NEST (National Entrance Screening Test) Physics: Questions 20  23 of 58
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Question number: 20
» 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.  0 

d. 


Question number: 21
» Atoms and Nuclei » Half Life and Mean Life
Appeared in Year: 2009
Question
A radioactive source, having a half – life of five minutes, was found to have a counting rate of at a certain point in time. Fifteen minutes after this observation, the counting rate is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 22
» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance
Appeared in Year: 2009
Question
Two identical circular current carrying coils and , each of radius are placed adjacently a distance apart . They carry equal currents in opposite sense. Let denote the self and mutual inductances.
Which of the following is at least approximately true?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 23
» 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.  (ii) and (iii) only 

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

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

d.  (i) and (iii) 
