Light & Optics MCQs with Answers

We use driving mirrors to be convex instead of plane as they _?

• A.Reduce glare
• B.Show magnified image
• C.Show inverted image
• D.Show wider view

The Paschen series of hydrogen lies in the ?

• A.Ultraviolet region
• B.Infrared region
• C.Visible region
• D.X-ray region

In Bragg's equation (2dSinθ = nλ), ‘n’ represents:

• A.Wavelength of X-rays
• B.The order of reflection
• C.Interplanar spacing
• D.Angle of incidence

Which is more energetic?

• A.X-rays
• B.Ultraviolet rays
• C.𝛾-rays
• D.Infrared rays

As per the second photoelectric experiment, photoelectric effect does not occur if the frequency of the incident light is?

• A.Above the threshold frequency
• B.Any frequency can cause it
• C.Equal to the threshold frequency
• D.Below the threshold frequency

Wavelength symbol "λ" is termed as ?

• A.Lambda
• B.Gamma
• C.Theta
• D.Delta

Bragg's equation is a consequence of _?

• A.Maxwell's equations
• B.Laue equations
• C.Schrödinger equation
• D.Planck's equation

Calculate the number of photons, from green light of mercury (λ = 4961 Å), required to do one joule of work?

• A.4.9610 × 10¹⁸
• B.2.4961 × 10²⁰
• C.2.4961 × 10¹⁸
• D.4.9610 × 10²⁰

What would be the transmittance reading on a spectrophotometer at 0.25 absorbance?

• A.0.56 T
• B.0.75 T
• C.0.25 T
• D.1.25 T

In which region does the limiting line of the Balmer series lie?

• A.Visible region
• B.Infrared region
• C.Ultraviolet region
• D.X-ray region