NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 285  289 of 2320
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Question number: 285
» Communication System » Need for Modulation
Question
The acceleration due to gravity at a place can be determined with the help of a simple pendulum. For this purpose effective length of the pendulum is considered. If ′ ′ be the length of the string and ‘d’ the diameter of the bob then the effective length is equal to
Choices
Choice (4)  Response  

a. 
 
b. 
 
c.  l + d  
d.  ld 
Passage
Capacitor C _{3} in the circuit is variable capacitor (its capacitance can be varied). Graph is plotted between potential differences V, (across capacitor C _{1}) versus C _{3}, Electric potential V _{1} approaches on asymptote of 10 volts as C _{3} → ∞
Question number: 286 (1 of 3 Based on Passage) Show Passage
Question
The ratio of energy stored in capacitor C _{1} to that of total energy when C _{3} → ∞ is
Choices
Choice (4)  Response  

a. 
 
b.  Zero  
c.  Data insufficient  
d.  1 
Question number: 287 (2 of 3 Based on Passage) Show Passage
Question
The ratio of the capacitance C1/C2 will be
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 288 (3 of 3 Based on Passage) Show Passage
Question
The value of C _{3} for which potential difference across C _{1} will become 8V, is
Choices
Choice (4)  Response  

a.  2.5 C _{1}  
b.  1.5 C _{1}  
c.  3.5 C _{1}  
d.  4.5 C _{1} 
Question number: 289
» Kinematics » Uniform and NonUniform Motion
Question
An engine of mass 6 x 10 ^{4} kg pulls a coach of mass 2 x 10 ^{4} kg. Suppose that there is a resistance of 1 N per 100 kg acting on both coach and engine, and that the driving
Force of engine is 4800 N. The acceleration of the engine and tension in the coupling will respectively be
Choices
Choice (4)  Response  

a.  0.04 m/s ^{2}, 20 N  
b.  0.05 m/s ^{2}, 1200 N  
c.  400 m/s ^{2}, 200 N  
d.  0.09 m/s ^{2}, 2000 N 