Home
Class 11
PHYSICS
A student measures the thickness of a hu...

A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3.5 mm. The thickness of hair is

A

0.035 mm

B

0.04 mm

C

0.35 mm

D

0.40 mm

Text Solution

Verified by Experts

The correct Answer is:
A
0.035 mm
Promotional Banner

Topper's Solved these Questions

  • PHYSICAL WORLD AND MEASUREMENT

    MTG GUIDE|Exercise AIPMT / NEET MCQ|14 Videos

  • PHYSICAL WORLD AND MEASUREMENT

    MTG GUIDE|Exercise NEET CAFE TOPICWISE PRACTICE QUESTIONS (DIMENSIONAL ANALYSIS AND ITS APPLICATIONS)|38 Videos

  • OSCILLATIONS AND WAVES

    MTG GUIDE|Exercise AIPMT / NEET MCQs|43 Videos

  • PROPERTIES OF BULK MATTER

    MTG GUIDE|Exercise AIPMT/NEET (MCQs)|40 Videos

Similar Questions

Explore conceptually related problems

A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and findsd that the average width of the hair in the field of view of the microscope is 3.5mm. What is his estimate on the thickness of hair?

A boy measures the thickness of a human hair by looking at it through a microscope of magnification 100x. After 25 observations, the boy finds that the average width of the hair in the field of view of the microscope is 3.8 mm. What is the estimate on the thickness of hair?

A glass plate 4 mm thick is viewed from the above through a microscope. The microscope must be lowered 2.58 mm as the operator shifts from viewing the top surface to viewing the bottom surface through the glass. What is the index of refraction of the glass ?

The focal length of the objective of a microscope is int_(0)=3mm and of the eyepiece int_(e)=5cm. An object the magnification of the microscope of 3.1 mm from the objective.Find the magnification of the microscope for a normal eye, if the final image is produced at a distance 25 cm from the eye or eyepiece .Also final the separation between the lenses of microscope 180 13.46 cm

A student uses a metre scale, measuring upto 1 mm, to measure the length and breadth of a rectangular plate. He finds that length = 5.7 cm and breadth = 3.4 cm. What is the percentage error in the area of the plate ?

This interference film is used to measure the thickness of slides, paper, etc. The arrangement is as shown in fig. For the sake of clarity, the two strips are shown thick. Consider the wedge formed in between strips 1 and 2. If the interference pattern because of the two waves reflected from wedge surface is observed, then from the observed data we can compute thickness of paper, refractive index of the medium filled in wedge, number of bonds formed, etc. Considre the strips to be thick as compared to wavelength of ligth and light is incident normally. Neglect the effect due to reflection from top surface of strip 1 and bottom surface of strip 2. Take L = 5 cm and lambda_(air) = 40 nm . Consider an air wedge formed by two glass plates. having refractive index 1.5 by placing a piece of paper of thickness 20 mm. Determine the number of dark bands formed.

MTG GUIDE-PHYSICAL WORLD AND MEASUREMENT-CHECK YOUR NEET VITALS
  1. The pitch of a screw guage is 1 mm and there are 100 divisions on the ...

    Text Solution

    |

  2. There are atomic (Cesium) clocks capable of measuring time with an ac...

    Text Solution

    |

  3. What is the S.I. unit of density ?

    Text Solution

    |

  4. The equation of stationary wave is y = A sin kt cos omega ,where y and...

    Text Solution

    |

  5. A container contains 35 kg water and 0.2 kg water leaks from the conta...

    Text Solution

    |

  6. In the relation: P=(alpha)/(beta)e^(-(alphaZ)/(ktheta)),P is pressure ...

    Text Solution

    |

  7. A student measures the thickness of a human hair by looking at it thro...

    Text Solution

    |

  8. In an experiment of simple pendulum, the errors in the measurement of ...

    Text Solution

    |

  9. The dimensions of (b)/( a) in the equation P= (a-t^(2))/(bx) where P ...

    Text Solution

    |

  10. In the following equation, x, t and Frepresent displacement, time and ...

    Text Solution

    |

  11. What is the number of significant figures in 0.230 xx 10^(5)

    Text Solution

    |

  12. The study of the earth's surface is normally performed with

    Text Solution

    |

  13. Which one of the following is dimensionally correct?

    Text Solution

    |

  14. A quantity X is given by epsilon(0)u(DeltaV) where epsilon(0) is the p...

    Text Solution

    |

  15. The momentum of inertia of a body rotating about a given axis is 12.0 ...

    Text Solution

    |

  16. A wire has a mass (0.2 +- 0.002) g, radius (0.7+-0.007) mm and length ...

    Text Solution

    |

  17. If mass is measured in unit of alpha kg, length in beta m and time in ...

    Text Solution

    |

  18. Which of the following statement is incorrect regarding significant fi...

    Text Solution

    |

  19. The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, ...

    Text Solution

    |

  20. The density of a material in CGS system of units is 4 g cm^(-3). In a ...

    Text Solution

    |