Class 11 Physics MCQ
Test your knowledge with important Class 11 Physics MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Class 11 Physics MCQs on Bissoy. Bissoy App
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A man is moving towards a wall with a source of sound in his hand. Frequency of source = 50Hz. Speed of man = 8m/s. If the man sends one pulse of sound, what will be the frequency heard by him after sound reflects off the wall? Speed of sound = 330m/s.
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If both the source of sound and observer are moving, the apparent frequency will be different from the actual frequency. True or False?
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A man jumps from a building with a source of sound. When he reaches halfway down, he starts the siren of frequency 100Hz. A person standing below him on the ground hears the first sound to be of frequency 120Hz. What is the height of the building? Speed of sound = 330m/s. Take g=9.81m/s2.
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A source of frequency 50Hz is moving towards an observer with a deceleration of 2m/s2. If its initial speed is 20m/s, what will be the maximum frequency heard by the observer? Initial distance between source and observer is 100m. Speed of sound = 330m/s.
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A source moves towards a stationary observer with a speed of 10m/s. If the frequency of the source is 10Hz what will be the wavelength of sound heard by the observer? Speed of sound = 330m/s.
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A source of sound moves towards an observer. What happens to the speed of sound in the medium?
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A train with a frequency ‘f’. What will be the frequency heard by a person sitting in the train? Speed of the train is ‘v’.
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An observer is standing stationary in air moving at a speed of 2m/s. A source of frequency 20Hz is moving in the direction of wind with speed 10m/s towards the observer. What will be the frequency as heard by the observer? Speed of sound in air is 330m/s.
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In case of electromagnetic waves, doppler shifts are independent of whether source moves or observer provided relative speed is the same. True or False?
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Two longitudinal waves: s1 = 3cos(11t) & s2 = 3cos(10t) interfere. What is the amplitude of the resulting wave?
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Let’s say we can hear a beat frequency of 2Hz from two tuning forks. The first tuning fork has a frequency of 100Hz. If wax is applied on the 2nd tuning fork, the beat frequency becomes 4Hz, what is the frequency of the 2nd tuning fork?
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Two interfering waves have a frequency of 2Hz & 6Hz. What is the beat frequency?
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Consider the phenomenon of beats & select the correct statement.
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Standing waves can be produced when two identical waves, having a phase difference of π, are travelling in the same direction. True or False?
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A pipe open at both ends has a fundamental frequency of 2Hz. If the pipe is closed at one end and half filled with water, what will be the fundamental frequency?
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Consider standing waves in an air column with one end closed. What is a pressure node?
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A pipe is open at both ends. What should be its length such that it resonates a 10Hz source in the 2nd harmonic? Speed of sound in air = 340m/s.
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Consider the case of normal modes of vibration for the air column with only one end closed. What is the length of the air column for the fundamental harmonic?
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If a standing wave is vibrating in the fourth harmonic and the wavelength is λ, what is the length of the string.
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What is the minimum distance between a node & an antinode in a standing wave?
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In a standing wave the amplitude of a particle is fixed, but varies from particle to particle. True or False?
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The equation of a wave is: y = 2sin(4x-3t). What will be the equation of the reflected wave from a free surface?
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If a string wave encounters a completely fixed end, what happens to its phase?
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In superposition of waves the displacements get added like vectors. True or False?
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A wave having an amplitude of 3cm is to be superimposed with another wave of the same amplitude. What should be their phase difference if the net amplitude has to be 0?
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y1 = 2sin(3x – 2t) & y2 = 3sin(3x – 2t + π/4). Find the expression for resultant displacement caused by superposition of the two waves.
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Laplace correction makes use of which of the following processes?
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What is the ratio of speed of sound in air when measured after laplace correction to that measured by Newton’s formula?
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The speed of sound in air is 330m/s. What is the mass of 1 mole of air? Assume it is an ideal gas.
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The formula v = √(P/ρ) can be used for any gas considering isothermal process. True or False?