MCQs

Q521: The type of waves that are used in the television remote controllers?

• A) Radio waves
• B) Infra-red waves
• C) Ultra-violet waves

Q522: A narrow beam of white light passes from air into the glass and is refracted. The wave characteristic remains unchanged in its ______?

• A) Direction
• B) Speed
• C) Frequency

Q523: The type of electromagnetic wave used in security scanners at night is ______?

• A) Microwaves
• B) Infra-red
• C) Radio waves

Q524: The list that shows electromagnetic waves in order of an increasing wavelength is _____?

• A) Microwaves, X-rays, Gamma-rays
• B) Microwaves, Gamma-rays, X-rays
• C) Gamma-rays, X-rays, Microwaves

Q525: The group containing only electromagnetic waves is ______?

• A) Light waves, Radio waves, Microwaves
• B) Light waves, Radio waves, Sound waves
• C) Light waves, Sound waves, Microwaves

Q526: The Velocity of light in a diamond is (whereas the refractive index of a diamond with respect to vacuum is 2.5)?

• A) 5x10^8m/s
• B) 2.5x10^8m/s
• C) 1.2x10^8m/s

Q527: The electromagnetic rays used in radiotherapy to destroy cancer cells are ______?

• A) Infrared rays
• B) X-rays
• C) Visible rays

Q528: The waves that have maximum penetrating power to treat tumors are ______?

• A) Ultraviolet radiation
• B) Microwaves
• C) Gamma-rays

Q529: Which type of wave cannot travel through a vacuum?

• A) Sound waves
• B) Microwaves
• C) Infra-red radiation

Q530: The causes of the echo is _____?

• A) Absorption
• B) Dispersion
• C) Reflection