Title 10 Sci Electricity Notes.pdf ✅

3. (a) A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it. (b) Why do stars twinkle? Explain. (CBSE 2018) 4. (a) Write the function of each of the following parts of human eye: (i) Cornea (ii) Iris (iii) Crystalline (iv) Ciliary muscles (b) Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an astronaut on the Moon? Give reason to justify your answer. 5. (a) A student suffering from myopia is not able to see distinctly the object placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams explain. (i) Why the student is unable to see distinctly the objects placed beyond 5 cm from his eyes. (ii) The type of the corrective lens used to restore proper vision and how this defect is correct by the use of this lens. (b) If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention. 180 181 Electric Current What is it It is the rate of flow of electric charges (electrons) in a conductor. Mathematically I = Q t Experimentaly Measured by an ammeter How is it connected always in series in a circuit through which we measure current What is a circuit Electric circuit is a continuous and closed path of an electric current. Direction of current flow in circuit Positive terminal of the cell to the negative terminal Where Q is the net charge that flows across cross-section of a conductor in time. Ampere SI unit Source: EDUDEL For more free DOWNLOADS, visit www.aspirationsinstitute.com
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