NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1876  1879 of 2320
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Question number: 1876
» Gravitation » Energy
Question
Two satellites P and Q of same mass are revolving near the earth surface in the equatorial plane. The satellite P moves in the direction of rotation of earth whereas Q moves in the opposite direction. The ratio of their kinetic energies with respect to a frame attached to earth will be –
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 1877
» Gravitation » Gravitational Potential
Question
Two satellites S _{1} and S _{2} revolve round a planet in the same direction in circular orbits. Their periods of revolutions are 1 hour and 6 hour respectively. The radius of S _{1} is 1.5 ⨯ 10 ^{5} km. The velocity of S _{2} with respect to S _{1} will be
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 1878
» Gravitation » Kepler's Laws of Planetary Motion
Question
The semimajor axes of the orbits of mercury and mars are respectively 0.387 and 1.524 in astronomical unit. If the period of Mercury is 0.222 year, what is the period of Mars?
Choices
Choice (4)  Response  

a.  1.73 years  
b.  1.23 years  
c.  1.95 years  
d.  3.24 years 
Question number: 1879
» Oscillations and Waves » Doppler Effect in Sound
Question
The speed of sound in air at a given temperature is 250 m/s. An engine blows whistle at a frequency of 810 cps. It is approaching the observer with velocity 25 m/s. The apparent frequency in cps heard by the observer will be
Choices
Choice (4)  Response  

a.  900  
b.  1100  
c.  1000  
d.  800 