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XI-2-C-1 Measurement Methods
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What is meant by direct and indirect methods of measurements is explained in this lesson

Pradeep Kshetrapal
State topper in school exams, selected in IIT Kharagpur, M.Sc., 30 yrs in teaching.

Unacademy user
sir please make video on Error analysis thank u sir
Good afternoon sir pls sir suggest me how to prepare for neet physics lefficiently in time does we have enough time to prepare. This time I was unable to complete
  1. PHYSICS CLASS XI (+1/ Chapter 2 Units and Measurement Lecture no. XI-2- C-1 Methods of Measuring Length Physics by Pradeep Kshetrapal


  2. In this chapter we are goingto stud different methods being employed to measure different quantities. The quantity ywhich we are going to measure here is LENGTH Physics by Pradeep Kshetrapal


  3. We define Length as difference of position between two points There are basically two,classes of methods to do this meas rement. These are:- 1. Direct methods 2.Indirect methods Physics by Pradeep Kshetrapal


  4. 1. Direct Method: In this method both the points are in aur approach and we use an instrument to n of positionse easte difference Example : Measuring length of a table, room, field and even Road. We can approach both ends and can use measuring instrument. Physics by Pradeep Kshetrapal 4


  5. Instruments used for direct measurement BLER 24 meter scale: for accuracy 20 21 22 23 24 up-to 1 mm TERNAL JAWS SCREW MPERIAL SCALE 2. Vernier calliper for accuracy up-to 0,1 mm METRIC SCALE DEPTH MEASURING BLADE EXTERNAL JAWS Physics by Pradeep Kshetrapal


  6. Screw gauge and Spherometer for accuracy up-to 0.01mm 10-4 031 Physics by Pradeep Kshetrapal


  7. 2. Indirect methods of measuremext are used or measuring distance benvkeen two such ach physically Example Height of mountain Distance of star, Size of molecule, depth of sea points where we cannot a Physics by Pradeep Kshetrapal


  8. Different methods are used which are b ase on mathematical calculations Few examples are by use of 1. Trigonometry e2.Reflection of waves Physics by Pradeep Kshetrapal