Physics and Measurement (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 56  59 of 62
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Three of the fundamental constants of physics are the universal gravitational constant, G = 6.7 x 10 ^{11 } m ^{3} kg ^{1} s ^{2}, the speed of light, c = 3.0 x 10 ^{8} m/s, and Planck’s constant,
h = 6.6 x 10 ^{34} kg m ^{2} s ^{1}.
Question number: 56 (2 of 2 Based on Passage) Show Passage
» Physics and Measurement » Dimensions of Physical Quantities
Question
Find the value of Planck time in seconds
The universal gravitational constant, G = 6.7 x 10 ^{11} m ^{3} kg ^{1} s ^{2}, the speed of light, c = 3.0 x 10 ^{8} m/s, and Planck’s constant, h = 6.6 x 10 ^{34} kg m ^{2} s ^{1}.
Choices
Choice (4)  Response  

a. 
2.3 10 ^{13} s 

b. 
1.3 10 ^{33} s 

c. 
1.3 10 ^{ 43} s 

d.  None of the above 

Question number: 57
» Physics and Measurement » Dimensional Analysis and Its Applications
Question
In an experiment the angles are required to be measured using an instrument, 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half a degree (= 0.5°), then the least count of the instrument is:
Choices
Choice (4)  Response  

a.  half minute 

b.  one minute 

c.  one degree 

d.  half degree 

Question number: 58
» Physics and Measurement » Fundamental and Derived Units. Least Count
Question
A Vernier caliper N divisions of Vernier scale coincides with N  1 divisions of main scale (in which length of one division is 1 mm). The least count of the instrument should be
Choices
Choice (4)  Response  

a.  1 10 N 

b.  N1 

c.  N 

d.  1/N  1 

Question number: 59
» 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 
