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Class 10 Exam 2014 : Physics (Delhi Public School (DPS), Newtown, Kolkata)

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DE ELHI PUB BLIC SCH HOOL NEW WTOWN KOLKA ATA SE ESSION 20 013-2014 SELECT TION EX XAMINAT TION CLASS S : X-SET A SUBJE ECT : PHY YSICS FULL MA F ARKS : 80 T TIME : 2H HOURS An nswers to th his Question Paper must t be written on the paper provided separately. s Yo ou will not be e allowed to o write durin ng the first 15 1 minutes. This time is s to be spent in reading the t Question n Paper. The e time given n at the head d of this Pap per is the tim me allowed for fo writing th he answers. Section n A is compu ulsory. Attem mpt any four r questions from f Section n B. T intended The d marks for questions or r parts of qu uestions are given in bra ackets [ ]. estion paper r consists of f 4 printed pa ages. This que SECT TION A (4 40 Marks) Atte empt allquestions from this section n Question n1 (a) Write W two co onditions for hearing a distinct ech ho. (b) A woman dr raws water from f a well using a fixe ed pulley. The mass of the t bucket and a w water togeth her is 6.0kg. The force applied a by the t woman is i 70N. Calc culate the 2 m mechanical advantage. a ( (g=10m/s ) (c) For F the same e kinetic ene ergy of a bo ody, what sh hould be the e change in its velocity if its m mass become es four time es? (d) Give G the dire ections of in nduced curr rent in th he following g figures. Mention two o characteristics of a go ood (e) M em mitter. 2+2+2+2+2= =10] [2 Question 2 (a) X does 500J of work in h and Y do oes 600J of work w in h. What will be b the ratio of th he power de elivered by X and Y . (b) Name N the pr rinciple whic ch the optic cal fibre is based b on. Why W is that principle p use ed? (c) If f the amplit tude of a wa ave is tripled d, what will l be effect on n its loudness? Give re easons. (d) Distinguish D between b step p-up and step-down tra ansformer. (e) State two pre ecautions th hat must be taken while e handling a radioactiv ve source. [2 2+2+2+2+2= =10] n3 Question (a) Mention M any y two charac cteristics of f non-contac ct forces. 1

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