Light & Optics MCQs with Answers

Pfund series lie in spectral region.

• A.Ultraviolet (UV)
• B.Visible
• C.Infrared (IR)
• D.X-ray

Which of the following is not included in EM radiation?

• A.Radio waves
• B.X-rays
• C.Sound rays
• D.Ultraviolet rays

Which of the following instruments is used for a precise measurement of refractive indices?

• A.Spectrometer
• B.Refractometer
• C.Polarimeter
• D.Interferometer

Which spectra series of hydrogen falls in the visible region?

• A.Lyman series
• B.Balmer series
• C.Paschen series
• D.Brackett series

Which of the following is NOT a property of x-rays?

• A.They travel in straight lines
• B.They can penetrate solid objects
• C.They are deflected by electric and magnetic fields
• D.They affect photographic plates

Which of the following spectroscopy uses an energy source of around 7eV?

• A.NMR (Nuclear Magnetic Resonance) spectroscopy
• B.IR (Infrared) spectroscopy
• C.UV (Ultraviolet) spectroscopy
• D.X-ray spectroscopy

Which of the following electromagnetic phenomena cannot be explained by the wave nature of light alone?

• A.Interference
• B.Diffraction
• C.Photoelectric effect
• D.Polarization

Which type of electromagnetic wave has the smallest wavelengths?

• A.Radio waves
• B.Microwaves
• C.Gamma rays
• D.Infrared waves

Which of the following rays are used to destroy bacteria and insects?

• A.Ultraviolet rays
• B.Gamma rays
• C.Both A and B
• D.Infrared rays

Gamma rays consist of

• A.Electrons
• B.Protons
• C.Photons
• D.Neutrons