NEET (NTANational Eligibility cum Medical Entrance Test) Physics: Questions 239  242 of 2142
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Question number: 239
» Electrostatics » Electrostatic Potential Energy
Question
Two equal negative point charges 2µC place1 m apart from each other in air. so what is the potential energy of the system?
Choices
Choice (4)  Response  

a.  2eV 

b.  2 J 

c.  4 J 

d.  0.036 J 

Question number: 240
» Physics and Measurement » Accuracy and Precision of Measuring Instruments
Question
A student performs an experiment for determination of . The error in length is ∆ and in time T is ∆ T and n is number of times the reading is taken. The measurement of g is most accurate for
Choices
Choice (4)  Response  

a.  ∆l = 5mn, ∆ T = 0.2 sec, n = 10 

b.  ∆l = 5mn, ∆T = 0.2 sec, n = 20 

c.  ∆l = 5mn, ∆T = 0.1 sec, n = 10 

d.  ∆l = 1mn, ∆T = 0.1 sec, n = 50 

Question number: 241
» Kinematics » Average Speed and Instantaneous Velocity
Question
Two bodies P and Q are moving along positive xaxis their positiontime graph is shown below. If VPQ is velocity of P w. r. t. Q and VQP is velocity of Q w. r. t P, then
Select the correct answers and mark it according to the following codes:
(1)
(2)
(3)
(4)
Choices
Choice (4)  Response  

a.  1, 2 and 3 are correct 

b.  2 and 4 are correct 

c.  1 and 3 are correct 

d.  1 and 2 are correct 

Question number: 242
» Electrostatics » Equipotential Surfaces
Question
In the electric field of a point charge q, a certain charge is carried from point A to B, C, D and E. Then the work done by electric force is
Choices
Choice (4)  Response  

a.  Zero along all the paths AB, 

b.  Least along AE 

c.  Least along the path AD 

d.  Least along the path AB 
