# Phy_Extended Paper 3_without Annotations

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© OUP: this may be reproduced for class use solely for the purchaser’s institute IGCSE Sample Examination PaperPHYSICS PAPER 3 Extended   1 hour 15 minutes Candidate Name: The questions in this sample were taken from Cambridge IGCSE Physics 0625 Paper 3.Question 1: Variant 1 May 2008 Q1Question 2: May 2008 Q2Question 3: November 2008 Q3Question 4: November 2008 Q5Question 5: May 2008 Q6Question 6: November 2007 Q7 Question 7: May 2009 Q8Question 8: November 2007 Q9Question 9: May 2009 Q10Question 10: May 2008 Q10Question 11: May 2008 Q11 Answer questions on the Question Paper.Answer all  questions.  2 © OUP: this may be reproduced for class use solely for the purchaser’s institute 1 The diagram below shows the speed-time graphs for two falling balls. 0 1 2 3 4 50102030time/sm/sspeed rubber ballplastic ball   Both balls fall from the same height above the ground. a Use the graphs to ﬁnd i the average acceleration of the falling rubber ball during the ﬁrst 3.0 s. [2] ii the distance fallen by the rubber ball during the ﬁrst 3.0 s. [2] iii the terminal velocity of the plastic ball. [1] b Both balls have the same mass but the volume of the plastic ball is much greater than that of the rubber ball. Explain, in terms of the forces acting on each ball, why the plastic ball reaches a terminal velocity but the rubber ball does not. [3] c The rubber ball has a mass of 50 g. Calculate the gravitational force acting on the rubber ball. [2][Total: 10]   3 © OUP: this may be reproduced for class use solely for the purchaser’s institute 2 a Name the process by which energy is released in the core of the Sun. [1] b Describe how energy from the Sun becomes stored energy in water behind a dam. [3] c Data for two small power stations is given in the table below. input to power stationoutput of power station gas-ﬁred100 MW25 MWhydroelectric90 MW30 MW i State what is meant by the  efﬁciency  of a power station. [1] ii Use the data in the table to explain that the hydroelectric station is more efﬁcient than the gas-ﬁred power station. [1] [Total: 6]  4 © OUP: this may be reproduced for class use solely for the purchaser’s institute 3 a A submarine descends to a depth of 70 m below the surface of water. The density of the water is 1050 kg/m 3 . Atmospheric pressure is 1.0 󰀳  105 Pa. Calculate i the increase in pressure as it descends from the surface to a depth of 70 m. [2] ii the total pressure on the submarine at a depth of 70 m. [1] b On another dive, the submarine experiences a total pressure of 6.5 󰀳  105 Pa. A hatch cover on the submarine has an area of 2.5 m 2 . Calculate the force on the outside of the cover. [2] c The submarine undergoes tests in fresh water of density 1000 kg/m 3 . Explain why the pressure on the submarine is less at the same depth. [1][Total: 6]

Jul 23, 2017

#### CASE 4 (Module)

Jul 23, 2017
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