NEET UG Physics Oscillations and Waves MCQs with answers available in Pdf for free download. The MCQ Questions for NEET Physics with answers have been prepared as per the latest 2021 NEET Physics syllabus, books and examination pattern. Multiple Choice Questions form important part of competitive exams and NEET exam and if practiced properly can help you to get higher rank. Refer to more topic wise NEET Physics Questions and also download more latest study material for all subjects and do free NEET Physics Mock Test

**SECTION : II**

**Assertion – Reason type questions :**

**Note:**

**For the following questions, statement as well as the reason(s) are given. Each questions has four options.**

**Select the correct option.**

**69. Statement – 1 : If a spring having spring constant k is divided into equal parts, then the spring constant of each part will be 2k.**

**NOTE: Questions 85 to 90 are based on the following passage.**

**Passage – 3:**

**The equation for displacement of a particle at time t is given by the equation y = 3Cos2t + 4Sin2t. .**

**85. The motion of the particle is ____**

**86. The periodic time of oscillation is ____**

**87. The amplitude of oscillation is ____ cm**

**88. The maximum acceleration of the particle is _____ cm / s**

^{2}.**89. If the mass of the particle is 5 gm, then the total energy of the particle is ______ erg.**

**90. The frequency of the particle is ____ s**

^{-1}.**114. Twenty four tuning forks are arranged in such a way that each fork produces 6 beats/s with the preceding fork. If the frequency of the last tuning fork is double than the first fork, then the frequency of the second tuning fork is ____**

**115. If two SHM’s are given by the equation y**

_{1}= 0.1 Sin(100pt + p/3) and y_{2}= 0.1 Cospt, then the**phase difference between the velocity of particle 1 and 2 is ____**

**116. The wave number for a wave having wavelength 0.005 m is __ m**

^{ –1}.**117. An listener is moving towards a stationary source of sound with a speed ¼ times the speed of sound.**

**What will be the percentage increase in the frequency of sound heard by the listener?**

**118. When the resonance tube experiment, to measure speed of sound is performed in winter, the first**

**harmonic is obtained for 16 cm length of air column. If the same experiment is performed in summer,**

**the second harmonic is obtained for x length of air column. Then ___**

**119. What should be the speed of a source of sound moving towards a stationary listener, so that the**

**frequency of sound heard by the listener is double the frequency of sound produced by the source?**

**{ Speed of sound wave is v }**

**120. A metal wire having linear mass density 10 g/m is passed over two supports separated by a distance**

**of 1 m. The wire is kept in tension by suspending a 10 kg mass. The mid point of the wire passes**

**through a magnetic field provided by magnets and an a.c. supply having frequency n is passed**

**through the wire. If the wire starts vibrating with its resonant frequency, what is the frequency of a.c.**

**supply?**

**124. A wave travelling along a string is described by y = 0.005Sin(40x – 2t) in SI units. The wavelength and frequency of the wave are _____**

**125. Two sitar strings A and B playing the note “Dha” are slightly out of time and produce beats of frequency 5 hz. The tension of the string B is slightly increased and the beat frequency is found to decrease to 3 hz. What is the original frequency of B if the frequency of A is 427 hz?**

**126. A rocket is moving at a speed of 130 m/s towards a stationary target. While moving, it emits a wave of frequency 800 hz. Calculate the frequency of the sound as detected by the target. ( Speed of wave = 330 m/s)**

**127. Length of a steel wire is 11 m and its mass is 2.2 kg. What should be the tension in the wire so that the speed of a transverse wave in it is equal to the speed of sound in dry air at 20° C temperature?**

^{4}N (B) 2.25 x 10

^{4}N (C) 2.06 x 10

^{4}N (D) 2.56 x 10

^{4}N

**128. A wire stretched between two rigid supports vibrates with a frequency of 45 hz. If the mass of the**

**wire is 3.5 x 10**

^{–2}kg and its linear mass density is 4.0 x 10^{- 2}kg/m, what will be the tension in the**wire ?**

**129. Tube A has both ends open while tube B has one end closed, otherwise they are identical. The ratio**

**of fundamental frequency of tube A and B is ____**

**130. A tuning fork arrangement produces 4 beats/second with one fork of frequency 288 hz. A little wax**

**is applied on the unknown fork and it then produces 2 beats/s. The frequency of the unknown fork**

**is _____ hz.**

**131. A wave y = aSin(ùt – kx ) on a string meets with another wave producing a node at x = 0. Then**

**the equation of the unknown wave is _____**

**132. When temperature increases, the frequency of a tuning fork _____**

**133. A tuning fork of known frequency 256 hz makes 5 beats per second with the vibrating string of a**

**piano. The beats frequency decreases to 2 beats/s when the tension in the piano string is slightly**

**increased. The frequency of the piano string before increase in the tension was ____ hz.**

**134. An observer moves towards a stationary source of sound with a velocity one – fifth the velocity of**

**sound. What is the percentage increase in the apparent frequency?**

**135. The speed of sound in Oxygen ( O**

_{2}) at a certain temperature is 460 m/s. The speed of sound in**helium at the same temperature will be _____ ms**

^{- 1}. (Assume both gases to be ideal)**136. In a longitudinal wave, pressure variation and displacement variation are………**

**137. A tuning fork of frequency 480 hz produces 10 beats/s when sounded with a vibrating sonometer**

**string. What must have been the frequency of the string if a slight increase in tension produces fewer**

**beats per second than before?**

**140. A string of linear density 0.2 kg/m is stretched with a force of 500 N. A transverse wave of length**

**4.0 m and amplitude 1/l meter is travelling along the string. The speed of the wave is ___m/s.**

**141. Two wires made up of same material are of equal lengths but their radii are in the ratio 1:2. On**

**stretching each of these two strings by the same tension, the ratio between their fundamental frequency**

**is ____**

**142. The tension in a wire is decreased by 19%, then the percentage decrease in frequency will be ____**

**143. An open organ pipe has fundamental frequency 100 hz. What frequency will be produced if its one**

**end is closed?**

**144. A closed organ pipe has fundamental frequency 100 hz. What frequencies will be produced if its**

**other end is also opened?**

**145. A column of air of length 50 cm resonates with a stretched string of length 40 cm. The length of the same air column which will resonate with 60 cm of the same string at the same tension is ____**

**146. Two forks A and B when sounded together produce 4 beats/s. The fork A is in unison with 30 cm**

**length of a sonometer wire and B is in unison with 25 cm length of the same wire at the same tension.**

**The frequencies of the fork are ____**

**147. A tuning fork of frequency 200 hz is in unison with a sonometer wire. The number of beats heard per**

**second when the tension is increased by 1 % is ___**

**148. A bus is moving with a velocity of 5 m/s towards a huge wall. The driver sounds a horn of frequency**

**165 hz. If the speed of sound in air is 335 m/s, the number of beats heard per second by the**

**passengers in the bus will be ____**

**149. A vehicle with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular**

**to the straight line joining the observer and the vehicle. The observer perceives the sound to have a**

**frequency ( n + n**

_{1}). If the sound velocity in air is 300 m/s, then ____{1}= 10n (B) n

_{1}= 0 (C) n

_{1}= 0.1 n (D) n

_{1}= - 0.1n

**157. A cylindrical tube open at both ends has a fundamental frequency f in air. The tube is dipped vertically**

**in water so that half of it is in water. The fundamental frequency of the air column is now ____**

**158. Three sound waves of equal amplitudes have frequencies (v-1 ), v, ( v+1). They superpose to give**

**beats. The number of beats produced per second will be ____**

**159. A wave travelling along the x-axis is described by the equation y(x,t) = 0.005Cos(áx - ât). If the**

**wavelength and the time period of the wave are 0.08 m and 2.0 s respectively, then á and â in**

**appropriate units are _____**

**160. A wave travelling along a string is described by the equation y = ASin(ùt-kx). The maximum particle velocity is _____**

**161. A string is stretched between fixed points seperated by 75 cm. It is observed to have a resonant frequencies of 420 hz and 315 hz. There are other resonant frequencies between these two. Then the lowest frequency for this string is ____ hz.**

**162. Two tuning forks P and Q when set vibrating gives 4 beats/second. If the prong of fork P is filed, the**

**beats are reduced to 2/s. What is the frequency of P, if that of Q is 250 hz.?**

**163. The length of a string tied across two rigid supports is 40 cm. The maximum wavelength of a stationary**

**wave that can be produced in it is ____ cm.**

**164. A stationary wave of frequency 200 hz are formed in air. If the velocity of the wave is 360 m/s, the**

**shortest distance between two antinodes is ____ m**

**165. A tuning fork produces 8 beats per second with both 80 cm and 70 cm of stretched wire of a**

**sonometer. Frequency of the fork is ___ hz.**

**166. An open pipe is in resonance in 2**

^{nd}harmonic with frequency f_{1}. Now one end of the tube is closed**and frequency is increased to f**

_{2}, such that the resonance again occurs in the nth harmonic. Choose**the correct option.**

_{2}= (3/4)f

_{1}(B) n = 3, f

_{2}= (5/4)f

_{1}(C) n = 5, f

_{2}= (5/4)f

_{1}(D) n = 5, f

_{2}= (3/4)f

_{1}

**SECTION : II**

**Assertion – Reason type questions :**

**Note:**

**For the following questions, statement as well as the reason(s) are given. Each questions has four options.**

**Select the correct option.**

**(a) Statement – 1 is true, statement- 2 is true; statement-2 is the correct explanation of statement – 1 .**

**(b) Statement – 1 is true, statement- 2 is true but statement-2 is not the correct explanation of statement – 1 .**

**(c) Statement – 1 is true, statement- 2 is false**

**(d) Statement – 1 is false, statement- 2 is true**

**167.**Statement – 1: Two waves moving in a uniform string having uniform tension cannot have different velocities.

**168.**Statement – 1: When a sound source moves towards observer, then frequency of sound increases.

**169.**Statement – 1: Newton’s equation for speed of sound was found wrong because he assumed the process to be isothermal.

**SECTION – III**

**COMPREHENSION BASED QUESTIONS**

**NOTE: Questions 172 to 174 are based on the following passage.**

**Passage – 1**

**172. The frequency of the fundamental mode of the closed pipe is ____ hz**

**173. The frequency of the string vibrating in its 1st overtone is ___ hz**

**174. The tension in the string is very nearly equal to ____**

**NOTE: Questions 175 to 178 are based on the following passage.**

**Passage – 2**

_{1}= 0.05Sin(3pt – 2x) and y

_{2}= 0.05Sin(3pt + 2x) where x and y are in meters and t is in seconds.

**175. The speed ( in ms**

^{–1}) of each wave is ____**176. The distance ( in meters ) between two consecutive nodes is ____**

**177. The amplitude of a particle at x = 0.5 m is ____**

^{–1}m (B) 5.4 x 10

^{–2}m (C) (p/2) x 10

^{–1}m (D) p x 10

^{–1}m

**178. The velocity ( in ms**

^{–1}) of a particle at x = 0.25 m at t = 0.5 s is ___**177. The amplitude of a particle at x = 0.5 m is ___**

^{–1}m (B) 5.4 x 10

^{–2}m (C) (p/2) x 10

^{–1}m (D) p x 10

^{–1}m

**178. The velocity ( in ms**

^{–1}) of a particle at x = 0.25 m at t = 0.5 s is ___**NOTE: Questions 179 to 181 are based on the following passage.**

**Passage – 3**

**When two sound waves travel in the same direction in a medium, the displacement of a particle located at x at time t is given by y**

_{1}= 0.05Cos(0.50px - 100pt ) & y_{2}= 0.05Cos ( 0.46px - 92pt ), where y_{1}, y_{2}and x are in meter and t is in seconds.**179. What is the speed of sound in the medium?**

**180. How many times per second does an observer hear the sound of maximum intensity?**

**181. At x = 0, how many times between t = 0 and t = 1 s does the resultant displacement become zero?**

**NOTE: Questions 182 to 183 are based on the following passage.**

**Passage – 4**

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