Physics and Measurement (NEST (National Entrance Screening Test) Physics): Questions 1  3 of 5
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Question number: 1
» Physics and Measurement » Dimensional Analysis and Its Applications
Appeared in Year: 2007
Question
The scattering of an electromagnetic wave by a charged particle of charge and mass is described in terms of the ‘Thomson Cross Section’ , which has the dimension of area. On the basis of dimensional analysis, the possible formula for is – [The symbols have the usual meanings. ]
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 2
» Physics and Measurement » Errors in Measurement
Appeared in Year: 2013
Question
The mean momentum of a particle has uncertainty . Taking Planck’s constant to be , the uncertainty in the de Broglie wavelength of the particle is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  0 

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Question number: 3
» Physics and Measurement » Dimensional Analysis and Its Applications
Appeared in Year: 2013
Question
Consider the following pairs of quantities:
(i) Coefficient of friction and relative permittivity
(ii) Breakdown voltage in lightning discharge and electric potential
(iii) Torque and kinetic energy
(iv) Light year and time period of simple harmonic motion
Which of the above pairs of quantities have the same dimensions?
Choices
Choice (4)  Response  

a.  (i), (ii) and (iii) only 

b.  (i) and (iii) 

c.  (ii) and (iii) only 

d.  (i), (ii), (iii) and (iv) 

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