JEE PHYSICS UNIT 15
QUIZ NO 3
TOTAL QUESTIONS = 20
1. In an electromagnetic wave in free space, the root mean square value of the electric field is Erms = 6 V/m. The peak value of the magnetic field is:
A. 2.83 x 10^-8 T
B. 0.70 x 10^-8 T
C. 4.23 x 10^-8 T
D. 1.41 x 10^-8 T
2. Out of the following options, which one can be used to produce a propagating electromagnetic wave?
A. An accelerating charge
B. A charge moving at constant velocity
C. A stationary charge
D. A chargeless particle
3. A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c = velocity of light):
A. E/c
B. 2E/c
C. 2E/c^2
D. E/c^2
4. The energy of the electromagnetic waves is of the order of 15 keV. To which part of the spectrum does it belong?
A. X-rays
B. Infrared rays
C. Ultraviolet rays
D. γ-rays
5. Light with an energy flux of 25 x 10^4 W/m^2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm^2, the average force exerted on the surface is:
A. 1.25 x 10^-6 N
B. 2.50 x 10^-6 N
C. 1.20 x 10^-6 N
D. 3.0 x 10^-6 N
6. An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity εr = 4.0. Then, the wavelength and speed of the wave in the medium are:
A. 50 m, 1.5 x 10^8 m/s
B. 100 m, 3.0 x 10^8 m/s
C. 50 m, 3.0 x 10^8 m/s
D. 100 m, 1.5 x 10^8 m/s
7. The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is:
A. 1:1
B. c:1
C. 1:c
D. c^2:1
8. Which of the following statements is false for the properties of electromagnetic waves?
A. Both electric and magnetic field vectors attain the maxima and minima at the same place and same time
B. The energy in electromagnetic wave is divided equally between electric and magnetic vectors
C. Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave
D. These waves do not require any material medium for propagation
9. The electric field associated with an electromagnetic wave in vacuum is given by E = 40 cos(kz - 6 x 10^8 t) i V/m, where E, z, and t are in SI units. The value of k is:
A. 2 m^-1
B. 0.5 m^-1
C. 3 m^-1
D. 6 m^-1
10. The electric and magnetic field, associated with an electromagnetic wave, propagating along the +z-axis, can be represented by:
A. Ex, By
B. Ez, Bx
C. Ey, Bz
D. Ex, Bz
11. The energy carried by an electromagnetic wave is proportional to:
A. frequency
B. wavelength
C. amplitude squared
D. none of these
12. Infrared waves are produced by:
A. oscillations of charge in conductors
B. radioactive decay
C. high-energy transitions in nuclei
D. vibrations of atoms and molecules
13. The electromagnetic spectrum includes:
A. only visible light
B. all possible frequencies of electromagnetic radiation
C. only ultraviolet and infrared waves
D. only radio waves
14. The property of electromagnetic waves that makes them suitable for radar systems is:
A. long wavelength
B. short wavelength
C. ability to be polarized
D. high speed
15. Which type of electromagnetic waves is emitted by a black body at room temperature?
A. X-rays
B. Gamma rays
C. Infrared waves
D. Ultraviolet rays
16. Ultraviolet radiation is harmful because:
A. it ionizes cells
B. it generates high heat
C. it creates electromagnetic interference
D. it causes atomic excitation only
17. A beam of light passing through a prism disperses into various colors because of:
A. polarization
B. refraction
C. interference
D. diffraction
18. Which of the following electromagnetic waves has the highest energy?
A. Infrared waves
B. Microwaves
C. X-rays
D. Gamma rays
19. The magnetic field in an electromagnetic wave is represented as B = B0 sin(kx - ωt). The electric field E is given by:
A. E = B0c sin(kx - ωt)
B. E = B0/c sin(kx - ωt)
C. E = B0 sin(kx - ωt)
D. E = -B0c sin(kx - ωt)
20. Electromagnetic waves transport:
A. momentum
B. energy
C. both momentum and energy
D. none of these
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