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                                                    Osb India Optics DPP Class 10  1. In reflection of light the angle of reflection is a) equal to angle of incidence b) greater than angle of incidence c) less than angle of incident d) Both (a) &(b) 2. When light travel from  air to glass it a) bend away from normal b) bend towards the normal c)does not bend d)none of these 3. Refraction causes due  to a) change in wavelength of light b) change in speed of light c) change in frequency of light d) Both (a) & (c) 4. The correct relationship between refractive index and speed of light is a) u=c/v b) u = v/c c) u=v×c d) u=v+c 5. The speed of light in water is 2.25 ×10^8 m/s then refractive index of water is a) 2.32 b)1.03 c)1.33  d)2.33 6. The refractive indices of kerosene oil, water and turpentine oil are 1.44, 1.33, 1.47 ...

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  1. In the electrolysis of water, a) Name the gas collected at anode and cathode b) Why is the volume of gas collected at one electrode double than the other? c) What would happen if dil H 2 SO 4 is not added to water? ( 3 Marks) 2. While writing chemical equations for such reactions, where are these conditions usually mentioned? A. above the arrow B. along with products C. below the plus signs D. before the reactants ( 1 Marks) 3. Chemical equations are balanced to reflect that ___________________. A. matter can change its state during chemical reactions B. matter cannot be created or destroyed during chemical reactions C. heat is an important input in chemical reactions D. all chemical reactions are always reversible (1 Marks) 4. Which of the following is TRUE about a combination reaction ? A. The number of reactants is always greater than the number of products. B. The number of products is always greater than the number of reactants. C. The number of products is alway...

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