NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1925  1930 of 2142
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Question number: 1925
» Oscillations and Waves » Standing Waves in Strings and Organ Pipes
Question
A closed organ pipe of length L and an open organ pipe contain gases of densities ρ _{1}, and ρ _{2} respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open organ pipe is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1926
» Communication System » Amplitude and Frequency Modulation
Question
In an amplitude modulated wave for audio frequency of 1000 cycle/second, the appropriate carrier frequency will be,
Choices
Choice (4)  Response  

a.  100 cycles/sec 

b.  10 cycles/sec 

c.  1000 cycles/sec 

d.  10000 cycles/sec 

Question number: 1927
» Oscillations and Waves » Doppler Effect in Sound
Question
An observer is moving away from source of sound of frequency 100 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the observed frequency is
Choices
Choice (4)  Response  

a.  90 Hz 

b.  91 Hz 

c.  100 Hz 

d.  110 Hz 

Question number: 1928
» Gravitation » Universal Law of Gravitation
Question
Gravitational mass is proportional to,
Choices
Choice (4)  Response  

a.  Gravitational field 

b.  Gravitational force 

c.  Gravitational intensity 

d.  Question does not provide sufficient data or is vague 

Question number: 1929
» Oscillations and Waves » Doppler Effect in Sound
Question
A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer in Hz is
Choices
Choice (4)  Response  

a.  409 

b.  517 

c.  429 

d.  500 

Question number: 1930
» Gravitation » GeoStationary Satellites
Question
If the moon revolves round the earth 10 times in one year. If the ratio of sunearth distance to earthmoon distance is 393, then the ratio of masses of sun and earth will be –
Choices
Choice (4)  Response  

a.  6.07 ⨯ 10 ^{5} 

b.  4.56 ⨯ 10 ^{5} 

c.  1 

d.  5.93 ⨯ 10 ^{5} 
