Physics miscellaneous

Physics miscellaneous

Easy Questions

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Physics miscellaneous
  1. Fiber optics cable used in communication, works on the principle of








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    The use of a long strand of plastic (or other material such as glass) to pipe light from one end of the medium to the other is the basis for modern day use of optical fibers. Since total internal reflection takes place within the fibers, no incident energy is ever lost due to the transmission of light across the boundary.

    Correct Option: D

    The use of a long strand of plastic (or other material such as glass) to pipe light from one end of the medium to the other is the basis for modern day use of optical fibers. Since total internal reflection takes place within the fibers, no incident energy is ever lost due to the transmission of light across the boundary.

  1. The dimension MLT–2 corresponds to








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    The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.

    Correct Option: A

    The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.

  1. Which one of the following is responsible for the working of Newton’s colour disc experiment ?








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    A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.

    Correct Option: C

    A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.

  1. The ordinary and maximum tolerance limit of sound by human being is








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    Normal speech is about 60 dB (decibels). A dangerous sound is anything that is 80 dB or higher which can lead to hearing loss. At 70 dB or lower, the risk of harm to healthy ears is negligible. Listening to sound above 80 decibels can cause profound deafness.

    Correct Option: B

    Normal speech is about 60 dB (decibels). A dangerous sound is anything that is 80 dB or higher which can lead to hearing loss. At 70 dB or lower, the risk of harm to healthy ears is negligible. Listening to sound above 80 decibels can cause profound deafness.

  1. Time of exposure required for taking photograph of an object depends upon the








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    In photography, shutter speed or exposure time is the effective length of time a camera’s shutter is open. The total exposure is proportional to this exposure time, or duration of light reaching the film or image sensor. The correct exposure for a particular object depends on the brightness of the object to be photographed.

    Correct Option: A

    In photography, shutter speed or exposure time is the effective length of time a camera’s shutter is open. The total exposure is proportional to this exposure time, or duration of light reaching the film or image sensor. The correct exposure for a particular object depends on the brightness of the object to be photographed.