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PRE-BOARDEXAMINATION2020-21 PHYSICs CLASS-X M.M:80 TIME: 2 HRS SECTION-A (40MARKS) *Attempt all questions **Each question carries 2 Q1. (i) Which has more marks. heat: Ig of ice at 0 C or lg of water at 0C. Give reason. (ii) Write the (ii) Write the latent heat of ice. approximate value ofspecific prineiple of calorimetry and also write the mathematical statement. the electricity. (iv) Write two safety precautions while using (v) Define high tension wires. (vi) What do you mean by Joule's law of heating? in electrical (vii) Why power and voltage is mentioned appliance? (viii) On what factors does the internal resistance of a cell depends. superconductors and also write temperature. (ix) Define two examples with (x) Explain specific resistance and its unit. (xi) Define Ohm's law and its limitations. Write condition for resonance. (xii) Write three conditions to hear echo distinctly. (xiv) Write two uses of ultraviolet radiations. (xv) Which colour of the white light is deviated by the glass (xii) prism. (a) The most (b) the least (1)
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