Wavelength measurement instrument: MCQ with Answer and Explanation

Wavelength measurement instrument:
A. Microscope
B. Telescope
C. Spectrometer
D. Galvanometer
Answer: Option C
Solution (By JKSSB Mock Tests)
Spectrometer uses diffraction grating/prism to disperse light and measure wavelengths via angular positions. Memory tip: 'Spectrometer = wavelength via dispersion; used in spectroscopy'. Instrument application frequently tested in competitive exams.

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Practice More Physics Questions

Question #1
A car travels 30 m in 2 s with uniform acceleration starting from rest. Acceleration is
A. 7.5 m/s²
B. 30 m/s²
C. 3.75 m/s²
D. 15 m/s²

Correct Answer: Option D


Explanation:
s = ½ a t² => 30 = ½ a (4) => a = 15 m/s².

This question belongs to: Science Physics
Question #2
The Nobel Prize in Physics 1901 was awarded to
A. Röntgen
B. Planck
C. Curie
D. Einstein

Correct Answer: Option A


Explanation:
Wilhelm Röntgen for discovery of X-rays.

This question belongs to: Science Physics
Question #3
The greenhouse effect is mainly due to increase in
A. Argon
B. Oxygen
C. Nitrogen
D. Carbon dioxide

Correct Answer: Option D


Explanation:
CO2, methane trap heat.

This question belongs to: Science Physics