Physics and MeasurementErrors in Measurement (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 1  5 of 29
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Question number: 1
» Physics and Measurement » Errors in Measurement
Question
The resistance R = V/i where V = 100 + or  5 volts and i = 10 + 0.2 amperes. What is the total error in R?
Choices
Choice (4)  Response  

a.  5 % 

b.  5.2 % 

c.  5/2 % 

d.  7 % 

Question number: 2
» Physics and Measurement » Errors in Measurement
Question
If the length of rod A is 3.25 + 0.01 cm and that of B is 4.19 + 0.01 cm then the rod B is longer than rod A by
Choices
Choice (4)  Response  

a.  0.94 + 0.02 cm 

b.  0.94 + 0.01 cm 

c.  0.94 + 0.00 cm 

d.  All of the above 

Question number: 3
» Physics and Measurement » Errors in Measurement
Question
Assertion (Ꭺ)
Out of three measurements l = 0.7 m; l = 0.70 m and l = 0.700 m, the last one is most accurate.
Reason (Ꭱ)
In every measurement, only the last significant digit is not accurately known.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Ꭺ is false but Ꭱ is true 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are false 

Question number: 4
» Physics and Measurement » Errors in Measurement
Question
The period of oscillation of a simple pendulum is given by T = 2π
where l is about 100 cm and is known to have l mm accuracy. The period is about 2s. The time of 100 oscillations is measured by a stopwatch of least count 0.1s. The percentage error in g is
Choices
Choice (4)  Response  

a.  0.2% 

b.  0.1% 

c.  0.8% 

d.  1% 

Question number: 5
» Physics and Measurement » Errors in Measurement
Question
The random error in the arithmetic mean of 100 observations is x; then random error in the arithmetic mean of 400 observations would be
Choices
Choice (4)  Response  

a.  2 x 

b.  0.25 x 

c.  0.5x 

d.  4x 
