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Spherometer
 1) An instrument for measuring focal length of a lens is called : heliometer spherometer goniometer focometer

 2) The distance through which the screw advances when it is rotated through one division of the head scale is called? Zero correction Pitch Zero error Least count

 3) The pitch of a spherometer is 1 mm and number of head scale division is 100. What is the least count of the spherometer? 0.01 mm 0.01 cm 0.1 mm 0.001 mm

 4) What is the zero correction for a spherometer? No zero correction. Positive. May be positive or negative. Negative.

 5) When the circular scale completes one rotation, what is the distance moved by the screw? Least count Zero correction Zero error Pitch

 6) The principle of spherometer is same as which of the following? Spectrometer Screw gauge Vernier calliper Micrometer screw

 7) What is the possible least count of your laboratory spherometer? 0.05 mm 0.01 mm 0.2 mm 0.1 mm

 8) The least count of spherometer is calculated by: Pitch × No of head scale divisions Pitch × No of rotations Pitch / No of rotations Pitch / No of head scale divisions

 9) What is the instrument used to measure the radius of curvature of a surface? Spectrometer Screw guage Vernier calipers Spherometer

 10) Why is a spherometer so called? Measures the radius of curvature of a sphere Measures refractive index of a sphere All of these Measures the diameter of the circle

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