10th Class Physics Chapter 11 Test20. Electromagnetics waves

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The phenomenon of blue sky and red sky is explained by:
   1. Dispersion of light
   2. Polarization of light
   3. Scattering of light
   4. Reflection of light
2. Prolonged exposure to infrared waves can cause:
   1. Hearing loss
   2. Thermal damage and burns
   3. Muscle cramp
   4. Bone fracture
3. Which type of light waves scatter more?
   1. Longer wavelengths
   2. Shorter wavelengths
   3. Equal wavelengths
   4. None of these
4. As frequency of electromagnetic waves increases, their wavelength:
   1. Increases
   2. Decreases
   3. Remains constant
   4. Remains constant
5. The direction of wave propagation in electromagnetic waves is:
   1. Parallel to electric field
   2. Parallel to magnetic field
   3. Perpendicular to both electric and magnetic fields
   4. Opposite to magnetic field
6. Which rays are widely used in medical imaging?
   1. Infrared rays
   2. X-rays
   3. Gamma rays
   4. Microwaves
7. The atomic structure of solids or cracks in solid structures can be investigated by:
   1. Microwaves
   2. Ultraviolet
   3. Gamma rays
   4. X-rays
8. Scattering of light occurs when light waves:
   1. Absorb heat from particles
   2. Bounce off particles in a medium
   3. Pass straight without deviation
   4. Change into sound waves
9. Frequency (f) and wavelength (λ) are related by the equation:
   1. c = f × λ
   2. f = c × λ
   3. f = c / λ
   4. λ = f / c
10. Which of these electromagnetic waves has the least momentum?
    1. Gamma rays
    2. Ultraviolet
    3. Infrared
    4. Infrared