QUIZ 1: Waves(#Free Test Series) - JEE MCQ

 A stone is hung in air from a wire which is stretched over a sonometer. The bridges of the sonometer are L cm apart when the wire is in unison with a tuning fork of frequency N. When the stone is completely immersed in water, the length between the bridges is ℓ cm for re-establishing unison, the specific gravity of the material of the stone is

Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be 

 A source of sound of frequency f₁ is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f(Hz) is plotted against time t(sec). The speed of sound in air is 300 m/s. Find f₁(g=10m/s2) 

 When beats are produced by two progressive waves of nearly the same frequency, which one of the following is correct?

 Which of the following statements is correct for stationary waves?

 A string is under tension so that its length is increased by 1/n times its original length. The ratio of fundamental frequency of longitudinal vibrations and transverse vibrations will be

 A closed organ pipe and an open organ pipe of same length produce 2 beats when they are set into vibration simultaneously in their fundamental mode. The length of the open organ pipe is now halved and of the closed organ pipe is doubled; the number of beats produced will be

 The linear density of a vibrating string is10-4 kg/m. A transverse wave is propagating on the string, which is described by the equationy=0.02sin(x+30t), where x andy are in metres and time t in seconds. Then tension in the string is

 In sports meet the timing of a 200 m straight dash is recorded at the finish point by starting an accurate stop watch on hearing the sound of starting gun fired at the starting point. The time recorded will be more accurate

 A tuning fork produces 4 beats per second with another fork of frequency 288 cps. A little wax is placed on the unknown fork and it then produces 2 beats per second. The unknown frequency is

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

 While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, he measures the column length to be x centimeter for the second resonance. Then