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Practice MCQ Questions and answers on Physics-GK

Learn and practice General Knowledge questions and answers on Physics with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-4 section-3

Each section contains 100 MCQs on Physics .
31
The unit of noise pollution (level) is :
Discuss
Answer & Solution
Answer: Option A
Solution:
Loudness (also called sound pressure level, or SPL) is measured in logarithmic units called decibels (dB).
32
The speed of sound travel fastest through
Discuss
Answer & Solution
Answer: Option B
Solution:
Of the three phases of matter (gas, liquid, and solid), sound waves travel the slowest through gases, faster through liquids, and fastest through solids.
33
Compressions and Rarefactions are characteristic of
Discuss
Answer & Solution
Answer: Option A
Solution:
Compressions and Rarefactions are characteristic of longitudinal waves.
34
Least audible sound for most of the human ear is :
Discuss
Answer & Solution
Answer: Option B
Solution:
Least audible sound for most of the human ear is 0.0002 µ bar.
35
Hertz is a unit for measuring
Discuss
Answer & Solution
Answer: Option B
Solution:
Frequency is the rate at which current changes direction per second. It is measured in hertz (Hz), an international unit of measure where 1 hertz is equal to 1 cycle per second.
36
Hertz is the SI unit of
Discuss
Answer & Solution
Answer: Option D
Solution:
Hertz is the SI unit of frequency.
37
The velocity of the sound is highest in
Discuss
Answer & Solution
Answer: Option A
Solution:
The velocity of the sound is highest in metal.
38
The ordinary and maximum tolerance limit of sound by human being is
Discuss
Answer & Solution
Answer: Option B
Solution:
The ordinary and maximum tolerance limit of sound by human being is 60 db to 80 db (decibel).
39
In SONAR which kind of wave is used?
Discuss
Answer & Solution
Answer: Option B
Solution:
In SONAR ultrasonic wave is used.
40
Sound waves cannot travel through
Discuss
Answer & Solution
Answer: Option C
Solution:
Sound waves cannot travel through vacuum.