Physics
Grade-9
Easy
Question
Sound waves are:
- Longitudinal
- Transverse
- Partly longitudinal, partly transverse
- Sometimes longitudinal, sometimes transverse.
Hint:
Longitudinal waves are made of compressions and rarefactions hence sound wave is a longitudinal wave
The correct answer is: Longitudinal
The sound waves are longitudinal because it travels using compressions and rarefactions. The air particles vibrate parallel to the direction of propagation.
Related Questions to study
Physics
Transverse waves have ________.
Transverse waves have ________.
PhysicsGrade-9
Physics
Choose the correct statements:
Assertion: Sine and cosine functions are periodic functions.
Reason: Sinusoidal functions repeat their values after a definite interval of time.
Choose the correct statements:
Assertion: Sine and cosine functions are periodic functions.
Reason: Sinusoidal functions repeat their values after a definite interval of time.
PhysicsGrade-9
Physics
A 20 g particle moves in SHM with a frequency of 3 oscillations per second and an amplitude of 5 cm. The total distance does the particle move during one oscillation is:
A 20 g particle moves in SHM with a frequency of 3 oscillations per second and an amplitude of 5 cm. The total distance does the particle move during one oscillation is:
PhysicsGrade-9
Physics
If a body is executing simple harmonic motion, then:
If a body is executing simple harmonic motion, then:
PhysicsGrade-9
Physics
Two simple pendulums of lengths 5 m and 20 m respectively are given small linear displacement in one direction at the same time. They will again be in the phase when the pendulum of shorter length has completed .... oscillations.
Two simple pendulums of lengths 5 m and 20 m respectively are given small linear displacement in one direction at the same time. They will again be in the phase when the pendulum of shorter length has completed .... oscillations.
PhysicsGrade-9
Physics
There are _______ complete oscillations are shown in the graph below.
There are _______ complete oscillations are shown in the graph below.
PhysicsGrade-9
Physics
Select the correct statement(s) from the following:
I. Motion of a satellite and a planet is periodic as well as SHM.
II. Mass suspended by a spring executes SHM.
III. Motion of a simple pendulum is always SHM.
Select the correct statement(s) from the following:
I. Motion of a satellite and a planet is periodic as well as SHM.
II. Mass suspended by a spring executes SHM.
III. Motion of a simple pendulum is always SHM.
PhysicsGrade-9
Physics
Which of the following statements is not correct for a particle executing simple harmonic motion?
Which of the following statements is not correct for a particle executing simple harmonic motion?
PhysicsGrade-9
Physics
The periodic time of a body executing simple harmonic motion is 3 sec. After how many intervals from time t = 0, its displacement will be half of its amplitude:
The periodic time of a body executing simple harmonic motion is 3 sec. After how many intervals from time t = 0, its displacement will be half of its amplitude:
PhysicsGrade-9
Physics
Force acting in simple harmonic motion is always:
Force acting in simple harmonic motion is always:
PhysicsGrade-9
Physics
Choose the correct statement from the following:
Assertion: In oscillatory motion, displacement of a body from equilibrium can be represented by sine or cosine function.
Reason: The body oscillates to and from about its mean position.
Choose the correct statement from the following:
Assertion: In oscillatory motion, displacement of a body from equilibrium can be represented by sine or cosine function.
Reason: The body oscillates to and from about its mean position.
PhysicsGrade-9
Physics
The displacement time graph of a particle executing S.H.M. is as shown in the figure:
The corresponding force-time graph will be:
The displacement time graph of a particle executing S.H.M. is as shown in the figure:
The corresponding force-time graph will be:
PhysicsGrade-9
Physics
Assertion: All small oscillations are simple harmonic.
Reason: Oscillations of a simple pendulum system are always simple harmonic whether the amplitude is small or large.
Assertion: All small oscillations are simple harmonic.
Reason: Oscillations of a simple pendulum system are always simple harmonic whether the amplitude is small or large.
PhysicsGrade-9
Physics
Two simple pendulums of length 1 m and 16 m respectively are given small displacements at the same time in the same direction. The number of oscillations ‘N’ of the smaller pendulum for them to be in phase again is:
Two simple pendulums of length 1 m and 16 m respectively are given small displacements at the same time in the same direction. The number of oscillations ‘N’ of the smaller pendulum for them to be in phase again is:
PhysicsGrade-9
Physics
Select the true statement(s) about SHM.
I. Acceleration display style alpha displacement is a sufficient condition for SHM.
II. Restoring force display style alpha displacement is a sufficient condition for SHM.
Select the true statement(s) about SHM.
I. Acceleration display style alpha displacement is a sufficient condition for SHM.
II. Restoring force display style alpha displacement is a sufficient condition for SHM.
PhysicsGrade-9
