Sample Paper – 2012 Class – X Subject – Physics Marks: 25 Time : 1 ½ hour General Instructions: (i) All questions are compulsory. (ii) Question No. 1 to 3 in section A are very short answer type questions carrying one mark each. The questions are to be answered in one word or a sentence. (iii) Question No. 4 to 6 in section A are short answer type questions carrying two marks each. Their answers may not normally exceed 40 words each. (iv) Question No. 7 and 8 in section A are also short answer type questions carrying three marks each. Their answers may not normally exceed 60 words each. (v) Question No. 9 in section A is long answer type question carrying five marks (vi) Questions number 10 to 14 in Section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you. SECTION A 1. Out of convex mirror and concave mirror, whose focus is situated behind the mirror? 2. Copy the diagram to your answer book and show the image formation. 3. Name the part of human eye which is responsible for the colour of eye. 4. A thin lens has a focal length of –25 cm. What is the power of the lens? Is it convex or concave? 5. Focal length of a concave mirror and a convex lens are obtained using a red light source, what change you will observe, if the red light source is replaced by a blue light source? Give reason. 6. A person cannot read books if it is kept at a distance shorter than 40 cm. calculate the power of lens required for correction. Is it a converging or diverging lens? 1. (a) Copy the diagram to your answer book and complete the ray diagram and mark the following (i) Angle of incidence (ii) Angle of emergence (iii) Angle of deviation (b) Name the factors on which angle of deviation depend. (c) What will happen if the monochromatic red light is replaced with a white light? 2. Explain the following terms (i) Tyndall Effect (ii) Scattering of light (iii) Dispersion of light (iv) Power of Accommodation (v) Absolute refractive index Section B 3. A ray of light in glass is incident on a boundary with air. Which path does the ray of light take when the angle of incidence i is less than the critical angle? 1. A 2. B 3. C 4. D
Posted on: Wed, 28 Aug 2013 06:13:24 +0000
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