NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 401  403 of 2142
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Question number: 401
» Communication System » Sky and Space Wave Propagation
Question
When the zero of the circular scale of a screw gauge coincides with the zero of the main scale before A and B come in contact then the instrument has which type of error?
Choices
Choice (4)  Response  

a.  Can’t be said anything 

b.  Positive zero error 

c.  No zero error 

d.  Negative zero error 

Question number: 402
» Communication System » Sky and Space Wave Propagation
Question
In a screw gauge, the zero of main scale coincides with fifth division of circular scale in figure (i). The circular divisions of screw gauge are 50. It moves 0.5 mm on main scale in one rotation. The diameter of the ball in figure (ii)
Choices
Choice (4)  Response  

a.  1.25mm 

b.  1.20mm 

c.  1.25rnm 

d.  2.20mm 

Question number: 403
» Electrostatics » Electric Potential
Question
Identical point charges, each having +q charge, are fixed at each of the points x = x _{0}, x = 3x _{0}, x = 5x _{0} ……… infinite, on the xaxis and an identical point charges, each having q charge, are fixed at each of the points x = 2x _{0}, x = 4x _{0}, x = 6x _{0} ……. infinite. Here x _{0} is a positive constant. Potential at the origin due to the above system of charges is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  0 
