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Physics Test 33
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Physics Test 33
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  • Question 1/10
    1 / -0
    A red flower kept in green light will appear___.
    Solutions
    A red flower kept in green light will appear to be black.
  • Question 2/10
    1 / -0
    In which of the following industries is mica as a raw material?
    Solutions
    Mica is used as a raw material in electrical industries due to superior electrical properties as an insulator and as a dielectric and can support an electrostatic field while dissipating minimal energy in the form of heat.
  • Question 3/10
    1 / -0

    Heat transfer horizontally within the atmosphere is called

    Solutions

    Vertical transfer of heat through the atmosphere is called convection.
    Advection is the term applied to horizontal heat transfer.

  • Question 4/10
    1 / -0
    Noise is measured in
    Solutions
    Noise is a variety of sound. It means any unwanted sound. Sounds, particularly loud ones, that disturb people or make it difficult to hear wanted sounds, are noise. For example, conversations of other people may be called noise by people not involved in any of them; any unwanted sound such as domesticated dogs barking, neighbours playing loud music, portable mechanical saws, road traffic sounds, or a distant aircraft in quiet countryside, is called noise.
  • Question 5/10
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    What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius?

    Solutions
    • When a bowl of ice and water are kept at exactly zero degree Celsius no change will happen. 
    • The zeroth law of thermodynamics says that heat flows from a body of higher temperature to one of lower temperature.
    • In order for ice to melt, it has to absorb heat. In order for water to freeze, it has to release heat. If the mixture is neither absorbing nor releasing heat, ice can't melt and water can't freeze, so we have a stable and unchanging system.
  • Question 6/10
    1 / -0
    The modulus of rigidity is the ratio of_______
    Solutions
    • Modulus of Rigidity is the coefficient of elasticity for a shearing force.
    • It is defined as "the ratio of shear stress to the displacement per unit sample length (shear strain)" .
  • Question 7/10
    1 / -0
    Neutrons are slowed down in a nuclear reactor by _____.
    Solutions

    • A moderator is a material used in a nuclear reactor to slow down the neutrons produced from fission.

    • Control rods are used in nuclear reactors to control the fission rate.

  • Question 8/10
    1 / -0

    If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will

    Solutions
    Yes, the ball would land in exactly the same spot, whether robot or person. Because the Boy, ball and bus are stationary relative to each other.
  • Question 9/10
    1 / -0

    X-rays can be used_______.

    Solutions
    X-rays are a type of radiation called electromagnetic waves.X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. This is because different tissues absorb different amounts of radiation. Uses are:
    • To detect heart diseases.
    • Calcium in bones absorbs x-rays, so bones look white.
    • Fat and other soft tissues absorb less, and look gray.
    • Air absorbs the least, so lungs look black.
    • Chest x-rays can spot pneumonia.
    • Mammograms use x-rays to look for breast cancer.
  • Question 10/10
    1 / -0
    Tape recorder records in the form of :
    Solutions
    Magnetic tape is a medium for magnetic recording, made of a thin, magnetizable coating on a long, narrow strip of plastic film. Devices that record and play back audio and video using magnetic tape are tape recorders and video tape recorders. A device that stores computer data on magnetic tape is known as a tape drive. Magnetic tape revolutionized broadcast and recording. It allowed radio, which had always been broadcast live, to be recorded for later or repeated airing
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