TJC H1 PHYSICS P1

READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Civics group and Index Number on the Answer Sheet in the spaces provided. There are thirty questions in 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. This booklet consists of 14 printed pages. [Turn over TEMASEK JUNIOR COLLEGE 2015 Preliminary Examination Higher 1 PHYSICS Paper 1 Multiple Choice 8866/01 17 September 2015 1 hour Additional Materials: Multiple Choice Answer Sheet

2 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 = pΔV hydrostatic pressure, p = ρgh resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + …

3 1 A flat head drill bit is used to drill holes of small depth. The drill bit can drill holes with a diameter size of (40.0 ± 0.5) mm. The depth of the hole has an uncertainty of ± 1mm. If the total pe rcentage uncertainty of the volume made by the hole is less than 10%, what is the minimum depth, in mm, which the drill bit can make? A 15 B 14 C 13 D 12 2 A petrol gauge in a car indicates the volume V of fuel in the tank. V is given by the angular deflection θ of the pointer on a dial. Below are the calibration curves for the four different gauges. For high fuel levels in the tank, which gauge would be most sensitive? 3 A ball is thrown upwards at an angle to the horizontal with an initial speed. Assuming that air resistance is not negligible, which of the following statements is incorrect? A The time taken for the flight up to the highest point is longer than the time taken for the flight down. B The maximum height reached by the ball is smaller than that with negligible air resistance. C The horizontal range of the ball is shorter than that with negligible air resistance. D The path of the ball is asymmetrical about the highest point.

4 4 The variation with time t of the velocity v of a particle is shown in the figure below. Which of the following pairs of graphs best represents the variation with time of the displacement, x, and acceleration, a, for the particle? A x t t a B x t a t C x t t a D x t a t 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0

5 5 A car is travelling at a speed of 15 m s -1 and can be brought to rest with a uniform deceleration in 1.2 s if the brakes are applied. The reaction time of the driver is 0.10 s. What is the closest distance that the moving car can be to a stationary object if a collision is to be avoided? A 9.00 m B 10.5 m C 12.0 m D 19.5 m 6 Two forces, each of 10 N, act at a point P as shown in the diagram. The angle between the directions of the forces is 120°. What is the magnitude and direction of the resultant force? magnitude / N direction A 5 B 10 C 10 D 20 7 An object of mass 0.30 kg is dropped from a height of 1.2 m. On impact with the ground, the object comes to rest in 0.40 s. What is the contact force on the object? A 0.66 N B 3.6 N C 4.4 N D 6.6 N

6 8 A steel ball-bearing is released at the surface of a viscous liquid contained in a tall, wide jar. In falling through the liquid, the ball -bearing experiences a retarding force proportional to the velocity. If the depth of the liquid in the jar is H, which one of the following graphs best represents the variation of the height h of the ball-bearing above the base with time t? A B C D 9 A long and thin L -shaped tube is filled with liquid to the depth as shown in the figure below. The pressure at X due to the liquid alone is P. The tube is then rotated by an angle of 45O. What is the new pressure exerted at X due to the liquid? A ½ P B P C 2 P D 2 P 10 The figure below shows a heavy uniform rod XY of length 2.0 m and weight 400 N. It is hinged at X and held to one side by a horizontal force F acting at Y. What is the magnitude of F? A 150 N B 200 N C 250 N D 300 N

7 11 An object of mass 5.0 kg has an acceleration that varies with time as shown below. What is the change in its momentum after 20 s? A 100 N s B 200 N s C 400 N s D 500 N s 12 Three blocks X, Y and Z each of mass 1.0 kg, are suspended from a ceiling by pieces of light elastic string as shown. The arrangement is allowed to come into static equilibrium and then the string connecting X and Y is cut. At this instant, what is the upward acceleration of X? (Take g as 10 m s-2) A 0 m s-2 B 10 m s-2 C 20 m s-2 D 30 m s-2 X Y Z a / m s-2 10 20 0 t / s 10

8 13 The diagram shows a wheel of circumference 0.30 m. A rope is fastened at one end to a force meter. The rope passes over the wheel and supports a freely ha nging load of 100 N. The wheel is driven by an electric motor at a constant rate of 50 revolutions per second. When the wheel is turning at this rate, the force meter reads 20 N. What is the output power of the motor? A 0.3 kW B 1.2 kW C 1.8 kW D 3.8 kW 14 A wind turbine has blades that sweep an area of 2000 m 2. It converts the power available in the wind to electrical power with an efficiency of 50%. What is the electrical power generated if the wind speed is 10 m s –1? (The density of air is 1.3 kg m–3.) A 130 kW B 650 kW C 1300 kW D 2600 kW 15 A 200 g block is pressed against a spring of force constant 1.4 N mm -1 with a compression of 10.0 cm. The compressed spring and block are at rest at the bottom of a ramp inclined at 60 to the horizontal. A constant frictional force of 1.2 N exists between the block and the ramp. The spring is released. How far up the incline will the block move before it comes to rest? A 2.41 m B 3.21 m C 4.12 m D 7.14 m

9 16 The diagram below shows the variatio n with time of the displacement for two oscillations. What is the phase difference between the oscillations? A /4 B /2 C 3/4 D 3/2 17 A beam of plane -polarised microwaves is incident upon an aerial which is initially positioned to give maximum r esponse. In a storm, the aerial is rotated about the direction of the incident waves until it makes an angle of 30 to the plane of polarisation, as shown in the figure below. What is the percentage reduction in the intensity of the signal now received f rom the aerial? A 13 % B 25 % C 50 % D 75 % 18 Ripples on the surface of a pond spread out in circles from the point of an initial disturbance. Assume that the energy of the wave is spread over the entire circumference of