JEE PHYSICS UNIT 15
QUIZ NO 1
TOTAL QUESTIONS = 20
1. Electromagnetic waves are produced by
A. accelerated charges
B. stationary charges
C. charges in uniform motion
D. none of these
2. The electromagnetic waves with the longest wavelength are
A. radio waves
B. gamma rays
C. microwaves
D. infrared waves
3. The frequency range of visible light is approximately
A. 4 × 10^14 Hz to 8 × 10^14 Hz
B. 3 × 10^12 Hz to 3 × 10^15 Hz
C. 10^10 Hz to 10^12 Hz
D. 10^8 Hz to 10^10 Hz
4. The speed of electromagnetic waves in a vacuum depends on
A. electric and magnetic field strengths
B. permittivity and permeability of free space
C. wavelength and frequency
D. intensity of the waves
5. The polarization of electromagnetic waves is due to the property of
A. electric field vector
B. magnetic field vector
C. both electric and magnetic fields
D. none of these
6. In a plane electromagnetic wave, the electric field and magnetic field vectors are
A. perpendicular to each other
B. parallel to each other
C. in the same direction
D. none of these
7. The wavelength of electromagnetic waves used in radar systems is in the range of
A. microwaves
B. infrared waves
C. gamma rays
D. ultraviolet rays
8. Which type of electromagnetic waves is used for satellite communication?
A. microwaves
B. infrared waves
C. gamma rays
D. radio waves
9. The energy of a photon is given by
A. hf
B. hc/λ
C. hλ
D. both hf and hc/λ
10. The phenomenon which proves the transverse nature of electromagnetic waves is
A. interference
B. diffraction
C. polarization
D. photoelectric effect
11. The electromagnetic waves with the highest energy are
A. gamma rays
B. ultraviolet rays
C. microwaves
D. radio waves
12. Infrared waves are commonly known as
A. heat waves
B. light waves
C. radio waves
D. cosmic waves
13. The main source of X-rays is
A. radioactive decay
B. electrons striking a metal target
C. nuclear fusion
D. gamma ray bursts
14. The Poynting vector of an electromagnetic wave represents
A. energy flow per unit area per unit time
B. intensity of the wave
C. direction of wave propagation
D. all of these
15. The ratio of the magnitudes of electric and magnetic fields in an electromagnetic wave is equal to
A. speed of light
B. permittivity of free space
C. permeability of free space
D. none of these
16. Which type of electromagnetic waves is used in remote controls for televisions?
A. infrared waves
B. microwaves
C. radio waves
D. ultraviolet rays
17. Ultraviolet radiation is harmful because
A. it causes ionization of cells
B. it heats the cells excessively
C. it produces gamma rays
D. it causes magnetic field disturbances
18. The sky appears blue due to
A. scattering of shorter wavelengths
B. reflection of blue light
C. absorption of longer wavelengths
D. polarization of light
19. The electromagnetic spectrum includes
A. all possible frequencies of electromagnetic radiation
B. only visible light
C. only ultraviolet and infrared waves
D. only radio waves
20. The displacement current is significant in
A. vacuum
B. dielectrics
C. conductors
D. insulators
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