Download CBSE Physics Guess Paper XI (11th) 2007
Guess Paper – 2007
Class – XI
Physics (set-1)
Syllabus :
Wave motion. Longitudinal and transverse waves, speed of wave motion. Displacement
relation for a progressive wave. Principle of superposition of waves, reflection of waves,
standing waves in strings and organ pipes, fundamental mode and harmonics, Beats,
Doppler effect.
WAVE MOTION
Q.1> Define Wave motion? What is the difference b/w transverse and longitudinal waves? Mention 2 examples of each.
Q.2> What was Newton’s formula for the speed of sound? Why was it incorrect? What was Laplace correction?
Q.3> Aluminum has a Young’s Modulus of 1012 Pa and a density of 2.7gm/cc. How long will sound take to travel across an aluminum rod of length 100m?
Q.4> Mention 4 factors, which affect the velocity of sound in air.
Q.5> The velocity of sound in air at 300K is 340m/s. Find the % change in the velocity of sound when temperature is raised to 400K.
Q.6> Briefly explain whether
(a) Velocity of sound is more or less on a rainy day
(b) Velocity of sound is more or less on a hot day
Q.7> The equation of a displacement is given by y = 10sin( ? x – ?/2 t + ?/6) m. What kind of motion does this represent? Mention its
(a) Amplitude (c) Time period (e) Velocity of wave
(b) Frequency (d) Wavelength (f) Wave number
Q.8> Draw the shape of the wave in the above question. What is the initial displacement of the particle at x = 0. Also find the initial velocity and initial acceleration of this particle. How is the particle velocity different from the wave velocity?
Q.9> A wave has a frequency of 1000Hz and a velocity of 2500m/s. The amplitude of the wave is 5cm and the initial position of the particle at x = 0 is 2.5cm. The wave is travelling from right to left. Find its equation?
Q.10> Mention 5 characteristics of wave motion.
Q.11> A string of mass 1kg has a length of 10m. A weight of 40kg is suspended from the string. If somehow transverse waves are setup on the string, find the time that they will take to travel across the string.
Q.12> Mention 4 applications of reflection of sound waves.
Q.13> What are standing waves. Mention 4 characteristics.
Q.14> What is superposition principle
Q.15> A wave given by y = Rsin( kx – ?t ) is travelling on a string. At the fixed end, the wave gets reflected. What is the equation of the reflected wave?
Q.16> In the above question, the incident and the reflected wave will superimpose and generate a standing wave pattern. Find the equation of this standing wave
Q.17> Standing waves are setup on a string of length L , mass M and tension T. Derive an expression for the frequency of the nth harmonic.
Q.18> Show the wave pattern of standing waves in the following cases
a.> String vibrating in fundamental mode and 2nd overtone
b.> Closed pipe in first harmonic and 3rd harmonic
c.> Open pipe in first harmonic and 2nd overtone
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