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Physics Test 112
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Physics Test 112

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  • Question 1/10
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    The velocity of light is maximum in ______.
    Solutions
    The speed of light is a universal physical constant. Its value in vacuum is exactly 299792458 metres per second.
  • Question 2/10
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    A typical example of a semiconductor is _______?
    Solutions
    Germanium is a chemical element with symbol Ge and atomic number 32. It is a lustrous, hard, grayish-white metalloid in the carbon group, Purified germanium is a semiconductor.
  • Question 3/10
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    The filament of bulb is of______.
    Solutions
    • Tungsten retains its strength at high temperatures and has a high melting point. 
    • Elemental tungsten is used in many high-temperature applications such as light bulb, cathode-ray tube and vacuum tube filaments, heating elements, and rocket engine nozzles.
  • Question 4/10
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    In which of the following industries is mica as a raw material?
    Solutions
    Mica is a raw material of electrical industries.
    The raw materials needed to produce cement (calcium  carbonate, silica, alumina and iron ore) are generally extracted from limestone rock, chalk, clayey schist or clay.
    Raw materials to the industrial ceramics and glass industries, including such materials as clay, silica, alumina, feldspar, metallic oxides
  • Question 5/10
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    When an ebonite rod is rubbed with fur, the charge acquired by the fur is ________.
    Solutions
    When you rub fur with ebonite rod, the chemical bond is formed between some parts of the the two surface. Rod has its electron more tightly bound than fur. So, fur donates electrons to the rod while electrons from rod won't come out. Due to excess of electrons in rod, it becomes negatively charged while the fur with lost electrons, becomes deficient of electrons. Thus, fur becomes positively charged.
  • Question 6/10
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    Cloudy nights are warmer compared to clear nights, because clouds mainly_______.
    Solutions
    • When the sun's rays hit clouds, they are reflected back into space, never reaching the ground.
    • Thus, cloudy days are cooler than sunny days. However, at night clouds act as a "blanket" preventing heat loss from the earth.
    • As a result, cloudy nights generally are warmer than clear nights.
  • Question 7/10
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    The substances which have infinitely high electrical resistance are called_____.
    Solutions

      • Insulators have infinitely high electrical resistance.

      • An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it impossible to conduct an electric current under the influence of an electric field.

      • This contrasts with other materials, semiconductors and conductors, which conduct electric current more easily.

      • Insulators have higher resistivity than semiconductors or conductors.
  • Question 8/10
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    Which of the following is not nucleon?
    Solutions
      A nucleon is either a proton or a neutron, considered in its role as a component of an atomic nucleus.
  • Question 9/10
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    Which of the following is not a vector quantity?
    Solutions
    The speed of an object is the magnitude of its velocity. Speed is a scalar quantity.
    A vector is a physical quantity that has both a magnitude and a direction. These two quantities, the speed and direction of the car, (a magnitude and a direction) together form a vector we call velocity. Examples of scalar quantities: mass has only a value, no direction.
  • Question 10/10
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    Nuclear sizes are expressed in a unit named ____.
    Solutions
    Fermi is the unit of length equal to 10-15 meter used in nuclear physics. It is similar to the diameter of a proton.
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