2022 CWSS Prelim 4NA SCI (PHYSICS) P1 final

COMMONWEALTH SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR NORMAL (ACADEMIC) Name: _____________________________________ ( ) Class: __________ SCIENCE (PHYSICS) Paper 1 Multiple Choice 5105/01 12 Aug 2022 (Fri) 1130 - 1245 Additional Materials: Multiple Choice Answer Sheet Papers 1 and 2: 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips or correction fluid. Write your name, index number and class on the Answer Sheet in the spaces provided unless this has been done for you. There are twenty questions in 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 instructions on the Answer Sheet very carefully. Answers to Paper 1 and Paper 2 must be handed in separately. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no more than 30 minutes on Paper 1. You may proceed to answer Paper 2 as soon as you have completed Paper 1. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate. Setter: Ms Ye Dan This document consists of 8 printed pages and 1 blank page. [Turn over

2 1 Which quantity is a vector? A density B distance C time D weight 2 Two identical balls are released from a building at the same time. One falls from the fifth storey while the other falls from the third storey. Which of the following quantities is the same for both balls? A acceleration B final velocity C time of travel D speed at the second storey 3 A parachutist of weight 600 N falls towards the ground at a constant velocity of 4.0 m/s. What is the resultant force acting on the parachutist? A 0 N B 60 N C 240 N D 600 N 4 A robotic rover has a weight of 186 0 N. The Earth’s gravitational field strength is 10.0 N/kg. When it lands on the Mars, it experiences the Mar’s gravitational field strength of 3.72 N/kg. What is the weight of the rover on the Mars? A 5.00 N B 69.2 N C 50.0 N D 692 N

3 5 A student is standing in a stationary train. The train suddenly starts to move in the direction the student is facing. Which of the following correctly describes and explains what happens to the student? A The student will tend to fall forward, due to his weight. B The student will tend to fall backward, due to his mass. C The student will tend to fall backward, due to his weight. D The student will tend to fall forward, due to his mass. 6 A piece of card has its centre of gravity at point CG. Which diagram shows the piece of card at equilibrium when suspended by a thread? A B C D

4 7 A student has two bags. One has thin straps and the other has thick straps. To carry the same load of his belongings, which bag provides more comfort to his shoulder? bag strap reason A thick more force on his shoulder B thick less pressure on his shoulder C thin more force on this shoulder D thin less pressure on his shoulder 8 A runner runs uphill as she speeds up. Which type of energy decreases as she runs? A chemical potential energy B elastic potential energy C gravitational potential energy D kinetic energy 9 Some water is heated up in a sealed container. What happens to the water molecules when the water is heated? A The number of molecules increases. B The molecules get bigger. C The molecules move about faster. D The molecules vibrate less.

5 10 A marble bench and a wooden bench have been kept in an air -conditioned room at 23 ºC. When a student touches the benches, the marble bench feels colder than the wooden bench. Which of the following is the most likely reason to cause this sensation? A Marble can transfer more coldness than wood. B Marble is a better conductor of heat than wood. C Wood is a poorer insulator of heat than marble. D The marble bench has a lower temperature than the wooden bench. 11 A sample of solid at a temperature of 20°C is heated up. The graph shows the temperature against time as the sample is heated. How long does the change of state take? A 1 min B 2 min C 3 min D 5 min 12 Some statements about boiling and evaporation from a liquid are shown. • Boiling forms bubbles as liquid turns to gas. • Boiling occurs throughout the liquid. • Evaporation occurs only at room temperature. • Evaporation requires an external thermal energy source. • The rate of evaporation is affected by the exposed surface area. How many of these statements are correct? A 1 B 2 C 3 D 4

6 13 A wave is represented in a displacement-time graph. Which row correctly identifies X and Y? X Y A amplitude wavelength B amplitude period C frequency period D frequency wavelength 14 A pebble falls into a pond and produces water waves in the form of circular ripples. The circle lines are lines joining crests of adjacent waves. What is the wavelength of the water wave? A 3 cm B 6 cm C 12 cm D 24 cm

7 15 Which row shows parts of the electromagnetic spectrum in the order of increasing frequency? increasing frequency A X-rays radio waves visible light B X-rays visible light radio waves C radio waves X-rays visible light D radio waves visible light X-rays 16 The arrows S and T show two directions in a circuit. What are the directions of conventional current and electron flow in this circuit? conventional current electron flow A S S B T S C S T D T T 17 A laptop computer is turned on for 2 hours. A current of 2 A goes through it. What is the amount of charge passing through the laptop in the 2 hours? A 4 C B 3600 C C 7200 C D 14400 C

8 18 Four lamps and four switches are connected to a DC power source as shown in the circuit diagram. When all the switches are closed, all the lamps are lit. When one of the switches is then opened, only one lamp goes out. Which switch is opened? 19 A 1500 W air conditioner is turned on for a longer period of time in a month. This results in an increase of $72.00 in the electricity bill. There is no change in the usage of other electrical appliances. Given that the cost of electricity is $0.30 per kWh, how much longer is the air - conditioner turned on in the month? A 0.16 hrs B 6.25 hrs C 160 hrs D 240 hrs 20 An electrical hair dryer is double-insulated. Which diagram shows the correctly wired mains plug for use with the hair dryer? Key: brown wire blue wire yellow and green wire A B C D End of Paper 1

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