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- Question
Sound travels fastest in
Options- A. Vacuum
- B. Air
- C. Glass
- D. Water
- Correct Answer
- Glass
ExplanationSound is a mechanical vibration and needs a medium for propagation. The higher the density of the medium, the faster the sound travels. So, sound cannot travel through vacuum.
As the sound travels faster in solids than liquids and gases, sound travels faster in the glass than Air and water.
- 1. What is needed for steering control on a PWC? Discuss
- 2. What part of the atom has a positive charge?
Options- A. Neutron
- B. Proton
- C. Electron
- D. All the above Discuss
- 3. What is the relationship between Resistivity and Conductivity? Discuss
- 4. Which of the following is not an aerosol?
Options- A. mud
- B. dust
- C. smoke
- D. fog Discuss
- 5. Which of the following properties is found only in ferromagnetic materials ?
Options- A. Susceptibility independent of temperature
- B. Point in a particular direction
- C. Hysteresis
- D. Attracting a magnetic substance Discuss
- 6. How many bottles of water is a gallon?
Options- A. 16
- B. 8
- C. 4
- D. 2 Discuss
- 7. Light travels fastest in
Options- A. Air
- B. Water
- C. Glass
- D. Diamond Discuss
- 8. Acceptable noise level for human ear
Options- A. > 85 db
- B. = 85 db
- C. < 85 db
- D. None of the above Discuss
- 9. Q = mcdT refers to
Options- A. Enthalpy formula
- B. Heat Transfer formula
- C. Specific Heat formula
- D. Heat of Vaporization Discuss
- 10. Sound waves cannot travel in
Options- A. Vacuum
- B. Water
- C. Glass
- D. Hydrogen gas Discuss
Physics problems
Search Results
Correct Answer: PWC refers to Personal Water Crafts To control steering on a PWC, the most needed requirement is to have power in which will allows the one using it to control the engine for it to stop or for it to move Without power, the person using it could be out of balance or fail to start the engine This is the basic requirement because even though it is shut off or the engine is off, the PWC is still on and it could still move without proper knowledge of the engine
Correct Answer: Proton
Explanation:
Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.
Correct Answer: Resistivity : Resistivity is a measure of the resistance to the flow of electrons Conductivity : Conductivity is just the inverse of resistivity, ? = 1/?, where ? is conductivity and ? is resistivity Example: Think of a pipe and water, the bigger the pipe, the easier water can flow and thus the lower the resistance
Correct Answer: mud
Explanation:
Among the given options, mud is not an aerosol.
An aerosol is a suspension of fine solid particles or liquid droplets, in the air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are haze, particulate air pollutants, and smoke.
Correct Answer: Hysteresis
Correct Answer: 8
Explanation:
The easiest way would measure it through half a liter water bottle. There are approximately 16.9 ounces(oz) of water in a 500ml water bottle.
Gallon is an imperial customary volume unit for the U.S.
As we have previously mentioned, the 16.9oz bottle is also known as 500ml in the metric system. According to U.S. standard, 1 gallon stands for 128 fluid oz.
Hence, Number of bottles in 1 gallon = 128/16.9 = 7.57 =~ 8.
Correct Answer: Air
Explanation:
Light travels fastest in Vacuum. The fastest thing in the whole universe is the speed of light in a vacuum like outer space. It is about 2.99 x 108 m/s.
Correct Answer: < 85 db
Explanation:
Sound intensity or level is measured by a unit called a decibel. An 85 decibel noise level is not a safe standard for the public.
Hence, Acceptable noise level for human ear is less than 85 db.
Correct Answer: Specific Heat formula
Explanation:
Q = mc?T refers to Specific Heat formula.
When heat energy is added to a substance, the temperature will change by a certain amount.
The relationship between heat energy and temperature is different for every material, and the specific heat is a value that describes how they relate.
Q = mc?T
Q = heat energy (Joules, J)
m = mass of a substance (kg)
c = specific heat (units J/kg?K)
?T = change in temperature (Kelvins, K)
Correct Answer: Vacuum
Explanation:
A Sound wave needs a medium for propogation. Hence, Sound cannot travel through a vacuum.
A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.
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