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The least count of the main scale of a screw gauge is 1 mm. The minimum number of divisions on its circular scale required to measure 5 μm diameter of a wire is

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Important Questions on Experiments in Physics

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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-1>Q 1
The pitch of a screw gauge is 0.5 mm and there are 100 divisions on it circular scale. The instrument reads +2 circular scale divisions when nothing is put in-between its jaws. In measuring the diameter of a wire, there are 8 divisions on the main scale and 83rd circular scale division coincides with the reference line. Then the diameter of the wire is
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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-1>Q 2
The pitch of a screw gauge having 50 divisions on its circular scale is 1 mm. When the two jaws of the screw gauge are in contact with each other, the zero of the circular scale lies 6 divisions below the line of graduation. When a wire is placed between the jaws, 3 linear scale divisions are clearly visible while the 31st division on the circular scale coincides with the reference line. The diameter of the wire is:
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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-1>Q 3
The smallest division on the main scale of a vernier caliper is 1 mm, and 10 vernier divisions coincide with 9 main scale divisions. While measuring the diameter of a sphere, the zero mark of the vernier scale lies between 2.0 and 2.1 cm and the fifth division of the vernier scale coincides with a scale division. The diameter of the sphere is,
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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-1>Q 4
The main scale of a vernier calipers reads 10 mm in 10 divisions. 10 divisions of Vernier scale coincide with 9 divisions of the main scale. When a cylinder is tightly placed between the two jaws, the zero of vernier scale lies slightly behind 3.2 cm and the fourth vernier division coincides with a main scale division. The diameter of the cylinder is:
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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-2>Q 1

The number of circular divisions on the shown screw gauge is 50 . It moves, $0.5 \mathrm{~mm}$ on main scale for one complete rotation. Main scale reading is 2 . The diameter of the ball is:

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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-2>Q 2
The density of a solid ball to be determined in an experiment. The diameter of the ball is measured with a screw gauge, whose pitch is 0.5 mm and there are 50 divisions on the circular scale. The reading on the main scale is 2.5 mm and that on the circular scale is 20 divisions. If the measured mass of the ball has a relative error of 2%, the relative percentage error in the density is, 
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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-2>Q 3
Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of -0.03 mm. While measuring the diameter of a thin wire, a student noted the main scale reading as 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is,
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Alpha Question Bank for Medical: Physics>Chapter 1 - Experiments in Physics>Exercise-2>Q 4
An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment, the distance is measured by,