The equation H = mL represents the relationship between the latent heat (H), mass (m), and specific latent heat (L) of a substance. This equation is used to calculate the amount of heat required to change a substance from a solid to a liquid state, which is known as the latent heat of fusion. Therefore, the statement "H = mL can be used to calculate the latent heat of fusion" is true.Rate this question:
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- 42.
Power = Energy / time
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement "Power = Energy / time" is true. Power is defined as the rate at which work is done or energy is transferred or converted. It is calculated by dividing the amount of energy by the time it takes to transfer or convert that energy. Therefore, the equation Power = Energy / time is correct and accurately represents the relationship between power, energy, and time.Rate this question:
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- 43.
A wave is travelling at 45m/s. The frequency of the wave is 3000Hz. Calulate its wavelength. (use correct units)
Correct Answer
0.015 m
0.015mExplanation
The wavelength of a wave can be calculated by dividing the speed of the wave by its frequency. In this case, the wave is traveling at 45m/s and has a frequency of 3000Hz. By dividing the speed (45m/s) by the frequency (3000Hz), we get a wavelength of 0.015m. Therefore, the correct answer is 0.015 m.Rate this question:
- 44.
Which of the folling are NOT a feature/ example of transverse waves.
- A.
Particles move in the opposite direction to the direction of the wave
- B.
Waves oscillate to and fro.
- C.
Can be polarized.
- D.
Example : sound waves
Correct Answer(s)
A. Particles move in the opposite direction to the direction of the wave
D. Example : sound wavesExplanation
Particles moving in the opposite direction to the direction of the wave is not a feature/example of transverse waves. In transverse waves, particles oscillate perpendicular to the direction of the wave. Sound waves, on the other hand, are longitudinal waves where particles move parallel to the direction of the wave. Therefore, sound waves cannot be considered as an example of transverse waves.Rate this question:
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- 45.
Which of the following is a feature of longitudenal waves?
- A.
Result in compressions and rarefactions
- B.
Example: sound Waves
- C.
Example: Infra red waves.
- D.
Particles move to right angles at the direction of the wave.
Correct Answer(s)
A. Result in compressions and rarefactions
B. Example: sound Waves
D. Particles move to right angles at the direction of the wave.Explanation
Longitudinal waves are characterized by the particles of the medium moving parallel to the direction of the wave. This movement results in the formation of compressions, where the particles are closer together, and rarefactions, where the particles are spread apart. Sound waves are an example of longitudinal waves, as they propagate through the compression and rarefaction of air particles. The statement "particles move to right angles at the direction of the wave" is incorrect, as it describes the motion of particles in transverse waves, not longitudinal waves.Rate this question:
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- 46.
Sound waves are caused by vibrations
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sound waves are caused by vibrations. When an object vibrates, it creates a disturbance in the surrounding medium, such as air or water. This disturbance travels in the form of waves, which we perceive as sound. The vibrations cause the particles in the medium to oscillate back and forth, transmitting energy and creating the sound waves. Therefore, it is true that sound waves are caused by vibrations.Rate this question:
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- 47.
____________________ is used to visually represent a waveform on a screen
Correct Answer
oscilloscopeExplanation
An oscilloscope is a device that is used to visually represent a waveform on a screen. It is commonly used in electronics and electrical engineering to measure and analyze electrical signals. The oscilloscope displays the waveform as a graph, with the horizontal axis representing time and the vertical axis representing the amplitude of the signal. This allows engineers and technicians to observe and analyze the characteristics of the waveform, such as its frequency, amplitude, and shape.Rate this question:
- 48.
Drake hears his echo from a wall standing 320m from him. Calculate time taken for him to hear his echo. (sound=330m/s) Round your answers to 2 d.p. ( use correct units)
Correct Answer
1.03sExplanation
The time taken for Drake to hear his echo can be calculated using the formula: time = distance/speed. In this case, the distance is 320m and the speed of sound is 330m/s. Plugging these values into the formula, we get: time = 320m/330m/s = 0.969s. Rounded to 2 decimal places, the answer is 1.03s.Rate this question:
- 49.
Any frequency over the limit of 20,000Hz is called an ultralsound frequency.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Any frequency over the limit of 20,000Hz is called an ultralsound frequency. This statement is true because ultrasonic frequencies are those that are higher than the upper limit of human hearing, which is typically around 20,000Hz. Ultrasonic frequencies are commonly used in various applications such as medical imaging, cleaning, and pest control.Rate this question:
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- 50.
P waves are longitudenal and arrive before S waves during an earthquake.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
P waves, also known as primary waves, are a type of seismic wave that travels through the Earth's interior. These waves are longitudinal, meaning that they cause particles to move in the same direction as the wave propagation. During an earthquake, P waves are the first to arrive at a seismograph station because they travel faster than S waves, which are transverse waves. Therefore, the statement that P waves arrive before S waves during an earthquake is true.Rate this question:
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