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NEET UG PHYSICS MCQ: UNITS & MEASUREMENTS
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In which of the following instruments used in the lab there exists an error of random category known as back lash error?
(i) Screw gauge
(ii) Spherometer
(iii) Searle's apparatus
(iv) Vernier callipers
(i) Screw gauge
(ii) Spherometer
(iii) Searle's apparatus
(iv) Vernier callipers
View answer and explanation
Correct option: B
(i), (ii) and (iii) only
Option B is correct because backlash error, a type of random error, occurs in instruments with screws and gears like screw gauges, spherometers, and Searle's apparatus.
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Statement-I: Random errors can be positive or negative.
Statement-II: Cause of random errors are uncertain. An object is moving through the liquid. The viscous damping force acting on it is proportional to the velocity. Then dimension of constant of proportionality is The error due to parallax is a: 2.34 is obtained by rounding of the number The dimensional formula of self-inductance is The dimension of is that of
Statement-II: Cause of random errors are uncertain. An object is moving through the liquid. The viscous damping force acting on it is proportional to the velocity. Then dimension of constant of proportionality is The error due to parallax is a: 2.34 is obtained by rounding of the number The dimensional formula of self-inductance is The dimension of is that of