Balaji Physics Class 11. We covered all the Balaji Physics Class 11 MCQs in this post for free so that you can practice well for the exam.
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Balaji Physics Class 11 Objective for Students
Due to which phenomena is sound heard at a longer distance at night than during the day?
(a) Reflection
(b) Refraction
(c) Interference of sound
(d) Diffraction of sound
Option b – Refraction
A person rings a metallic bell near a strong concrete wall. He hears the echo after 0.3 s. If the sound moves with a speed of 340 m/s, how far is the wall from him?
(a) 102 m
(b) 11 m
(c) 51 m
(d) 30 m
Option c – 51 m
An echo is heard after 5 s of the production of sound, which moves with a speed of 340 m/s. What is the distance of the mountain from the source of sound that produced the echo?
(a) 0.085 km
(b) 0.85 km
(c) 0.17 km
(d) 1.7 km
Option c – 0.85 km
The full form of SONAR is
(a) Sonographic Navigation And Radiation
(b) Sound Navigation And Ranging
(c) Sonographic Navigation Around Radiation
(d) Sonographic Navigation and Auto Ranging
Option b – Sound Navigation And Ranging
SONAR is based on the principle of
(a) resonance
(b) reverberation
(c) echo
(d) None of the above
Option c – echo
Which one of the following statement(s) is/are not correct?
(a) The response of the ear to the sound of increasing intensity is approximately logarithmic.
(b) The sensitivity of the human ear does not vary with the frequency of the sound.
(c) When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave.
(d) Longitudinal waves can travel in all media; solids, liquids, and gases.
Option b – The sensitivity of the human ear does not vary with the frequency of the sound
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