Oscillations and Waves (NEET Physics): Questions 120  123 of 192
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Question number: 120
» Oscillations and Waves » Simple Pendulum
Question
A simple pendulum is executing simple harmonic motion with a time period . If the length of the pendulum is increased by 21%, the percentage increase in the time period of the pendulum of is,
Choices
Choice (4)  Response  

a.  10% 

b.  21% 

c.  30% 

d.  50% 

Question number: 121
» Oscillations and Waves » Simple Pendulum
Question
Identify wrong statements among the following,
(1) The greater the mass of a pendulum bob, the shorter is its frequency of oscillation
(2) A simple pendulum with a bob of mass m swings with an angular amplitude of 40°. When its angular amplitude is 20°, the tension in the string is less than mg cos 20 ^{0}.
(3) As the length of a simple pendulum is increased, the maximum velocity of its bob during its oscillation will also increase.
(4) The fractional change in the time period of a pendulum on changing the temperature is independent of the length of the pendulum.
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  2 and 4 are correct 

b.  1 and 2 are correct 

c.  1, 2 and 3 are correct 

d.  1 and 3 are correct 

Question number: 122
» Oscillations and Waves » Wave Motion
Question
A tuning fork makes 125 vibrations per second in air. When the velocity of sound is 330 m/s then wavelength of the tone emitted is
Choices
Choice (4)  Response  

a.  2.56 m 

b.  2.29 m 

c.  1.89 m 

d.  2.64 m 

Question number: 123
» Oscillations and Waves » Simple Harmonic Motion » Oscillations of a Spring
Question
A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then the short piece will have a force constant of
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

