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Class 11
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Spherometer
Spherometer
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1)
An instrument for measuring focal length of a lens is called :
spherometer
focometer
heliometer
goniometer
2)
The distance through which the screw advances when it is rotated through one division of the head scale is called?
Least count
Pitch
Zero error
Zero correction
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 cm
0.1 mm
0.01 mm
0.001 mm
4)
What is the zero correction for a spherometer?
Positive.
No zero correction.
May be positive or negative.
Negative.
5)
When the circular scale completes one rotation, what is the distance moved by the screw?
Pitch
Least count
Zero correction
Zero error
6)
The principle of spherometer is same as which of the following?
Screw gauge
Micrometer screw
Vernier calliper
Spectrometer
7)
What is the possible least count of your laboratory spherometer?
0.2 mm
0.01 mm
0.05 mm
0.1 mm
8)
The least count of spherometer is calculated by:
Pitch / No of rotations
Pitch × No of head scale divisions
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?
Spherometer
Vernier calipers
Spectrometer
Screw guage
10)
Why is a spherometer so called?
All of these
Measures refractive index of a sphere
Measures the diameter of the circle
Measures the radius of curvature of a sphere
