2022 XMS P1 PRELIM QP

2 6091 / Physics / Paper 1 /2022 Prelim Exam 1 A pair of vernier calipers is used to measure the radius of a button battery. What is the radius of the button battery? A 0.62 cm B 0.65 cm C 0.72 cm D 0.75 cm 2 The graph below shows how the height of a swinging pendulum bob changes with time. What is the period of the oscillation? A 1.5 s B 3.0 s C 4.5 s D 6.0 s 3 Alex is jogging at constant speed beside a road. He sees the traffic lights in front of him turn amber, so he begins to jog at a lower constant speed. Which distance-time graph illustrates Alex’s motion? A B C D 4.5 s 0.50 time / s 0.20 height / m

3 6091 / Physics / Paper 1 /2022 Prelim Exam 4 The acceleration of free fall on a particular planet is 8.0 m s-2. An object was dropped from rest and hit the ground after 1.5 s. Air resistance is negligible. From what height was the object dropped? A 6.0 m B 9.0 m C 12 m D 18 m 5 A rubber ducky is released from the bottom of a pool of water. Almost immediately, it rises at a constant speed to reach the surface of the water. Which of the following best describes the resultant force acting on the rubber ducky? A zero B upwards and equal to the rubber ducky’s weight C upwards and greater than the rubber ducky’s weight D upwards and less than the rubber ducky’s weight 6 P, Q and R are three identical blocks resting on a smooth surface. The blocks are connected by inelastic strings and a force of 30 N is applied on the right side of block R. What are the tensions T1, between blocks P and Q, and T2, between blocks Q and R, in the strings? T1 T2 A 15 N 15 N B 30 N 30 N C 10 N 20 N D 7.5 N 15 N 7 When a balloon is released, it rises in the air. It will eventually stop rising once it reaches a certain height H from the ground. Why is this so? A The density of the air in the balloon is the same as the density of the atmosphere at H. B The gravitational force acting on the balloon is stronger at H than at sea level. C The normal contact force on the balloon becomes zero. D The size of the balloon decreases due to a decrease in its weight. P Q R 30 N T1 T2

4 6091 / Physics / Paper 1 /2022 Prelim Exam 8 Rachael pivots a 120 cm rod of negligible mass at the 40 cm mark. She then applies two weights and a spring at three positions of the rod. What is the resultant moment acting on the rod? A 8 Nm anti-clockwise B 14 Nm clockwise C 18 Nm anti-clockwise D 32 Nm clockwise 9 The diagrams below show four pointers attached freely to the centre of a circular board at different orientations. Which board has its pointer in stable equilibrium? 10 When a force of 5.0 N is exerted on an object, the object moves at a constant speed of 0.20 m s-1 for 50 m. What is the power exerted on the object? A 1.0 W B 50 W C 250 W D 1250 W 11 A ball of mass 2 kg is dropped from rest and falls freely from a height of 40 m. At a particular instant, the speed of the ball is 10 m s-1. Take gravitational field strength as 10 N kg-1. What is the height of the ball from the ground at this instant? A 5 m B 20 m C 30 m D 35 m A B C D

5 6091 / Physics / Paper 1 /2022 Prelim Exam 12 A forklift is used in a supermarket to move heavy groceries. There is a hydraulic system in the forklift, in which the hydraulic liquid is incompressible. A mover needs to apply a downward force at piston E (foot pedal) to lift groceries on piston D (fork). What is the downward force needed at piston E to lift a 80 N sack of potatoes on piston D? A 1 N B 4 N C 80 N D 1600 N 13 Fig. 13.1 shows a closed J-tube trapping 5.0 cm³ of air with some mercury. Fig. 13.2 shows the J-tube after more mercury is poured in until the mercury levels differ by 76 cm. Fig. 13.1 Fig. 13.2 What is the volume of trapped air in Fig. 13.2 if the atmospheric pressure is 76 cm Hg? A 0.4 cm3 B 2.5 cm3 C 5.0 cm3 D 10.0 cm3 14 The Brownian motion of smoke particles is caused by A collisions between air molecules. B collisions between smoke particles. C collisions between smoke particles and air molecules. D convection currents in the air.

6 6091 / Physics / Paper 1 /2022 Prelim Exam 15 An experiment is conducted to determine the relationship between the volume V of a fixed mass of gas and the gas pressure P in a closed container. Temperature of the gas is kept constant. Which PV against V graph is correct? 16 A man stands beside a campfire and feels warm immediately. How does thermal energy from the campfire reach the man? A by convection B by conduction and convection C by radiation D by conduction and radiation 17 Which statement is not true about boiling and evaporation? A Boiling is a fast process while evaporation is a slow process. B Boiling happens throughout the liquid while evaporation happens at the surface. C Boiling occurs at 100 °C while evaporation happens at any temperature between 0 °C to 100 °C. D In boiling, the average internal energy of the liquid increases while in evaporation, the average internal energy of the liquid decreases. 18 What is the temperature difference between the melting point of ice and boiling point of water? A 100 K B 173 K C 273 K D 373 K

7 6091 / Physics / Paper 1 /2022 Prelim Exam 19 Ben found an old thermometer where the markings for the reading have faded. He placed it in melting ice and found the length of the mercury thread to be 5.0 cm. He then placed it in steam and the length of the mercury thread was 25.0 cm. Lastly, he placed it in a beaker of chemical and the length of the mercury thread was 11.0 cm. What is the temperature of the chemical? A 24 °C B 30 °C C 44 °C D 55 °C 20 In general, coastal areas experience smaller changes in temperature as compared to inland areas. This is because of the A high heat capacity of water. B high specific latent heat of fusion of water. C low specific latent heat of vaporisation of water. D low thermal conductivity of water. 21 A lump of ice is put inside a glass of water. The ice has mass 100 g and temperature -10 oC. The water has mass 240 g and temperature 60 oC. specific heat capacity of ice = 2100 J / kg.oC specific heat capacity of water = 4200 J / kg.oC specific latent heat of fusion of ice = 0.336 MJ / kg What is the lowest possible temperature of the remaining water? A 17.3 oC B 18.8 oC C 24.6 oC D 59.0 oC

8 6091 / Physics / Paper 1 /2022 Prelim Exam 22 A water wave is travelling towards the right. Which of the following is/are correct? 1 Amplitude of the wave is represented by the distance XY. 2 Particle at X will move to Z after a quarter of a period. 3 Wavelength of the wave is represented by the distance XW. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 3 only 23 A ripple tank is used to demonstrate refraction of plane water waves. Waves in shallow water have a wavelength of 1.1 cm. Waves in deeper water have a wavelength of 1.5 cm and a speed of 12 cm s-1. What is the speed of the waves in the shallow water? A 7.3 cm s-1 B 8.8 cm s-1 C 16 cm s-1 D 20 cm s-1 X W Z Y

9 6091 / Physics / Paper 1 /2022 Prelim Exam 24 A plane mirror is placed at a tight and sharp turn leading to a lift lobby. Who can the observer see in the plane mirror? A P only B P and Q only C Q and R only D P, Q and R 25 Two different lenses are used to capture the image of an object. Which row describes the characteristics of these images? image from lens X image from lens Y A bright