Light & Optics MCQs with Answers

All electromagnetic waves travel through a vacuum at ?

• A.The same speed
• B.Different speeds depending on frequency
• C.Different speeds depending on wavelength
• D.Zero speed

Light Emitting Diode (LED) is a _ semiconductor device.

• A.2 lead
• B.3 lead
• C.4 lead
• D.single lead

A radio signal will travel around the earth (in a great circle) in about ?

• A.1/7 second
• B.1 second
• C.7 seconds
• D.1/10 second

Roentgen rays are also called ?

• A.Gamma rays
• B.Ultraviolet rays
• C.Cathode rays
• D.X-rays

Radar transmits short pulses of high frequency called _?

• A.Radio waves
• B.Sound waves
• C.Microwaves
• D.Ultrasonic waves

How many lenses are present in a refracting telescope?

• A.One lens
• B.Two lenses
• C.Three lenses
• D.Four lenses

Compton effect is associated with ?

• A.X-Rays
• B.Gamma Rays
• C.Ultraviolet Rays
• D.Infrared Rays

Maximum kinetic energy of photoelectron depends upon _?

• A.Intensity of light
• B.Frequency of light
• C.Wavelength of light only
• D.Both intensity and frequency of light

The 2D image is obtained through _?

• A.Light microscope and TEM
• B.Light microscope and SEM
• C.SEM and TEM
• D.None of these

Raman spectra may be obtained in _?

• A.IR region only
• B.Visible region only
• C.IR and Visible region
• D.UV region only