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21 . Which instrument is used to measure curvature of spherical objects ?
A. Sextant B. Spherometer
C. Spectroscope D. Spectrometer

22 . Which instrument is used to record spectra?
A. Sextant B. Spherometer
C. Spectroscope D. Spectrometer

23 . Which instrument is used to measure the position of spectral lines?
A. Sextant B. Spherometer
C. Spectroscope D. Spectrometer

24 . Which instrument is used to measure the height of very distant objects and also used by navigators to find the latitude?
A. Sextant B. Spherometer
C. Spectroscope D. Spectrometer

25 . Which instrument is used to record physical happenings at a distant place ?
A. Telemeter B. Tonometer
C. Thermostat D. Transponder




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