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- Question
Which mirror is used as rear view mirror in vehicles?
Options- A. Concave
- B. Plane
- C. Convex
- D. Any of the above
- Correct Answer
- Convex
ExplanationConvex mirror is used as rear view mirror in vehicles. Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than a plane mirror. This is why they are useful.
- 1. In general, which is the cause of a sea breeze?
Options- A. Pressure
- B. Specific heat
- C. Heat
- D. All the above Discuss
- 2. Visible light has a higher frequency than
Options- A. Radio waves
- B. X rays
- C. Ultra violet
- D. All the above Discuss
- 3. Sound waves cannot travel in
Options- A. Vacuum
- B. Water
- C. Glass
- D. Hydrogen gas Discuss
- 4. Q = mcdT refers to
Options- A. Enthalpy formula
- B. Heat Transfer formula
- C. Specific Heat formula
- D. Heat of Vaporization Discuss
- 5. Acceptable noise level for human ear
Options- A. > 85 db
- B. = 85 db
- C. < 85 db
- D. None of the above Discuss
- 6. In general, which is the cause of a land breeze?
Options- A. Pressure
- B. Heat
- C. Temperature
- D. None of the above Discuss
- 7. Magnetic domains normally occur in
Options- A. copper
- B. silver
- C. iron
- D. All of the above Discuss
- 8. Which elements are malleable and good conductors of electricity?
Options- A. tin and silver
- B. iodine and silver
- C. tin and xenon
- D. iodine and xenon Discuss
- 9. Second and third class levers are differentiated by
Options- A. the location of the load
- B. the location of the fulcrum
- C. the presence of multiple loads
- D. the type of fulcrum present Discuss
- 10. Long Sightedness means
Options- A. near images are blurry
- B. far images are blurry
- C. Both A & B
- D. None of the above Discuss
Physics problems
Search Results
Correct Answer: Specific heat
Explanation:
The usual cause of sea breeze is the difference in specific heat capacity between land and water Land heats and cools more quickly than water.
What is the cause of a sea breeze?
The air over the land is warmed and rises, to a greater temperature than that over the sea. This produces a convection current, with cooler air flowing in from over the sea to replace that rising from the land. At night the land cools more than the sea, so the action reverses to produce a land-breeze, blowing off the land.
Correct Answer: Radio waves
Explanation:
Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies.
Ultraviolet Light (UV). part of the electromagnetic spectrum that consists of waves with frequencies higher than those of visible light and lower than those of x-rays.
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.
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: < 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: Temperature
Explanation:
The land breeze is a coastal breeze at night blowing from the land to the ocean. It is caused by the difference in the rates of cooling of the land and of the ocean. Once again, the bigger the difference in temperature between the two, the stronger the wind.
Correct Answer: iron
Explanation:
A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction.
Correct Answer: tin and silver
Explanation:
Tin and Silver are malleable and good conductors of electricity. The other combinations have a non metal in them which are bad conductors.
Correct Answer: the location of the load
Correct Answer: near images are blurry
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