Light & Optics MCQs with Answers

_ waves used by the Radars.

• A.Radio waves
• B.Sound waves
• C.Seismic waves
• D.Water waves

In a photoelectric cell, the velocity of ejection of an electron emitted depends upon _?

• A.Wavelength of the emitted electron
• B.Intensity of the incident light
• C.Frequency of the incident light
• D.Temperature of the metal surface

Absorbance of solution at 100% T is?

• A.0.0
• B.1.0
• C.100
• D.Infinity

Which type of electromagnetic wave possesses the most energy?

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

Which of the following correctly lists electromagnetic waves in order from longest to shortest wavelength?

• A.Television, infrared, visible light, X-rays
• B.X-rays, visible light, infrared, television
• C.Infrared, television, X-rays, visible light
• D.Visible light, television, X-rays, infrared

Laser is _ part of physics?

• A.Atomic
• B.Nuclear
• C.Quantum
• D.Thermodynamic

The velocity of light in a diamond is (whereas the refractive index of a diamond with respect to vacuum is 2.5)?

• A.2.5 × 10^8 m/s
• B.3.0 × 10^8 m/s
• C.7.5 × 10^8 m/s
• D.1.2 × 10^8 m/s

Which type of waves are used for sending signals to the satellite from a ground station?

• A.Radio waves
• B.Infrared waves
• C.Microwaves
• D.Ultraviolet waves

The lifetime of an electron in metastable state is times more than an ordinary excited state.

• A.10^2 to 10^3
• B.10^3 to 10^5
• C.10^5 to 10^8
• D.Both B and C

Which one of the following is used in oven?

• A.Ultraviolet rays
• B.Infrared waves
• C.Microwaves
• D.X-rays