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ICSE Class X Mid-term 2025 : Physics

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G V RAO Physicist
Osmania University (OU), Hyderabad

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ST. PATRICK S ACADEMY, BENGALURU MIDTERM I RE-EXAMINATION 2025-26 Class: X Max. Marks: 20 Date: 04/06/2025 Duration: 40 min (Answer all the questions) Question 1 The refractive index of diamond is 2.4. If the velocity of light in air or vacuum is 3 108 m s 1, Find the velocity of light in diamond. [2] Question 2 The following figure shows red light passing through a triangular glass block. [2] Blue light incident on the triangular glass block along the same path as the green light. Draw the path of the blue light within the triangular glass block. Question 3 The following figure shows three rays of red light each entering a semi-circular glass block.[4] Figure 1 Figure 2 Figure 3 Answer the following questions based the above given data Complete the path of each ray of red light and name the phenomena shown by light in each case. Page 1 of 2 Question 4 The diagram shows a ray of light being totally internally reflected at the boundary between substances A and B. [2] (1) Which row in the table must be true? Option a) b) c) d) Angle of incidence Less than critical angle greater than critical angle Less than critical angle greater than critical angle Substance B smaller refractive index than B greater refractive index than B greater refractive index than B smaller refractive index than B (2) Give reason for your answer Question 5 (1) Which among the two lenses with power L1= -3D and L2= 4D respectively can form a real image? [1] a) only the lens with power -3 D b) only the lens with power 4 D c) both the lenses d) neither of the lenses (2) Give reason for your answer in (1) [1] (3) Show with the help of diagram, how these two lenses differ in terms of thickness. [1] (4) Calculate the minimum object distance for which the lens L2 forms real image? [2] Question 6 A convex lens forms a real image on a screen when an object is placed at 10 cm from the screen. On shifting the lens by 2 cm, a real image is again formed on the screen. Find the focal length of the lens. [3] Question 7 A coin placed in a beaker containing water appears at a depth of 10 cm from the water surface. What is the real depth of the coin? Refractive index of water = 4/3. [2] This paper ends here Page 2 of 2

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