2023 CGS Phy Prelims P1 w Ans

This paper consists of 19 printed pages (including the cover page). READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces provided at the top of this page and on the optical answer sheet. 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 optical 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. CRESCENT GIRLS’ SCHOOL SECONDARY FOUR PRELIMINARY EXAMINATION PHYSICS 6091/01 Paper 1 28 August 2023 1 Hour Class: Register No: Name:

2 23/S4/6091 − Crescent Prelim 1 The magnitudes of three different electric charges are given below. What is the correct order of size, from smallest to largest? A 1 kC → 1 mC → 1 MC B 1 mC → 1 kC → 1 MC C 1 mC → 1 MC → 1 kC D 1 MC → 1 mC → 1 kC 2 Two forces X and Y act as shown. Which diagram shows the resultant force R of X and Y? A B C D

3 23/S4/6091 − Crescent Prelim 3 Car A and Car B are moving on two parallel straight tracks. Car A starts moving from rest when Car B passes it at t = 0 s. Which statement about the graph is correct? A Car A covers more distance than Car B from t = 0 s to t = 30 s. B Car A covers less distance than Car B from t = 0 s to t = 15 s. C Car B covers more distance than Car A from t = 15 s to t = 30 s. D Car B covers the same distance as Car A from t = 0 s to t = 15 s. 4 The diagram shows a person walking to the left. Which arrow shows the direction of friction acting on the shoe?

4 23/S4/6091 − Crescent Prelim 5 The diagram shows three forces acting on the centre of gravity G of a body which is initially at rest. The 40 N forces make an angle θ with the line GX. What is the subsequent motion of the body? A It accelerates to the left. B It accelerates to the right. C It moves at a constant speed to the left. D It moves at a constant speed to the right. 6 When a heavy coin falls a short distance towards the ground, it does not reach terminal velocity. Which best explains the above? A The coin does not hit the ground. B The weight of the coin equals to the air resistance. C The weight of the coin increases as air resistance increases. D The weight of the coin is always more than the air resistance. 7 A girl is sitting in an aeroplane which takes off and climbs to 12 000 m in a certain time. During this ascent, what happens to the mass and to the weight of the girl? mass weight A decreases decreases B increases increases C unchanged decreases D unchanged increases

5 23/S4/6091 − Crescent Prelim 8 A plastic hollow sphere of mass 60 g has a volume of 100 cm3. What is the maximum mass of sand that may be added to the sphere before it starts to sink in a liquid of density 1.1 g/cm3? A 30 g B 50 g C 60 g D 110 g 9 A car is designed to be stable. To achieve good stability, where is the centre of mass of the car? A above the front wheel B above the rear wheel C as high in the car as possible D as low in the car as possible 10 A uniform beam of weight 30 N has a length of 100 cm. A box of 15 N is placed at the 20 cm mark. The beam can be balanced on a pivot. At which mark should the pivot be placed? A 10 cm B 30 cm C 40 cm D 60 cm

6 23/S4/6091 − Crescent Prelim 11 A mass M is hung from a spring. It is then pulled down slightly and allowed to vibrate vertically between P and Q. Which of the following is correct about the energy in the setup? energy at point P energy at point Q A kinetic kinetic B kinetic potential C potential kinetic D potential potential 12 A weightlifter of 80 kg lifts some masses through a height of 1.7 m. The gravitational field strength is 10 N / kg. During the lift, the gravitational potential energy of the masses increases by 4200 J. What is the total mass lifted? A 25 kg B 250 kg C 330 kg D 2500 kg

7 23/S4/6091 − Crescent Prelim 13 A piston is supported by gas trapped in a cylinder. A weight is put on the piston. The volume of the gas supporting the piston decreases but the temperature of the gas is unchanged. What happens to the molecules? A They have a smaller size. B They have a more kinetic energy. C They hit the piston more frequently. D They move more slowly. 14 A water manometer is connected to a gas supply. One end of the manometer is open ed to the atmosphere. Which statement about the pressure of the gas supply is true? A The pressure is h cm of water. B The pressure is h cm of water above atmospheric pressure. C The pressure is h cm of water below atmospheric pressure. D The pressure is the same as atmospheric pressure.

8 23/S4/6091 − Crescent Prelim 15 A container has two immiscible layers of liquids, L and M. The density of liquid M is twice the density of liquid L. Which graph best shows how pressure varies with the height, d, measured from the bottom of the container? A B C D 16 In an uncalibrated thermometer, the length of a mercury thread is 3.0 cm when immersed in pure melting ice, and 28.0 cm when surrounded by steam from boiling water under normal atmospheric pressure. When placed in a liquid of temperature T C, the length is 18.0 cm. What is the temperature of the liquid? A 37.5 °C B 40.0 °C C 57.0 °C D 60.0 °C

9 23/S4/6091 − Crescent Prelim 17 At a constant temperature, a solid has a fixed shape and a fixed volume. Which of the following describes the shape and the volume of a liquid at constant temperature? shape volume A fixed fixed B fixed not fixed C not fixed fixed D not fixed not fixed 18 Some pollen grains are dropped on the surface of the water in a tank. Which of the following causes the movement of the pollen grains? A bombardment of pollen grains on water molecules B bombardment of water molecules on pollen grains C random motion of pollen grains D random motion of water molecules and pollen grains 19 The diagram shows a frozen pond with the surface of the ice slowly melting as heat is transferred from the warmer air above it. By which processes is the heat transferred from the air to the ice? A conduction, convection and radiation B conduction and convection only C conduction and radiation only D convection and radiation only

10 23/S4/6091 − Crescent Prelim 20 The diagrams show four cans in a cool room. They are painted as shown. One pair is filled with hot water and left to cool down. The other pair is filled with cold water and placed near infra-red heaters. The hot water in the black can cools more quickly than the hot water in the white can. The cold water in the black can heats up more quickly than the cold water in the white can. Which of the following shows the reasons for this? better emitter of infra-red radiation better absorber of infra-red radiation A black black B black white C white black D white white