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. Th