2022 XMS P2 PRELIM QP

2 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use Section A Answer all questions in this section. . 1 Fig. 1.1 shows a cross -sectional view of a hollow spherical capsule made from a certain material. Fig. 1.1 Fig. 1.2 and Fig. 1.3 show vernier calipers readings of the external and internal diameters of the hollow sphere capsule respectively. (a) State the external and internal diameter s of the cross-section of the hollow spherical capsule. External diameter = …………………………. Internal diameter = …………………………. [2] (b) Define density. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. [1] (c) The hollow spherical capsule has a mass of 700 g, and the mass of air in it is negligible. Given that the density of water is 1.0 g cm -3, explain whether the hollow spherical capsule will float or sink when placed in water. Show your working clearly in the space below. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. [3] Fig. 1.2 Fig. 1.3

3 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use 2 Fig. 2.1 shows a can of compressed air that is being used to blow dust off a computer keyboard. Fig. 2.1 (a) The pressure of the air inside the can is greater than the pressure of the atmosphere. Explain, in terms of molecules, why the pressure of the air inside the can decreases as it is used. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. [3] (b) A student uses an inverted measuring cylinder in a water trough to measure the volume that the air in the can occupies at atmospheric pressure. Fig. 2.2 shows the measuring cylinder gradually being filled with air from the can. Fig. 2.2 Initially, the inverted measuring cylinder is full of water. The student presses the top of the can and air passes through the rubber tubing into the inverted measuring cylinder. The air gradually replaces the water in the cylinder until no more air can leave the can. The final temperature of the air is equal to its initial temperature. The volume of the air inside the can is 1.8 × 10 −4 m3. The student observes that, at an atmospheric pressure of 1.0 × 10 5 Pa, the total volume of the air in the measuring cylinder, the can and the tubing is now 9.4 × 10−4 m3.

4 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use Determine the original pressure of the air in the can. Pressure = …………………………. [2] 3 (a) (i) Define the focal length of a converging lens. ……………………………………………………………………………………. ……………………………………………………………………………………. [1] (ii) Fig. 3.1 shows an object O placed on a line that passes through the centre of a converging lens. The lens is perpendicular to the line but is not shown. Fig. 3.1 A diminished, real image of the object is produced by the lens. On Fig. 3.1, 1. draw and label the lens in a suitable postion, and mark with the letter F one focal point of the lens, 2. draw three rays of light from the top of the object to the image. [3]

5 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use (b) Fig. 3.2 shows a ray of red light as it strikes the curved surface of a converging lens at A. Fig. 3.2 (i) On Fig. 3.2, • draw the normal at A, • mark the angle of incidence at A with the letter i, • draw the ray in the lens and in the air on the other side of the lens. [2] (ii) The refractive index of glass for red light is 1.52 and for blue light is 1.55. Suggest and explain what effect thi s difference in refractive indices has on focal length. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. [2] 4 Fig. 4 shows an athlete in the midst of a push -up as part of his strength training. The athlete weighs 850 N. His centre of gravity is at a distance 1.10 m from his feet and 0.50 m from his hands. Fig. 4 (a) Define centre of gravity. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. [1] 1.10 m 0.50 m

6 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use (b) Determine the magnitude of the force acting on the athlete’s hands when he is in the position shown in Fig. 4. Magnitude of force = …………………………. [2] 5 In order to determine the rate at which a monkey loses thermal energy, it is placed in a chamber through which water is circulated as shown. The steady outlet temperature was recorded as 32 ˚C whe n the rate of flow of water was 3.0 kg h-1 and the inlet temperature was 25 ˚C. When another monkey was added to the same chamber, the rate of flow of water had to increase to 7.0 kg h-1, in order to achieve the same inlet and outlet temperatures. Assume that each monkey lost thermal energy at constant rate, and the rate of loss of thermal energy from the chamber by other means remains constant. (a) Define temperature. ………………………………………………………………………………………..…. [1] (b) The main process of heat transfer from the monkey is thermal radiation. Describe two factors, in general, that could increase the rate of thermal radiation from an object. 1. ………………………………………………………………………………………... ………………………………………………………………………………………..…. 2. ………………………………………………………………………………………... ………………………………………………………………………………………..…. [2] Water goes in at 25 ˚C Water comes out at 32 ˚C

7 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use (c) Calculate the rate of loss of thermal energy of the second monkey . (Specific heat capacity of water = 4 200 J kg-1 K-1) Rate of loss of thermal energy of the second monkey = …………………………. [4] 6 The displacement-distance graph of a wave in a string at an insta nt in time is shown in Fig. 6. Fig. 6 The wave has a frequency of 2.0 Hz. (a) Calculate the distance travelled by the wave in 0.060 s. Distance = …………………………. [2] (b) On Fig. 6, draw an arrow on particle P to show the direction of its motion in the next instant of time. [1]

8 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use 7 Table 7 shows the typical wavelengths of electromagnetic waves. Electromagnetic wave Typical wavelength radio wave 3.0 m microwave 0.030 m X 100 µm Y 600 nm Z 10 nm X-rays 0.10 nm gamma ray 0.0010 nm Table 7 (a) State the name of electromagnetic wave Y. ………………………………………………………………………………………..…. [1] (b) State one use for electromagnetic wave Z. ………………………………………………………………………………………..…. [1] (c) Calculate the frequency of electromagnetic wave X. Frequency = …………………………. [1] (d) State one difference between sound waves and electromagnetic waves. ………………………………………………………………………………………..…. [1] 8 An electron travels horizontally towards a vertical uniform electric field formed by a pair of parallel metal plates as shown in Fig. 8. Fig. 8 +100 V -100 V

9 6091/Physics/Paper 2/2022 Preliminary Exam For Examiner’s Use (a) Define electric field. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. [1] (b) On Fig. 8, (i) draw the electric field pattern between the plates, [2] (ii) complete the path of travel of the electron through the plates. [1] 9 A solenoid is placed in between two magnetic bars that are freely suspended from the