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Physics Test 101
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Physics Test 101
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  • Question 1/10
    1 / -0
    Which instrument is used to measure altitudes in aircraft's?
    Solutions
    An altimeter is an instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry. A pressure altimeter is found in most aircraft.
  • Question 2/10
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    Laws of electrolysis is given by______.
    Solutions
    The laws, which govern the deposition of substances on electrodes during the process of electrolysis is called Faraday's laws of electrolysis. These laws given by Michael Faraday in1833.
  • Question 3/10
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    Red light is used in traffic signal for stopping the traffic because ____.
    Solutions
    The primary reason why the color red is used for traffic signal / danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color.
  • Question 4/10
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    The shape of a rain drop is spherical due to
    Solutions
    The shape of a drop of rain is constrained by the surface tension, which tries to give it the shape for which the surface area is minimum. For a given volume, the spherical shape has the minimum surface area. That is why rain drops acquire spherical shape.
  • Question 5/10
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    The penetrating powers of α, β and γ-radiations, in decreasing order, are______.
    Solutions
    • Radiations from radioactive materials can be dangerous and pose health hazards. By knowing the ability of the different types of radiation to penetrate matter allows us to gain an understanding on how best to protect ourselves.

    • Alpha particles can be absorbed by a thin sheet of paper or by a few centimeters of air. As alpha particles travel through air they collide with nitrogen and oxygen molecules.

    • Beta particles travel faster than alpha particles and carry less charge (one electron compared to the 2 protons of an alpha particle) and so interact less readily with the atoms and molecules of the material through which they pass.

    • Gamma rays are the most penetrating of the radiations. Gamma rays are highly energetic waves and are poor at ionising other atoms or molecules.

    • Therefore the correct decreasing order of penetrating powers of α, β and γ-radiations is : γ, β, α
  • Question 6/10
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    A fuse wire is made of:
    Solutions
    The fuse wire is used on the basis on the Joules law of heating. The law says that when the electric current is allowed to pass through a conductor, the conductor heats up and is proportional to the square of current. This is because practical conductors have definite resistance (normally it is small). Electric fuse wire is an alloy made of tin (63 %) & lead (37 %).When a high current flows through the circuit due to Overloading or a Short circuit, the wires gets heated and melts. As a result, the circuit is broken and current stops flowing.
  • Question 7/10
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    The energy that can harness heat stored below the earth's surface is known as:
    Solutions
    Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.
  • Question 8/10
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    Which of the following instrument is used to measure humidity?
    Solutions
    • A hygrometer is an instrument used for measuring the moisture content in the atmosphere.
    • These devices measure the water vapour of the atmosphere
    • These devices use a material that attracts moisture & that material changes depending on hydration.
  • Question 9/10
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    Fat can be separated from milk in a cream separator because of:
    Solutions
    Cream separation is a phenomenon by which the milk is separated in to cream and skim milk by centrifugal force. The centrifugal force is thousand times greater than gravitational force. The milk enters the rapidly revolving bowl of the separator.
  • Question 10/10
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    Direct conversion of solar energy with the use of a photo voltaic cell results in the production of
    Solutions
    Direct conversion of solar energy with the use of a photo voltaic cell results in the production of Electrical energy. A solar cell, or photovoltaic cell, is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical and chemical phenomenon.
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