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Physics Test 118
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Physics Test 118
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  • Question 1/10
    1 / -0.25
    What is the SI unit of electric current?
    Solutions
    SI unit of electric current is Ampere.Electric current is defined as the amount of charge that flows through a conductor in unit time. The SI unit of Charge is Coulomb and that of time is seconds and hence S.I. unit of electric current is Coulomb per second which is also called Ampere.
    Other Important SI units :
    Work Joule
    Energy Joule
    Force Newton
    Pressure Pascal or Newton/sq. metre Charge
    Frequency Hertz
    Power Watt
    Weight Newton or Kilogram
    Impulse Newton-second
    Angular velocity Radian /second
  • Question 2/10
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    Who among the following shared the 1903 Nobel Prize in Physics with Henri Becquerel for their discoveries in radioactivity?
    Solutions
    Pierre Curie shared Nobel Prize in Physics with his wife, Marie Curie, and Henri Becquerel for their discoveries in radioactivity in 1903.
  • Question 3/10
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    What is the SI unit of intensity of sound?
    Solutions
    The SI unit of intensity of sound is decibel. Intensity of sound is the power carried by sound waves per unit area in a perpendicular direction. The SI unit of sound intensity is watt per square meter also known as decibel.
  • Question 4/10
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    What is the value of the Least Distance of Distinct vision (in cm) for a normal human being?
    Solutions
    • 25 cm is the value of the Least Distance of Distinct vision for a normal human being. It is the minimum comfortable distance between the naked human eye and a visible object.
    • If a person is not able to see the object clearly from 25cm then he may be suffering either from myopia or Hypermetropia.
  • Question 5/10
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    At what temperature (in degree Celsius), the numerical values on Celsius and Fahrenheit scales become equal?
    Solutions
    It’s at the numerical value of -40, that the Celsius and the Fahrenheit scale overlaps. Explaining about the Celsius scale it involves that the water boils at 100 degree and its freezing point is 0, whereas for the Fahrenheit scale, boiling point is 212 degrees and the freezing point stands at 32 degrees. Moreover to convert Celsius scale to Fahrenheit, we can do it with the help of the formula- C*(9/5 +32).
  • Question 6/10
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    What is used as a reflector in the headlights of a vehicle?
    Solutions
    A Concave mirror is used for headlights of vehicles. When a lighted bulb is placed at the focus of a concave mirror, then the concave mirror collects all the diverging rays of the bulb and converts them into a powerful beam of light rays that can reach a large distance in the darkness of night and make us see things up to a considerable distance.
  • Question 7/10
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    When light passes from one medium to another, this phenomenon of change in its direction is called _____.
    Solutions
    Change in the direction of light due to the change in the medium of transmission is known as refraction. It so happens because the change in medium brings about the change in phase velocity, which involves change in the wavelength without the change in the frequency of the light particles, thus causing the alteration in the direction.
  • Question 8/10
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    If the speed of an object moving along a straight line is constant, its motion is said to be ___________.
    Solutions
    Uniform motion is defined as the motion of an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the length of the time. If a body is involved in rectilinear motion and the motion is uniform, then the acceleration of the body must be zero. The motion of a ball rolling down an inclined plane is an example of uniform motion.
  • Question 9/10
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    In microphone, the sound energy which changes into ……………..energy.
    Solutions
    Microphones are a type of transducer - a device which converts energy from one form to another.
    Microphones convert acoustical energy (sound waves) into electrical energy (the audio signal).
  • Question 10/10
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    Kelvin (K) is the unit of measurement of __________.
    Solutions
    Kelvin (K) is the unit of measurement of Temperature.
    ● The absolute zero of kelvin scale is the the temperature at which all thermal motion ceases in the classical description of thermodynamics.
    ● When compared to other units of temperature measurement, 0 K is equivalent to −273.15 °C or −459.67 °F.
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