NEET (NTANational Eligibility cum Medical Entrance Test) Physics: Questions 219  222 of 2142
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Question number: 219
» Laws of Motion » Force and Inertia
Question
The roadway bridge over a canal is the form of an arc of a circle of radius 20 m. What is the minimum speed with which a car can cross the bridge without leaving contact with the ground at the highest point (g = 9.8 m/s ^{2})
Choices
Choice (4)  Response  

a.  14 m/s 

b.  7 m/s 

c.  5 m/s 

d.  289 m/s 

Question number: 220
» Laws of Motion » Force and Inertia
Question
A cane filled with water is revolved in a vertical circle of radius 0.5 m and the water does not fall down n maximum period of revolution must be –
Choices
Choice (4)  Response  

a.  1.45 

b.  14.15 

c.  4.25 

d.  2.45 

Question number: 221
» Kinematics » Average Speed and Instantaneous Velocity
Question
A train has to negotiate a curve of radius 600 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 2 m.
Choices
Choice (4)  Response  

a.  12 m 

b.  12 cm 

c.  4.5 m 

d.  4.5 cm 

Question number: 222
» Electrostatics » Electric Flux
Question
A solid sphere S _{1} is connected to a charge reservoir through a heater H as shown in figure.
Flux through a closed spherical surface around S _{l} is given by = a t ^{2} where a is a constant and t is time in seconds. If resistance of heater is R then select correct statements
(1) Power consumed by heater will be 4α ^{2} ϵ_{0}^{2} Rt ^{2}.
(2) Electric flux through a closed spherical surface around S _{2} will be  α t ^{2}.
(3) Rate of change of electric flux through a closed spherical surface around S _{2} will be 2α t
(4) All of the above are correct.
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 2 

b.  1 and 3 

c.  1, 2 and 3 

d.  2 and 4 
