NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1839  1843 of 2184
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Question number: 1839
» Gravitation » Kepler's Laws of Planetary Motion
Question
The mean distance of mars from sun is 1.213 times the distance of the earth from the sun. The period of revolution of mars around sun will be
Choices
Choice (4)  Response  

a.  1.34 earth year 

b.  4.35 earth year 

c.  1.05 earth year 

d.  2.35 earth year 

Question number: 1840
» Gravitation » Gravitational Acceleration
Question
The potential energy of gravitational interaction of a point mass m and a thin uniform rod of mass M and length l, if they are located along a straight line at a distance a from each other is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Passage
A plate was cut from a quartz crystal and is used to control the frequency of an oscillating electrical circuit. Longitudinal standing waves are set up in the plate with displacement antinodes at opposite faces.
The fundamental frequency of vibration is given by the equation . Here s is thickness of the plate and density of quartz is 2658.76 kg/m ^{3}.
Question number: 1841 (1 of 2 Based on Passage) Show Passage
» Oscillations and Waves » Harmonics
Question
Young’s modulus of elasticity for quartz is 
Choices
Choice (4)  Response  

a.  2 ⨯ 10 ^{12} N/m ^{2} 

b.  Information insufficient 

c.  8.76 ⨯ 10 ^{12} N/m ^{2} 

d.  7 ⨯ 10 ^{11} N/m ^{2} 

Question number: 1842 (2 of 2 Based on Passage) Show Passage
» Oscillations and Waves » Harmonics
Question
If the quartz plate is vibrating in 3 ^{rd} harmonic while measuring the frequency of 1.2 ⨯ 10 ^{6} Hz, then the thickness of the plate is,
Choices
Choice (4)  Response  

a.  71.75cm 

b.  0.07 cm 

c.  7.175 cm 

d.  6.02 cm 

Question number: 1843
» Oscillations and Waves » Beats
Question
Two whistles A and B produce notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the midpoint of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener?
Choices
Choice (4)  Response  

a.  4 

b.  6 

c.  8 

d.  2 
