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Physics Test 127
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Physics Test 127

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  • Question 1/10
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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 2/10
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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 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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    We receive sunlight on earth surface. What type of light beams are these?
    Solutions

    • Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.

    • Sunlight takes about 8.3 minutes to reach Earth from the surface of the Sun.

    • If a beam is moving and its area is increasing, it is diverging and if it focus at one point, it is convergent.

    • So, Sunlight beams are diverging light beams, as they spread from a light source.

  • Question 5/10
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    A floating body always displaces liquid equals to its own:

    Solutions
    Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid.

    • If this net force is positive, the object rises; if negative, the object sinks; and if zero, the object is neutrally buoyant - that is, it remains in place without either rising or sinking. 

  • Question 6/10
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    Nuclear sizes are expressed in a unit named?
    Solutions
    The actual dimensions of the nucleus present in the atom are called nuclear size. It is measured in Fermi units. Nuclear sizes are expressed in a unit called "Fermi" which is a unit of length equal to 10−15 metre.
  • Question 7/10
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    The danger signals are red not yellow because

    Solutions

    This is because the scattering in red lights is less than that of yellow colour. The longest visible wavelength is red and the shortest is violet.

  • Question 8/10
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    Radian per second is the unit of which quantity?
    Solutions
    • The SI unit of angular velocity is radian per second.
    • The SI derived unit of frequency is the hertz (Hz).
    • Moment of inertia is expressed in units of kilogram metre square (kg. m2) in SI units.
    • SI Unit of momentum is in kilogram meters per second 
  • Question 9/10
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    Nib of a pen is split keeping in view the phenomenon of _____.
    Solutions
    • Capillarity is the result of surface or interfacial forces.

    • The rise of water in a thin tube inserted in water is caused by forces of attraction between the molecules of water and the glass walls and among the molecules of water themselves.
  • Question 10/10
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    The force acting between two electric charges is related with____.
    Solutions
    Coulomb's law is a law of physics describing the electrostatic interaction between electrically charged particles.
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