NEET Physics: Questions 1877  1881 of 2098
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Question number: 1877
» 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.  3.24 years 

d.  1.95 years 

Question number: 1878
» 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.  1100 

b.  800 

c.  900 

d.  1000 

Question number: 1879
» Gravitation » Orbital Velocity of a Satellite
Question
A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 5.8 ⨯ 10 ^{6} meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec ^{2})
Choices
Choice (4)  Response  

a.  7.5 km/sec, 8.0 minutes 

b.  2.7 km/sec, 8.51 minutes 

c.  7.75 km/sec, 80.51 minutes 

d.  7.5 km/sec, 80.51 minutes 

Question number: 1880
» Experimental Skills » Galvanometer
Question
A current of 5.5 A produces a deflection of 45° in the galvanometer. The figure of merit is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1881
» Gravitation » Orbital Velocity of a Satellite
Question
A satellite has to revolve round the earth in a circular orbit of radius 6 ⨯ 10 ^{3} km. The velocity of projection of the satellite in this orbit will be 
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

