UNIQUE SCIENCE ACADEMY

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1 1 UNIQUE SIENE EMY Test (Unit 1-15) Name :... Paper: Physics ate : ode: 5054 lass: II Time llowed: 5Minutes Maximum Marks: 25 1 Theory Section: [Total 16 Marks] Fig.1.1 shows three wavefronts in a beam of yellow passing through air. The wavefronts are one wavelength apart. The beam meets a glass surface. is a ray of that shows the direction of travel of the wavefronts. wavefront wavefront 2 wavefront 1 air glass (a) (b) Fig. 1.1 omplete Fig. 1.1 by (i) continuing the ray to show the ray inside the glass, (ii) continuing wavefront 1 inside the glass. [2] State what happens to the speed and wavelength of the waves as the beam moves from the air to the glass. (i) speed... (ii) wavelength...[2] (c) The beam of yellow in Fig. 1.1 is replaced with a beam of. escribe two ways in which the completed Fig. 1.1 would change [2] [Total 6] edicated to My Son Mohammad Irtaza Haider Zain. ode 5054 [Turn over

2 2 (a) small object S is dipped repeatedly into near a flat reflecting surface. 2 Fig. 2.1 gives an instantaneous view from above of the position of part of the waves produced. reflecting surface S (b) Fig. 2.1 On Fig. 2.1, (i) put a clear dot at the point from which the reflected waves appear to come (label the dot R), (ii) draw the reflected portion of each of the three waves shown. [] Fig. 2.2 shows a small object P in front of a plane mirror M. M P Fig. 2.2 On Fig. 2.2, carefully draw two rays that show how the mirror forms the image of object P. Label the image I. [] [Total: 6]

3 Fig..1 and Fig..2 show wavefronts of approaching a plane mirror and a rectangular glass block, respectively. direction of travel of wavefronts mirror Fig..1 direction of travel of wavefronts glass block Fig..2 In Fig..2, the waves approaching the block have a speed of m/s and an angle of incidence of 70. The refractive index of the glass of the block is 1.5. (i) alculate the speed of waves in the block. (ii) alculate the angle of refraction in the block. speed =... [2] 1 angle =... [2] [Total 4] MQ SETION: [Total 9 Marks] Which type of radiation lies between and microwaves in the electromagnetic spectrum? - waves - s

4 2 4 The diagram shows a cork with a weight attached so that the cork floats upright. cork surface X Y weight Transverse waves travel across the from X to Y. Which way do the waves make the cork move? right and left only to the right up and down only to the left Waves travel more slowly on the surface of when the is. person drops a stone into a pool at X. The diagram shows the first wavefront on the surface of the pool. Which region of the pool is likely to be most? X wavefront

5 4 5 Waves move from to where they are slower. Which diagram shows what happens to the waves? 5 The diagram shows the image of a clockface in a plane mirror. Which of these times is shown? Rays of enter and leave a box. ray 1 ray 2 ray 1 ray 2 7 What could be inside the box to make the rays behave as shown? a converging lens a plane mirror a parallel-sided glass block a triangular prism The diagram shows a wave. displacement 0 distance X How many wavelengths are there between X and Y? Y

6 6 8 Which diagram correctly shows the paths taken by and when a beam of enters a glass prism? 9 Which diagram shows the correct order of the waves in the electromagnetic spectrum? MQ nswer Sheet edicated to Mohammad Irtaza Haider Zain. ode 5054