2021 Prelim Phy P1

Name : Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 27 September 2021 1 hour READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are thirty 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. © DHS 2021 9749/01 [Turn over This document consists of 25 printed pages and 1 blank page. This document consists of 17 printed pages and 1 blank page.

2 Data speed of light in free space, c = 3.00 × 108 m s1 permeability of free space, o = 4 × 107 H m1 permittivity of free space, o = 8.85 × 1012 F m1 (1/(36)) × 109 F m1 elementary charge, e = 1.60 × 1019 C the Planck constant, h = 6.63 × 1034 J s unified atomic mass constant, u = 1.66 × 1027 kg rest mass of electron, me = 9.11 × 1031 kg rest mass of proton, mp = 1.67 × 1027 kg molar gas constant, R = 8.31 J K1 mol1 the Avogadro constant, NA = 6.02 × 1023 mol1 the Boltzmann constant, k = 1.38 × 1023 J K1 gravitational constant, G = 6.67 × 1011 N m2 kg2 acceleration of free fall, g = 9.81 m s2 © DHS 2021 9749/01

3 Formulae uniformly accelerated motion s = v2 = work done on/by a gas W = pV hydrostatic pressure p = gh gravitational potential  = temperature T/K = T/oC + 273.15 pressure of an ideal gas p = mean translational kinetic energy of an ideal gas molecule E = displacement of particle in s.h.m. x = x0 sin t velocity of particle in s.h.m. v = v0 cos t = electric current I = Anvq resistors in series R = R1 + R2 + . . . resistors in parallel 1/R = 1/R1 + 1/R2 + . . . electric potential V = alternating current / voltage x = x0 sin t magnetic flux density due to a long straight wire B = magnetic flux density due to a flat circular coil B = magnetic flux density due to a long solenoid B = radioactive decay x = x0 exp(t) © DHS 2021 9749/01 [Turn over

4 decay constant  = © DHS 2021 9749/01

5 1 Which estimate is realistic? A The kinetic energy of a bus travelling on an expressway is 30 000 J. B The power of a domestic light is 300 W. C The temperature of a hot oven is 300 K. D The volume of air in a car tyre is 0.03 m3. 2 A radio aerial of length L, when the current is I, emits a signal of wavelength  and power P. These qualities are related by where k is a constant. What unit, if any, should be used for the constant k? A volt B ohm C watt D no unit 3 A skydiver falls from an aircraft that is moving horizontally. The vertical component of the velocity of the skydiver is v. The vertical component of the acceleration of the skydiver is a. Which row describes v and a during the first few seconds after the skydiver leaves the aircraft? v a A B C D constant constant increasing increasing constant decreasing constant decreasing 4 A ball is thrown vertically upwards from ground level and reaches a maximum height of 12.7 m before falling back to ground level. Assume air resistance is negligible. What is the total time for which the ball is in the air? © DHS 2021 9749/01 [Turn over

6 A 1.61 s B 3.22 s C 3.88 s D 5.18 s 5 The velocity-time graph for an object of mass 2.5 kg is shown. What is the resultant force acting on the object? A 0.60 N B 0.80 N C 1.5 N D 2.0 N 6 Two gliders are travelling towards each other on a horizontal air track. Glider P has mass 0.30 kg and is moving with a constant speed of 1.2 m s –1. Glider Q has mass 0.60 kg and is moving with a constant speed of 1.8 m s–1. The gliders have a perfectly elastic collision. What are the speeds of the two gliders after the collision? speed of P / m s-1 speed of Q / m s-1 A B C 1.2 2.0 2.8 0.6 1.4 0.2 © DHS 2021 9749/01

7 D 3.6 0.6 7 A space probe is due to be launched to one of the moons of Saturn. It is believed that the conditions on the moon are such that methane exists in liquid form and that lakes of methane may exist. The probe is tested and it can be lowered to a depth of 64 m in a lake of water on Earth before the pressure is too high. The following data regarding the Earth and the moon of Saturn are available: atmospheric pressure on Earth = 100 kPa density of water in lake on Earth = 1000 kg m-3 atmospheric pressure on moon of Saturn = 35 kPa density of liquid methane on moon of Saturn = 740 kg m-3 gravitational field strength on moon of Saturn = 3.6 N kg-1 What is the maximum depth the probe may be lowered to, in a lake of methane on the moon of Saturn? A 220 m B 240 m C 260 m D 270 m © DHS 2021 9749/01 [Turn over

8 8 The diagram shows a man standing in a lift. The forces acting on the man and the forces acting on the lift are shown below. Which statement is correct? A (W1 + W2) is always equal to T. B If N = W1, the lift must be at rest. C N and W1 are always equal and opposite. D If T = (D + W2), the lift must have a constant velocity. © DHS 2021 9749/01 NN

9 9 A wooden cylinder floats in a bath of water as shown. A force F is applied to the cylinder until it is just fully submerged. Which statement is not correct? A Some of the water gains gravitational potential energy. B The cylinder loses gravitational potential energy. C Positive work is done by force F on the cylinder. D Positive work is done by the upthrust on the cylinder. 10 A pail containing 500 g of water is rotated in a vertical circle of radius 1.20 m. What is the minimum speed of the pail such that no water spills out when it is upside down at the top of the circle? A 3.43 m s-1 B 4.91 m s-1 C 11.8 m s-1 D 24.1 m s-1 11 An Earth satellite is moved from one stable circular orbit to another stable circular orbit at a greater distance from the Earth. Which one of the following quantities increases for the satellite as a result of the change? A gravitational force B gravitational potential energy C angular velocity D centripetal acceleration © DHS 2021 9749/01 [Turn over

10 12 Two stationary particles of masses and are a distance d apart. A third particle, lying on the line joining the particles, experiences no resultant gravitational force. What is the distance of this particle from ? A B C D 13 A small ice cube of mass 20 g is heated and changes from the solid to the liquid state. During the change in state, the temperature of the substance does not change. Which statement about this change in state is incorrect? A The amount of energy the ice absorbs is equal to the specific latent heat of fusion. B The average kinetic energy of the molecules remains unchanged. C The average potential energy of the molecules increases. D The total mass of ice and water remains constant throughout. 14 A gas cylinder is fitted with a safety valve which releases a gas when the pressure inside the cylinder reaches 2.0 × 106 Pa. Given that the maximum mass of ideal gas the cylinder can contain at 300 K is 2.0 kg, what is the mass of gas that escapes from the cylinder if it is heated to 400 K? A 0.50 kg B 0.75 kg C 1.2 kg D 1.5 kg 15 An ideal gas is heated very gradually. This causes it to expand slowly. During this entire process, the temperature of the gas remains constant. Which statement is correct? A As the heat is applied, the internal energy of the gas increase