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Physics Test 65
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Physics Test 65
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  • Question 1/10
    1 / -0
    Hydroscope is an instrument that used to __________.
    Solutions
    • Hydroscope is an optical device for enabling a person to see an object at a considerable distance below the surface of the water by means or a series of mirrors enclosed in a steel tube.
    • The hydrophone is an instrument used for recording sound underwater. 
  • Question 2/10
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    Which one of the following reflects back more sunlight as compared to other three?
    Solutions
    Albedo is the fraction of solar energy (shortwave radiation) reflected from the Earth back into space. It is a measure of. the reflectivity of the earth's. surface. Ice, especially with snow on top of it on land, has the highest albedo. The albedo of given sources is as follows:
    • Fresh snow or ice: 60-90% or 80-95%;
    • Desert sand: 30-50%;
    • Prairie Grasslands: 18-25% or 20%;
    • Crops: = 10-25%
  • Question 3/10
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    Cryogenics is:
    Solutions
    • In physics, cryogenics is the study of the production and behavior of materials at very low temperatures.
    • It is not well defined at what point on the temperature scale refrigeration ends and cryogenics begins, but scientists assume it starts at or below – 150oC (123 k, -238oF).
  • Question 4/10
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    Which of the following is an example of simple harmonic motion?
    Solutions
    When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.
  • Question 5/10
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    In which of the following layer of atmosphere the absorption and scattering of the solar ultraviolet radiation takes place?
    Solutions
    Solar ultraviolet radiation undergoes absorption and scattering as it passes through the stratospheric layer of the earth's atmosphere. The ozone layer, a region of Earth's stratosphere, absorbs 97-99% of the Sun's ultraviolet (UV) radiation. As a result, no UV radiation at wavelengths shorter than 290 nm reaches the surface of the earth.
  • Question 6/10
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    The cooling by a desert Cooler is based on:
    Solutions
    Nature's most efficient means of cooling is through the evaporation of water. Desert coolers make use of evaporative cooling that works on the principle of heat absorption by moisture evaporation. As water is evaporated, energy is lost from the air, reducing the temperature. Thus, cooling effect is produced.
    Hence option C is the right answer.
  • Question 7/10
    1 / -0
    The minimum number of forces to keep a particle in equilibrium is
    Solutions
    When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction , but opposite in sense , to the first force. This second force which restores equilibrium , is called the equilibrant.
  • Question 8/10
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    A needle or a pin floats on the surface of the water because of ________.
    Solutions

    The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. The surface tension of the water leads to forces strong enough to support the needle’s weight.
    Hence option A is the right answer.

  • Question 9/10
    1 / -0
    The work done by the string of a simple pendulum during one complete oscillation is equal to____
    Solutions
    • Work done by the string of the simple pendulum during one complete oscillation Is zero.
    • Tension in the string exactly cancels the component parallel to the string. This leaves a net restoring force back toward the equilibrium position as equal to zero.
  • Question 10/10
    1 / -0
    In the remote control of television, which electromagnetic waves are used?
    Solutions
    • In the remote control of television, infrared electromagnetic waves are used.
    • Infrared remote controls are relatively low powered and will send signals only about 10–20m .
    • Like visible light, infrared is relatively low-energy electromagnetic radiation and, unlike radio waves, cannot penetrate through solid walls.
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