NJC H1 PHY P1 Question

1 NJC 2016 8866/01/16 [Turn over PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 8866/01 31 August 2016 1 hour READ THE INSTRUCTION FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Centre number and index number on the Answer Sheet in the spaces provided unless this has been done for you. 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. This document consists of 14 printed pages. OAS index number is in 5-digit format. 5 digit format: 2nd digit and the last four digits of the Reg Number. e.g. 0905648 = 95648. 1

2 NJC 2016 8866/01/16 [Turn over Data speed of light in free space, c = 3.00 x 108 m s-1 elementary charge, e = 1.60 x 10-19 C the Planck constant, h = 6.63 x 10-34 J s unified atomic mass constant, u = 1.66 x 10-27 kg rest mass of electron, me = 9.11 x 10-31 kg rest mass of proton, mp = 1.67 x 10-27 kg acceleration of free fall, g = 9.81 m s-2 Formulae uniformly accelerated motion, s = ut + ½at2 v2 = u2+ 2as work done on/by a gas, W = pV hydrostatic pressure, p = gh resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + …

3 NJC 2016 8866/01/16 [Turn over A 2 B 3 C 4 D 8 1. The volume of liquid flowing per second is called the volume flowrate Q and has the unit m3 s-1. The flowrate through a hypodermic needle during an injection can be estimated with the following equation: 𝑄 = 𝜋𝑅𝑛(𝑃2 − 𝑃1) 8𝜂𝐿 The length and radius of the needle are L and R, respectively. The pressure at opposite ends of the needle are P2 and P1. The viscosity of the liquid is given by  which has the unit kg m-1 s-1 . The value of n is 2. In an experiment to find the constant acceleration of a toy car, the speed of the toy car was captured using speed meters placed at 2 different locations, A and B respectively. The distance between A and B is measured as S. Distance S = 1.400 m ± 0.002 m The manufacturer for the speed meter quoted an uncertainty of 1 % for their instrument. Speed measured at A = 2.50 m s-1 Speed measured at B = 4.65 m s-1 The correct acceleration of the toy car is A (5.49 ± 0.04) m s-2 B (5.50 ± 0.04) m s-2 C (5.5 ± 0.4) m s-2 D (5.5 ± 0.2) m s-2

4 NJC 2016 8866/01/16 [Turn over 3. The figure below shows the speed v versus vertical height y of a ball tossed directly upward. The speed at height yA is vA. The speed at height yB is 1/3 vA. What is the speed vA? A 2.10 m s-1 B 2.97 m s-1 C 6.98 m s-1 D 9.40 m s-1 4. Two similar balls A and B were fired at different angles but with the same vertical velocity from the edge of a cliff. Which of the following statements is false? A Both balls will hit the ground at the same time. B The change in momentum of both balls are the same. C The ratio of the horizontal velocity of ball A to the horizontal velocity of ball B is a constant value of 1/√3. D The kinetic energy of ball A, just before impact with the ground , is greater than ball B. Ground Cliff Ball A Ball B 30o 60o 0.40 m

5 NJC 2016 8866/01/16 [Turn over 5. An object is projected with a certain velocity at an angle from a flat surface. Which of the following graphs correctly shows the variation of the horizontal displacement with time, and the variation of the kinetic energy with vertical displacement of the object? Horizontal displacement vs time Kinetic energy vs vertical displacement A Graph 1 Graph 2 B Graph 1 Graph 4 C Graph 3 Graph 2 D Graph 3 Graph 4 6. Consider two laboratory carts of different masses but both possess identical kinetic energy. Which of the following statements must be correct? (1) The one with the greatest mass has the greatest momentum (2) The same impulse was required to accelerate each cart from rest (3) Both can do the same amount of work as they come to a stop (4) The same amount of force was required to accelerate each cart from rest A (1), (4) B (2), (3) C (3), (4) D (1), (3) y x Graph 1 y x Graph 3 y x Graph 4 y x Graph 2 0 0 0 0

6 NJC 2016 8866/01/16 [Turn over 7. Three blocks of masses 3m, 2m and m are connected to strings A, B and C as shown below. The blocks are placed on a smooth slope surface and attached to a block of mass 6m by string C. Assuming that the pulley is smooth, which string must be the strongest in order not to break when the block of mass 6m is released? A A B B C C D They must all be the same strength. 8. A door is fitted with a spring-operated latch as shown. When the latch is pushed in, the spring becomes compressed but remains within its elastic limit. The latch is suddenly released. Which graph best shows how the acceleration a of the latch varies with distance x it moves before it stopped? Ignore friction. A B C D C B A 6m m 2m 3m

7 NJC 2016 8866/01/16 [Turn over A R B S C T D U 9. A child drinks a liquid of density ρ through a vertical straw. Atmospheric pressure is po and the child is capable of lowering the pressure at the top of the straw by 10 %. What is the maximum length of straw above the liquid that would enable the child to drink the liquid? A g op 10 B g op  C g op 10 9 D g op  10 10. The figure below shows a ladder PQ with a centre of mass R, resting a rough wall QS. The resultant forces at P and Q are FP and FQ respectively. If the ladder is in equilibrium, FP and FQ must act through point 11. Two identical balls were released simultaneously from rest at X and made their way to Y along two different tracks on the same vertical plane as shown below . Ball 1 travels along a straight down-slope track while ball 2 travels along a curve down-slope followed by an up-slope track. Ball 2 reaches Y first. Neglecting all resistive forces, what can be said of the final energy and the average rate of energy conversion for the two balls? Final total energy of Higher average rate of energy conversion A Both balls are the same Ball 2 B Ball 2 is higher Ball 1 C Ball 2 is higher Ball 2 D Both balls are the same Ball 1 X Y 1 2

8 NJC 2016 8866/01/16 [Turn over S1 S2 Z Y X W 12. An object resting on a horizontal frictionless surface is accelerated from rest by a constant force from a motor. Which of the following graphs shows the variation of the motor power P with time t ? A B C D 13. S1 and S2 are two identical sources of waves that are in phase. The instantaneous positions of two wave crests from each source are shown below. Which of the following is true? A X is a point where the 2 crests have a phase difference of 2n where n is an integer. B W is a point of destructive interference. C S1Y – S2Y = n  where n is an integer. D S1Z – S2Z = (2n - 1) /2 where n is an integer.

9 NJC 2016 8866/01/16 [Turn over 14. The diagram below shows the positions of the air particles for an open-closed tube at the instant when time t = 0 s. Which of the following statements is NOT correct? A At the instant t = 0 s, the air pressure variation is maximum but the air velocity is zero