DHS 2021 JC1 MYE Physics

1 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Mid Year Examination Year 5 H2 PHYSICS Multiple Choice and Structured Questions Additional Materials: Multiple Choice Answer Sheet 9749 1 July 2021 2 hours READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A There are fifteen questions in this section. 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. You are advised not to spend more than 30 minutes on Section A. Section B Answer all questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. You are advised not to spend more than 1 hour 30 minutes on Section B. For Examiner’s Use Section A MCQ 15 Section B 1 10 2 10 3 10 4 10 5 10 6 10 s.f. -1 Total 75 This document consists of 22 printed pages and 2 blank pages.

2 [Turn over Data speed of light in free space, c = 3.00 × 108 m s−1 permeability of free space, µo = 4π × 10−7 H m−1 permittivity of free space, εo = 8.85 × 10−12 F m−1 = (1/(36π)) × 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, m e = 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

3 [Turn over Formulae uniformly accelerated motion, s = ut + 1 2 at2 v2 = u 2 + 2as work done on/by a gas, W = p∆V hydrostatic pressure, p = ρgh gravitational potential, φ = −Gm/r temperature, T/K = T/oC + 273.15 pressure of an ideal gas, p = 21 3 Nm cV <> mean translational kinetic energy of an ideal gas molecule, E = kT2 3 displacement of particle in s.h.m., x = x0 sin ωt velocity of particle in s.h.m., v = v0 cos ωt = ±ω 2 2x xo − electric current, I = Anvq resistors in series, R = R1 + R2 + . . . resistors in parallel, 1/R = 1/R 1 + 1/R2 + . . . electric potential, V = r Q oπε4 alternating current / voltage, x = x0 sin ωt magnetic flux density due to a long straight wire, B = 0 2 d Iµ π magnetic flux denxity due to a flat circular coil, B = 0 2 N r Iµ magnetic flux density due to a long solenoid, B = 0nIµ radioactive decay, x = x0 exp(−λt) decay constant, λ = 1 2 ln2 t

4 Section A Answer all the questions. 1 Which of the following gives the best estimate of the typical cruising speed of a 300-seater commercial passenger aircraft? A 500 km h−1 B 1000 km h−1 C 2000 km h−1 D 2500 km h−1 2 The diagram shows an experiment to measure the speed of a small ball falling at constant speed through a clear liquid in a glass tube. There are two marks on the tube. The top mark is positioned at (115 ± 1) mm on the adjacent rule and the lower mark at (385 ± 1) mm. The ball passes the top mark at (1.50 ± 0.02) s and passes the lower mark at (3.50 ± 0.02) s. The constant speed of the ball is calculated to be 385 115 270 1353.50 1.50 2.00 − = =− mm s−1. Which expression calculates the fractional uncertainty in the value of this speed? A 0.02 1 2.00 270+ B 0.04 2 2.00 270+ C 2 0.04 270 2.00÷ D 1 0.02 270 2.00÷

5 [Turn over 3 The diagram shows the variation with time of the displacement of two cars M and N. Which statement is incorrect? A Car M overtakes car N at time t. B Throughout the motion, both cars are accelerating. C At time t, the average velocities of both cars are equal. D At time t, the rate of change of displacement of car N is less than that of car M. 4 The diagram shows a laboratory experiment in which a feather falls from rest in a long evacuated vertical tube of length L. The feather takes time T to fall from the top to the bottom of the tube. How long will the feather take to fall 0.50 L from the top of the tube? A 0.25T B 0.29T C 0.71T D 0.75T

6 [Turn over 5 A ball falls vertically and bounces on the ground. The following statements are about the forces acting while the ball is in contact with the ground. Which statement is correct? A The force that the ball exerts on the ground is always equal to the weight of the ball. B The force that the ball exerts on the ground is always equal in magnitude and opposite in direction to the force the ground exerts on the ball. C The force that the ball exerts on the ground is always less than the weight of the ball. D The weight of the ball is always equal in magnitude and opposite in direction to the force that the ground exerts on the ball. 6 Two masses, M and m, are connected by an inextensible string which passes over a frictionless pulley. Mass M rests on a frictionless slope, as shown. The slope is at an angle θ to the horizontal. The two masses are initially held stationary and then released. Mass M moves down the slope. Which expression must be correct? A sin θ < m M B cos θ < m M C sin θ > m M D cos θ > m M

7 [Turn over 7 The graph shows the effect of applying a force of up to 5.0 N to a spring. The spring obeys Hooke’s law for forces up to 7.0 N. What is the total extension of the spring produced by a 7.0 N force? A 4.2 cm B 5.6 cm C 15 cm D 20 cm 8 Four cuboids with identical lengths, breadths and heights are immersed in water. The cuboids are held at the same depth and in identical orientations by vertical rods, as shown. Water has density ρ. Cuboid W is made of material of density 4ρ. Cuboid X is made of material of density 2ρ. Cuboid Y is made of material of density ρ. Cuboid Z is made of material of density 0.5ρ. Which statement is correct? A The upthrust of the water on each of the cuboids is the same. B The upthrust of the water on W is twice the upthrust of the water on X. C The upthrust of the water on X is twice the upthrust of the water on W. D The upthrust of the water on Y is zero.

8 [Turn over 9 An electric motor is required to haul a cage of mass 400 kg up a mine shaft through a vertical height of 1200 m in 2.0 minutes. The motor used is 80% efficient. What is the power supplied to the motor? A 31 kW B 49 kW C 73 kW D 79 kW 10 A toy car of mass 7.0 kg is moving at a constant velocity of 20 m s−1 up a track that is inclined at an angle of 30o to the horizontal. A constant resistive force of 12 N acts on the toy car throughout its motion. What is the power supplied by the motor of the toy car? A 240 W B 450 W C 930 W D 1600 W 11 A ball of mass 0.30 kg is attached to a string and moves in a vertical circle of radius 0.60 m at a constant speed of 5.0 m s−1. Which row in the table gives the correct values of the minimum and maximum tension in the string? minimum tension / N maximum tension / N A B C D 2.5 6.7 13