Physics

Thickness of a pencil measured by using a screw gauge (least count .$$001\ cm$$) comes out to be $$0.802\ cm$$. The percentage error in the measurement is :


ANSWER

$$0.125\%$$


SOLUTION
Least count screw gause is $$= 0.001 cm$$ 

The error will be thickness, $$t = 0.802 \pm 0.001$$

$$\Delta t $$ is $$0.001 cm$$

Percentage error $$= \dfrac{\Delta t}{t} \times 100\%$$

Percentage error $$= \dfrac{0.001}{0.802} \times 100\%$$

Percentage error $$= 0.125\%$$
View Answers

You're just one step away

Create your Digital Resume For FREE on your name's sub domain "yourname.wcard.io". Register Here!


Single Correct Medium Published on 18th 08, 2020
Next Question
Questions 244531
Subjects 8
Chapters 125
Enrolled Students 199
Enroll Now For FREE

Realted Questions

Q1 Single Correct Medium

The dimensional formula
for the physical quantity $$\cfrac {B \mu_0 \epsilon_0}{E}$$ is : (E=intensity
of electric field, B-magnetic induction and symbols have their usual meaning)




  • A. $$L^oMT $$
  • B. $$L^1MT^{-1}$$
  • C. $$L^{-3}MT^3$$
  • D. $$L^{\cfrac {1}{2}}MT^{-\cfrac {1}{2}}$$

Asked in: Physics - Units and Measurement


1 Verified Answer | Published on 18th 08, 2020

View Answer
Q2 Subjective Medium
Find the value of the multiplication $$3.124 \times 4.576$$ correct to three significant figures.

Asked in: Physics - Units and Measurement


1 Verified Answer | Published on 18th 08, 2020

View Answer
Q3 Subjective Medium
The length of a rectangular sheet is $$1.5$$cm and the breadth is $$1.203$$ cm. Find the areas of the face of a rectangular sheet to the correct number of significant figures.

Asked in: Physics - Units and Measurement


1 Verified Answer | Published on 18th 08, 2020

View Answer
Q4 Single Correct Medium
A physical quantity $$X$$ is expressed as velocity$$\displaystyle =\sqrt{\frac{X}{density}}$$ . The dimensions of $$X$$ are 
  • A. $$ [MLT^{-1}] $$
  • B. $$ [ML^2T^{-2}] $$
  • C. $$ [ML^{-1}T^{-2}] $$
  • D. $$ [ML^2T^{-1}] $$

Asked in: Physics - Units and Measurement


1 Verified Answer | Published on 18th 08, 2020

View Answer
Q5 Subjective Medium
The distance of a galaxy is $$56 \times10^{25}m$$. Assume the speed of light to be $$3\times10^8 m s^{-1}$$. Express order of magnitude of time taken by light travelled to the galaxy.

Asked in: Physics - Units and Measurement


1 Verified Answer | Published on 18th 08, 2020

View Answer