# GK Questions: General Science(Physics) – Set 2

Hello Aspirants. Welcome to Online General Knowledge section in Affairs cloud, which is important for all the competitive exams. We have created Some questions related to General Science(Physics) !!!

1. The Unit of sound is ………………..
1.Intensity
2.Hertz
3.Decibel
4.Frequency
5.None of these
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 –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
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 –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 –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 – 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
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
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
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 – 4.Ultrasonic waves
Explanation :
Ultrasonic waves – greater than 20000Hz
Human ears can’t detect theses waves

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