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Grade: 12

                        

The main scale of vernier callipers reads in mm and its vernier scale is divided into 8 divisions which coincide with 5 divisions of the main scale. When the two jaws touch each other, the zero of the vernier coincides with the zero of main scale. When a rod is tightly placed along its length between the jaws, it is observed that the zero of vernier scale lies just left to 36th division of main scale and fourth division of vernier scale coincides with one main scale division. The measured value is (in cm) (1) 3.66 (2) 3.55 (3) 3.65 (4) 3.56 I am getting option 3 through simple use of formulas but answer given is two.

6 months ago

Answers : (2)

Arun
24742 Points
							
Zero error = 0.5 mm = 0.05 cm
Observed reading of cylinder diameter - 3.1 cm + (4) (0.01 cm).
= 3.6 cm
Actual thickness of cylinder = (3.60) - (0.05).
= 3.55 cm
6 months ago
Harshit Bhansali
23 Points
							
Sir how is there a zero error when the ques says "When the two jaws touch each other, the zero of the vernier coincides with the zero of main scale”  
6 months ago
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