Time Left:
600
sec
2. Which region in the electromagnetic spectrum will have the highest speed?
A. Radio
B. Visible
C. All the regions have same speed
D. Microwaves
3. Which region in the electromagnetic spectrum has the highest frequency?
A. Frequency is same for the complete spectrum
B. Gamma Radiation Region
C. Radio
D. Visible
4. Electromagnetic waves constitute of
A. Electric and magnetic field varying in space and time sinusoidally and propagating through space such that the two fields are at 60 degrees to the direction of propagation.
B. Electric and magnetic field varying in space and time sinusoidally and propagating through space such that the two fields are perpendicular to the direction of propagation.
C. Electric and magnetic field varying in space and time tangentially and propagating through space such that the two fields are perpendicular to the direction of propagation.
D. Electric and magnetic field varying in space and time tangentially and propagating through space such that the two fields are perpendicular to the direction of propagation.
5. In electromagnetic waves the ratio of amplitudes of electric field and magnetic field is equal to
A. (E0 / 2B0) = c
B. (E0 / B0)1/2 = c
C. (2E0 / B0) = c
D. (E0 / B0) = c
6. Which statement is true about electromagnetic waves?
A. Electromagnetic waves are longitudinal in nature
B. Electromagnetic waves can travel through vacuum
C. Velocity of electromagnetic waves is 3 X 109 m/s
D. Ratio of electric field and magnetic field in electromagnetic field is 2Erms / Brms
7. Which of the following is not a use of electromagnetic wave?
A. In detection of invisible writing
B. In global warming
C. In greenhouses to keep plants warm
D. In warfare for looking through mist and fog
8. Which colour of the visible spectrum has the greatest wavelength?
A. Blue
B. Yellow
C. Red
D. Violet
9. The electric field for an em wave is: E = E0sin[(12 x 1015 t – 4 x 107 x)]. What is the speed of the em waves?
A. 48 x 108 m / s
B. 3 x 108 m / s
C. 4 x 107 m / s
D. 12 x 1015 m / s
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