NEET Solved Paper 2018 Question 37

Question: A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of -0.004 cm, the correct diameter of the ball is [NEET - 2018]

Options:

A) 0.053 cm

B) 0.525 cm

C) 0.521 cm

D) 0.529 cm

Show Answer

Answer:

Correct Answer: D

Solution:

Diameter of the ball $ \text{=MSR+CSR }\times\text{ (Least count)–Zero error} $

$ \text{=0}\text{.5 cm+25 }\times\text{ 0}\text{.001–(–0}\text{.004)} $

$ =0.5+0.025+0.004 $ $ \text{=0}\text{.529 cm} $