WSSS 2021 Prelim P1

1 West Spring Secondary School PRELIMINARY EXAMINATION 2021 Physics 6091/01 SECONDARY 4 EXPRESS Name ( ) Date 17 Sept 2021 Class Duration 1 hr Additional Materials: 1 OTAS READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper-clips, highlighters, glue or correction fluid. Write your name and shade your index number on the Answer Sheet (OTAS) in the spaces provided. 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 14 printed pages, including this cover page. Setter : Mr Prakash s/o Radakrishna [Turn over

2 1 Which expression has the same SI base units as pressure? 2 Esther has to determine the diameter of a metal sphere using a pair of vernier calipers. Diagram 1 shows the reading when the jaws of the vernier calipers are closed. Diagram 2 shows the reading when measuring the diameter of the metal sphere. What is the actual diameter of metal sphere? A 2.65 cm B 2.73 cm C 2.75 cm D 2.81 cm 3 The diagram shows a pendulum oscillating between positions X and Z. The middle point of the oscillation is Y. The first t ime the pendulum passes through Y , a stopwatch is started. The thirty -first time the pendulum passes through Y, the stopwatch is stopped. The reading is 10 s. What is the period of the pendulum? A 10 15 s B 10 30 s C 10 31 s D 10 60 s 0 1 10 0 10 0 2 3 4 Diagram 1 Diagram 2

3 4 What must be changing when a body is accelerating uniformly? A The speed of the body. B The velocity of the body. C The mass of the body. D The force acting on the body. 5 An object is dropped at time t = 0 from a high building. Air resistance is significant. Three graphs are plotted against time: • the height of the object above the ground, • the speed of the object, • the magnitude of the resultant force on the object. What are the quantities X, Y and Z?

4 6 A train sets off from a station at time t = 0. The graph shows how the distance between the train and the station varies with time. Which statement about the movement of the train between time t 1 and t2 is correct? A Its speed is decreasing and it is moving away from the station. B Its speed is decreasing and it is moving towards the station. C Its speed is increasing and it is moving away from the station. D Its speed is increasing and it is moving towards the station. 7 Which diagram shows the addition of the 4.0 N and the 3.0 N forces? 8 Each diagram shows two forces that are equal in magnitude. Which diagram shows two forces that are a Newton’s third law pair of forces?

5 9 A metal block has a mass of 750 g. Magnesium makes up 60% of the mass and the remaining 40% is copper. The density of magnesium is 1.7 g/cm3. The density of copper is 9.0 g/cm 3. What is the density of the block? A 2.5 g/cm3 B 4.6 g/cm3 C 5.4 g/cm3 D 10.7 g/cm3 10 A uniform horizontal footbridge is 12.0 m long and weighs 4000 N. It rests on two supports X and Y, as shown. A man of weight 600 N stands a distance of 4.0 m from support X. What is the upward force on the footbridge from support X? A 2200 N B 2300 N C 2400 N D 2600 N 11 The diagram shows a barometer which contains mercury and liquid X. The atmospheric pressure is 750 mm Hg and the density of liquid X is 4 3 of the density of mercury. What is h, the height of liquid X? A 110 mm B 150 mm C 200 mm D 250 mm

6 12 A car accelerates up a hill. Which of the following describes the changes in its kinetic energy and gravitational potential energy? 13 A car moves from rest with uniform acceleration along a horizontal road. After travelling a distance of 100 metres, it has kinetic energy equal to 200 000 J. What resultant force is acting on the car? A 100 N B 1000 N C 2000 N D 20 000 N 14 The input power to a lamp is 6.0 W. The lamp wastes 2.7 J of energy in 3.0 s. What is the efficiency of the lamp? A 0.15 B 0.45 C 0.55 D 0.85 15 A partially-inflated balloon is placed inside a bell jar. The bell jar is connected to an air pump. The air pump is switched on and air is removed from the bell jar. What happens to the pressure and to the volume of the gas inside the balloon? kinetic energy gravitational potential energy A B C D unchanged decreases increases increases decreases increases decreases increases

7 16 Which row correctly describes the spacing, ordering and motion of the molecules in water and in ice when both are at a temperature of 0°C? 17 Gas inside a cylinder is heated slowly to a higher temperature and the piston moves outwards. As the volume increases, the pressure of the gas remains constant. What happens to the speed of the gas molecules and their rate of collision with the piston? 18 The following objects all lose heat. Which object loses all of its heat by radiation? A a concrete block with white surface at 100 oC, in air. B a shiny metal satellite at 30 oC, in space. C a metal block with black surface at 40 oC, in air. D the heating element of a kettle at 150 oC, in water. speed of molecules rate of collision A increases stays constant B increases decreases C increases increases D stays constant increases

8 19 Physical properties of materials are used in the measurement of temperature. Which physical property is not suitable for this purpose? A expansion of a metal B mass of a liquid C resistance of a metal D volume of a liquid 20 Which statement about boiling and evaporation of a liquid is correct? A Boiling only occurs at the surface of a liquid. B Bubbles of air are produced throughout the liquid during boiling. C Evaporation is not affected by the surface area of the liquid. D Evaporation occurs at any temperature. 21 The diagram shows a temperature -time graph of two solid substances P and Q. Both substances are heated by the same heat source and results plotted on the same axes. Which of the following about the two substances is correct? 22 The diagram shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right. Which one of the following correctly shows the directions of the velocities of the poi nts X, Y and Z on the string?

9 23 A transverse wave in a medium has the waveform shown, where y = vertical displacement and x = horizontal distance. The speed of the wave is 20.0 cm/s. A particle of the medium oscillates vertically. Which graph of vertical displacement y against time t best represents the motion of this particle? 24 A ray of light is incident on a piece of glass block as shown in the diagram.