NEET Physics: Questions 20  24 of 2142
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Question number: 20
» 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.  4x 

b.  2 x 

c.  0.25 x 

d.  0.5x 

Question number: 21
» Kinematics » Motion in a Straight Line
Question
A particle moves along xaxis as x = 4 (t  2) + a (t  2) ^{2}
Choices
Choice (4)  Response  

a. 
The acceleration of particle is 2a 

b. 
The initial velocity of particle is 4 

c.  The particle is at origin at t = 0 

d.  Question does not provide sufficient data or is vague 

Question number: 22
» Physics and Measurement » Errors in Measurement
Question
The length of a cylinder is measured with a meter rod having least count 0.1 cm. Its diameter is measured with Vernier calipers having least count 0.01 cm. Given that length is 5.0 cm. and radius is 2.0 cm. The percentage error in the calculated value of the volume will be
Choices
Choice (4)  Response  

a.  4% 

b.  1 % 

c.  2% 

d.  3% 

Question number: 23
» Physics and Measurement » Errors in Measurement
Question
According to Joule’s law of heating, heat produced H = I ^{2} Rt, where I is current, R is resistance and t is time. If the errors in the measurements of I, R, and t. are 3%, 4 % and 6 % respectively then error in the measurement of H is
Choices
Choice (4)  Response  

a.  17 % 

b.  25% 

c.  16% 

d.  19% 

Question number: 24
» Physics and Measurement » Errors in Measurement
Question
Error in the measurement of radius of a cylinder is 4%. The error in the calculated value of its volume is
Choices
Choice (4)  Response  

a.  8% 

b.  5% 

c.  3% 

d.  7% 
