NEET Physics: Questions 287  291 of 2142
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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: 287 (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.  4.5 C _{1} 

b.  1.5 C _{1} 

c.  2.5 C _{1} 

d.  3.5 C _{1} 

Question number: 288
» 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 

Question number: 289
» Laws of Motion » Force and Inertia
Question
A 5 kg balls is swing in a vertical circle at the end of a cord 1 m long. The maximum speed at which it can swing if the cord can sustain maximum tension of 150 N will be –
Choices
Choice (4)  Response  

a.  64 m/s 

b.  36.5 m/s 

c.  3.18 m/s 

d.  101 m/s 

Question number: 290
» Kinematics » Average Speed and Instantaneous Velocity
Question
A train has to negotiate a curve of radius 400 m. By how much should the outer rail be raised with respect to inner rail for a speed of 48 km/hr. The distance between the rails is 1 m.
Choices
Choice (4)  Response  

a.  12 m 

b.  12 cm 

c.  4.5 m 

d.  4.5 cm 

Question number: 291
» Electrostatics » Coulomb's Law
Question
Two small balls each having the charge + Q are suspended by insulating threads of length L from a hook. This arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each thread will be,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

