GK Questions: General Science(Physics) – Set 2

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1. The Unit of sound is ………………..
   1.Intensity
   2.Hertz
   3.Decibel
   4.Frequency
   5.None of these
   
   Answer & Explanation

   Answer –3.Decibel
   Explanation :
   Decibel(dB), unit for expressing the ratio between two amounts of electric or acoustic power or for measuring the relative loudness of sounds.
   1 dB = 20 times the common logarithm of the ratio.
   
   
   
2. The sound waves or audible waves are lies in the range of ………………………
   1.less than 20Hz
   2.20Hz to 20000Hz
   3.Greater than 20000Hz
   4.20000Hz
   5.None of these
   
   Answer & Explanation

   Answer –2.20Hz to 20000Hz
   Explanation :
   Sound waves or audible waves – 20Hz to 20000Hz
   These waves sensitive to human ear
   
   
   
3. Speed of sound is …………………….. in solids and …………………… in gases
   1.Minimum, Maximum
   2.Minimum, Minimum
   3.Maximum, Maximum
   4.Maximum, Minimum
   5.None of these
   
   Answer & Explanation

   Answer –4.Maximum, Minimum
   Explanation :Speed of sound is maximum in solids and minimum in gases
   
   
   
4. The infrasonic waves have the frequencies
   1.less than 20Hz
   2.20Hz to 20000Hz
   3.Greater than 20000Hz
   4.20000Hz
   5.None of these
   
   Answer & Explanation

   Answer –1.less than 20Hz
   Explanation :
   Infrasonic waves – less than 20Hz
   These waves are produced by earth quakes
   
   
   
5. The wavelength range of electromagnetic wave is ……………………………
   1.10^-3 to 10⁴ m
   2.10^-1 to 10² m
   3.10^-2 to 10³ m
   4.10^-4 to 10⁴ m
   5.None of these
   
   Answer & Explanation

   Answer –4. 10^-4 to 10⁴ m
   Explanation :
   Ex of electromagnetic wave – Alpha rays, Gamma rays
   
   
   
6. Frequency is defined as
   1.The maximum time period
   2.Maximum displacement from mean position
   3.Time taken for 1 oscillation
   4.The no of oscillations in 1 seconds
   5.None of these
   
   Answer & Explanation

   Answer – 4.The no of oscillations in 1 seconds
   Explanation :
   Frequency is defined as the no of oscillations in 1 seconds
   Frequency Unit – Hertz
   F=1/T
   
   
   
7. The echo is not heared at the …………. due to absence of atmosphere
   1.Moon
   2.Earth
   3.Mountains
   4.Ocean
   5.None of these
   
   Answer & Explanation

   Answer –1.Moon
   Explanation :
   The sound waves received after being reflected from some other place is called echo.
   The minimum distance between the observer and reflector should be 17m.
   
   
   
8. ………….. waves are always characterized by particle motion being perpendicular to wave motion.
   1.Longitudinal
   2.Transverse
   3.Mechanical
   4.Electromagnetic waves
   5.None of these
   
   Answer & Explanation

   Answer –2.Transverse
   Explanation :
   Transverse waves are always characterized by particle motion being perpendicular to wave motion.
   Ex – Waves on string under  tension or under surface water
   
   
   
9. The distance between consecutive trough or compression is known as
   1.Amplitude
   2.Frequency
   3.Wavelength
   4.Time period
   5.None of these
   
   Answer & Explanation

   Answer –3.Wavelength
   Explanation :
   Distance between consecutive trough or compression is known as Wavelength
   Wavelength( λ) Unit – meter
   
   
   
10. The longitudinal waves having frequency greater than 20000Hz are called
    1.Electromagnetic waves
    2.Sound Waves
    3.Audible waves
    4.Ultrasonic waves
    5.None of these
    
    Answer & Explanation

    Answer – 4.Ultrasonic waves
    Explanation :
    Ultrasonic waves – greater than 20000Hz
    Human ears can’t detect theses waves