11 SMSS 2010 P1 WorkedOutAns

Secondary 4 Express 17th September 2010 Duration : 1 hour Total Marks : 40 READ THESE INSTRUCTIONS FIRST Do not open this Booklet until you are told to do so. Write in soft pencil. Write your name and index number on the answer sheet provided. Do not use staples, paper clips, highlighters, glue or correction fluid. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C, and D. Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. When necessary, assume the acceleration due to gravity, g to be 10 m/s2. ________________________________________________________________________ This question paper consists of 15 printed pages PHYSICS 5058/01 St. Margaret’s Secondary School Preliminary Examinations 2010 [Turn over

2 1 The dimension of a rectangular block of wood is measure as 130 mm, 4.0 mm and 3.21 mm. What are the measuring instruments used to obtain such readings? (i) metre rule (ii) vernier calipers (iii) micrometer screw gauge A (i) and (ii) only B (i) and (iii) only C (ii) and (iii) only D (i), (ii) and (iii) 2 Given that Newton’s Law of Gravitation is given by 2 21 r mGmF= where m 1 is the mass of particle 1, m 2 is the mass of particle 2, F is the gravitational force, r is the distance between the two particles and G is the universal gravitational constant. Which of the following is the unit for G? A kg3m3s2 B kgs2/m3 C m3/kgs2 D kg3m3/s2 Answer Question 3 and 4 based on the information given below. A stream is 30 m wide and its current flows southward at 1.5 m/s. A toy boat is launched with a velocity of 2.0 m/s eastward from the west bank of the stream. 3 What is the magnitude of the boat’s resultant velocity as it crosses the stream? A 0.5 m/s B 2.1 m/s C 2.5 m/s D 3.5 m/s 4 How far southward will the boat have traveled upon reaching the opposite bank? A 18.0 m B 22.5 m C 30.0 m D 37.5 m

3 5 Two stones, A and B, are thrown horizontally from the top of a cliff. Stone A has an initial speed of 15 m/s and stone B has an initial speed of 30 m/s. There is negligible air resistance. Compared to the time it takes stone A to reach the ground, the time it takes stone B to reach the ground is A half as great. B the same. C twice as great. D four times as great. 6 An object is pulled at a constant speed across a rough surface. Which of the following statements about friction is true? A The magnitude of the frictional force is greater than the driving force. B The magnitude of the frictional force is less than the driving force. C The magnitude of frictional force is equal to the driving force. D The magnitude of the frictional force is equal to the resultant force. 7 The diagram shows a system in equilibrium consisting of an object of weight W that hangs from two ropes. The tensions in the ropes are T1 and T2. Which of the following are correct values of T1 and T2? T 1 T 2 A T2 sin 60° °60cos W B T2 sin 60° °60sin W C °60tan W °60cos W D °60tan W °60sin W T1 T2 W

4 8 The diagrams show a rectangular box with inside measurements of 5 cm × 6 cm × 4 cm. The box has a mass of 40 g when empty. When filled with a liquid, it has a total mass of 220 g. What is the density of the liquid? A 3cm/g)465( 220 ×× B 3cm/g)465( 40220 ×× − C 3cm/g220 )465( ×× D 3cm/g40220 )465( − ×× 9 The diagram shows a uniform metre rule of mass 0.60 kg balanced horizontally. The mass of A is 0.40 kg. What is the tension T in the string? A 6.7 N B 10.0 N C 11.7 N D 14.0 N

5 10 The diagram below shows an object tilted such that it is at the point of falling over. Where would be the likely position of the centre of gravity of the object? 11 Water of density 1000 kg/m 3 fills up to 30 cm in a container. The base of the container is broken accidentally and water starts to leak from a tiny hole of area 1.0 mm 2. To prevent water from leaking, a sticky tape is used to cover the tiny hole. Determine the minimum force that the tape must be able to withstand. A 0.003 N B 0.3 N C 30 N D 3000 N 12 The diagram shows a 2 kg block, starting from rest, slides 20 m down a frictionless inclined plane from X to Y, dropping a vertical distance of 10 m. Determine the magnitude of the net force on the block while it is sliding. A 1 N B 5 N C 10 N D 20 N 13 An object is thrown downwards with a speed of 10 m/s from a cliff that is 120 m above ground. If air resistance is negligible, determine th e time taken for the object to fall to the ground from the cliff. A 4.0 s B 4.1 s C 4.8 s D 6.0 s

6 14 When a bullet of mass 20 g moving at 400 m/s strikes a fixed wooden block of thickness 0.030 m, it emerges with a speed of 200 m/s as shown in the diagram. What is the retarding force of the wood? A 66.7 N B 13300 N C 40000 N D 53300000 N 15 Gas inside a cylinder is heated slowly to a higher temperature. The pressure inside the cylinder remains constant as the piston moves outwards. How do the speed of the gas molecules and their rate of collision with the piston compare with their initial values at the lower temperature? speed of molecules rate of collision A greater greater B greater reduced C greater same D same greater cylinder gas molecule piston air 400 m/s 200 m/s 0.030 m

7 16 Which of the following contains the molecules with the highest average speed? A B C D 17 The diagram shows a section through a particular type of building board. Which statement best explains why such a board provides good thermal insulation? 18 Fang Fang tried to use a thermistor as a thermometer. She found that when the temperature was 200 °C, the resistance of the thermometer was 250 Ω and when the temperature was 50 °C, the resistance of the thermometer increased to 500 Ω. What would be the temperature when the resistance of the thermistor is 600 Ω? A -60 °C B -40 °C C -10 °C D 10 °C Aluminium foil is a Expanded polystyrene is a A good conductor poor reflector B poor reflector poor conductor C good conductor good reflector D good reflector poor conductor wood at room temperature water at room temperature ice cube at –10°C steam at 110°C

8 19 A cup of hot coffee of mass 200 g is at an initial temperature of 80 °C. Given that wind, at an initial temperature of 20 °C, is blowing across the cup at a rate of 1.0 kg/s. After moving over the cup, the temperature of the wind increases to 25 °C. If the specific heat capacity of coffee is 4.0 kJ/kg°C and that of air is 200 J/kg°C, compute the time necessary to cool the cup of coffee to 50 °C. A 0.024 s B 4.8 s C 24 s D 40 s 20 Which of the following increases when a liquid becomes a gas at its boiling point? A the average kinetic energy of the molecules B the molecular size C the molecular spacing D the total number of molecules 1.0 kg/s 200 g

9 21 The diagram shows the motion of a wave in a ripple tank. What are the amplitude and frequency of this wave? 22 A vertical stick is dipped in and out of the water at P. It takes two seconds to travel from P to Q. Which of the following statement is true? A The frequency of the waves is 1.5 Hz. B Distance X is the amplitude of the waves. C Distance Y is the wavelength of the waves. D The wave formed is a longitudinal wave. amplitude / cm frequency / Hz A 2 2