2022 XMS P1 AND P2 PRELIM MS

1 Created by Mr. Zhuang HY 4E Prelim 2022 Physics Paper 1 (40 marks) 1 2 3 4 5 6 7 8 9 10 D D B B A C A C D A 11 12 13 14 15 16 17 18 19 20 D B B C D C C A B A 21 22 23 24 25 26 27 28 29 30 A B B C A D C B B A 31 32 33 34 35 36 37 38 39 40 B D A D D B C C B D Paper 2 Section A (50 marks) 1a External diameter = 9.67 cm [1] Internal diameter = 8.18 cm [1] [2] 1b Density is the mass per unit volume of a substance. *Do NOT accept formula as the answer. [1] 1c 3 700 1.54 9.67()32 m V  = =  g cm-3 (2 or 3 s.f) [2] Since the density of the hollow spherical capsule is more than the density of water, it will sink. [1] Working [1] Ans [1] Explain [1] Total [6] 2a As the air is released from the can, the number of air molecules within the can decreases. [1] The frequency of collisions between the air molecules and the walls of the can decreases [1], thus reducing the average force per unit area exerted on the walls of the can [1], causing pressure to decrease. [3] 2b 4 552 1 1 2 2 1 2 4 1 9.4 10(1.0 10 )( ) 5.2 101.8 10 VPV P V P P V − − = → = =     Pa (2 or 3 s.f) Working [1] Ans [1] Total [5]

2 Created by Mr. Zhuang HY 3ai It is the distance between the principal focus and the optical centre of the converging lens. [1] 3aii [1] for correct position and labelling of lens [1] for correct position and labelling of focal point [1] for all three correct light rays [3] 3bi [1] for correct normal and marking of angle of incidence [1] for correct light ray in the lens and exiting the lens [2] 3bii The larger the refractive index, the smaller the focal length. [1] A larger refractive index will cause the light ray to bend more towards the normal as it enters the lens and will bend further away from the normal as it exits the lens , this causing the light ray to cut the principal axis closer to its optical centre. [1] [2] Total [8] 4a The centre of gravity of an object is defined as the point through which its whole weight appears to act for any orientation of the object. [1] lens F i

3 Created by Mr. Zhuang HY 4b Taking moments about his feet, Sum of CW moments = Sum of ACW moments 850 (1.10) (0.50 1.10)F =  + 850 1.10 5801.60F = N (2 or 3 s.f) Working [1] Ans [1] Total [3] 5a Temperature is the measure of the hotness and coldness of a body. OR Temperature is a measure of the average kinetic energy of the particles in the body. [1] 5b 1. The darker the colour of the body, the higher the rate of thermal radiation. 2. The duller the surface of the body, the higher the rate of thermal radiation. 3. The larger the surface area of the object, the higher the rate of thermal radiation. 4. The higher the surface temperature of the surface of the object relative to the surrounding, the higher the rate of thermal radiation. *Any 2, [1] each [2] 5c Rate of heat loss by chamber and a monkey = t cm w aterw ater  = 3600 )2532(42000.3 −