Page 1 CBSE TEST PAPER-01 CLASS - XII PHYSICS (Electro magnetic waves) 1. What is the role of ozone in the atmosphere? [1] 2. What is the nature of waves used in radar? [1] 3. Write the application of Infra-red radiations? [2] 4. Which constituent radiation of the electromagnetic spectrum is used? (1) To photograph internal parts of human body. (2) For air aircraft navigation [2] 5. Electric field in a plane electromagnetic wave is given by E Z = 60 sin ( ) 3 11 10 3 10 / . 2 2 x t V m ? ? + ? ? ? ? (a) Write an expression for the magnetic field (b) What is the magnitude of wavelength and frequency of the wave? [2] 6. In a plane electromagnetic wave, the electric field oscillates sinusoid ally with a frequency of 2 × 10 10 Hz and amplitude 48V/m. (a) What is the wavelength of the em. wave? (b) Calculate the amplitude of the oscillating magnetic field. (c) Calculate average energy density of the electromagnetic field of the wave? [3] 7. Find the wavelength of electromagnetic waves of frequency 6 × 10 12 Hg in free space. Give two applications? [3] 8. A plane monochromatic wave lies in the visible region. It is represented by the sinusoidal variation with time by the following components of electric field Ex = 0, Ey = 4 sin ( ) 2 , x vt p ? ? ? - ? ? ? ? Ez = 0 Where ? = 5 × 10 14 Hg And ? is the wavelength of light. (a) What is the direction of propagation of the wave? (b) What is its amplitude? (c) Compute the component of magnetic field? [3] 9. Write the characteristics of em waves? Write the expression for velocity of electromagnetic waves in terms of permittivity and permeability of the medium? [3]Read More

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