PHYSICS Answer ALL questions. Question 1 a) Assume that the layer that a layer of oil about 0.5 cm thick is oating on a body of water. A light ray originating from the body of water strikes on the boundary surface between the water and the oil at an incident angle of 25. The medium above the oil layer is air. The refractive indices of the oil, water and air are 1.63, 1.33 and 1.00 respectively. i. Calculate the angle of refraction in the oil. (4 marks) ii. What is the critical incident angle of the oil-air boundary? (3 marks) iii. Will the light ray in the oil layer be totally reected? (1 mark) b) A convex lens has a focal length of 12.5 cm. An object is placed 8.0 cm from the lens. i. Find the image distance. (2 marks) ii. If you want to get an image which is 4 times the size of the object and inverted, where should you place the object? (4 marks) c) Table 1 shows the readings recorded by the rate meter for four containers P, Q, R and 3 when a radioactive source is placed near the containers. The rate meter records a reading of 100 counts per minute when there is no radioactive source nearby. Table 1 I Container P Brim Q R S Rate mmr reading {counts per minute) \"an\" Human nwm' km: (Manna: Wait" i. Name the radiation emitted by the radioactive source (1 mark) ii. Based on Table 1, which container has the least amount of milk? State one reason for your answer. (2 marks) Question 2 a) A boy is holding a 1.5kg ball falling from a height of 30m. As the ball falls, the increase in kinetic energy means a decrease in potential energy but the total energy {mechanical energy) remains the same. Complete Table 3 below. (Hint: use the principles of conservation of energy , use gravity, 9 = 9.81mi?) (7 marks) Table 3 Potential Energy, Kinetic Energy, KE PE (J) (J) Height (m) 30 25 Figure 1 i. Name the instrument Q (1 mark) ii. State the function of R in the circuit? (1 mark) c) Figure 4 shows a lighting circuit of a lighthouse. Figure 2 i. State the type connection of the bulb in Figure 2. (1 mark) ii. Describe in brief the condition of the other bulbs when one bulb blows. (1 mark) iii. All the bulbs in Figure 4 are labelled 240V, 60W. Explain in brief what is meant by 240 V, 60W? (2 marks) iv. Calculate the current in the circuit when only one bulb is lit. (3 marks) v. Calculate the total resistance of the circuit when all bulbs are lit. (4 marks) V: IR Answer ALL questions from this section. 1.What is meant by the scalar quantities? A. A quantity with magnitude only B. A quantity that has both magnitude and direction. C. A quantity with a displacement D. A vector which consists of head and tail. 2. Mass is a A. Scalar quantity B. Derived quantity C. Vector quantity D. Force quantity 3. Density is a A. Scalar quantity B. Derived quantity C. Kinematic quantity DI. Force quantity 4. Unit of force is A. Ampere B. Volts C. Newton D. Pascal 5. Which of the following is an accurate statement? A. The magnitude of a vector can be positive or negative. B. A vector cannot have zero magnitude if one of its components is not zero. C. The magnitude of a vector can be less than the magnitude of one of its components. D. If the magnitude of vector A is less than the magnitude of vector B, then the x- component of A is less than the x- component of B 6. Which of the following is NOT a derived quantity? A. Density B. Acceleration C. Velocity D. Time I". The slope of a position vs time graph gives A. position B. velocity 0. acceleration D. displacement B. The slope of a velocity versus time graph gives A. position B. velocity C. acceleration D. displacement 9. Can work be done on a system if there is no motion? A. Yes, if an outside force is provided. B. Yes, since motion is only relative. C. No, because of the way work is dened. D. No, since a system which is not moving has no energy. 'EO. Which one is the symbol for micro? A. M B.K C.n] D.p 11. In the equation F = ma, what does m represent? A. Mass B. Meters C. Force D. Acceleration 12. A 1.0 kg ball falls to the floor. The height of the balls is 0.70m above the floor. Calculate the potential energy of the ball. A. 6.86 J B. 68.6 J C. 78.8 J D. 76.8 J 13. Express 80 km/h in meter per second A. 2.22 m/s B. 222.22 m/s C. 22.22 m/s D. 2222 m/s 14. If you stands 2.0 m in front of a plane mirror, how far way would you see the image of yourself? A. 1.0 m B. 2.0 m C. 4.0 m D. 6.0 m 15. Which one of the following best describes the image of a plane mirror? A. Real, inverted, diminished. B. Virtual, erect and magnified. C. Virtual, erect and not diminished. D. Virtual, erect and not unmagnified. 16. Light travelling at angle into a denser medium is refracted A. equally B. toward the normal C. away from the normal D. parallel to the normal 17. The critical angle for a beam of light passing from water into air is 48.8. This mean that all light rays with an angle of incidence greater than this angle will be A. absorbed B. totally reflectedC. totally diminished D. partially reected and partially transmitted 18. What is the standard metric unit of power? A. Pascal B. Newton C. Joule D. Watt 19. The distance between successive crests on a wave is called the wave's A speed B. frequency 0. amplitude D. wavelength 20. In a wave, the maximum displacement of points of the wave from equilibrium is called the wave's A. speed B. frequency 0. amplitude D. wavelength 21. In a tug of war, when one team is pulling with a force of 100 N and the other 80 N, what is the net force? A.20N B. BUN C. 100 N D. 180 N 22. Calculate the velocity of a wave that has a wavelength of 4.0 m and a frequency of 50 Hz? A0005 mils 3.0.08 ms 0. 12.5 ms D200 ml's 23. Water waves are A. longitudinal waves B. transverse waves C. travel through the vacuum D. travel faster in gas medium compared to solid medium 24. What is dened by potential energy? A. The energy that an object possesses when in motion. B. The sum of kinetic energy and the potential energy. C. The sum of kinetic energy D. The energy that an object possesses due to its position. 25. Which of the following is most closely identified with loudness of a musical note? A. Phase. B. Velocity C. Frequency. D. Amplitude. 26. What is the standard metric unit of work? A. Watt B. Joule C. Pascal D. Newton 27. A ping-pong ball moving east at a speed of 4 m/s, collides with a stationary bowling ball. The ping-pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision? A. The bowling ball. B. The ping-pong ball. C. Neither; both experienced the same magnitude impulse. D. It's impossible to tell since the velocities after the collision are unknown. 28. A car accelerates from 12 m/s to 25 m/s in 6.0s. What is the acceleration? How far did it travel? Assume constant acceleration. A. 2.2 m/s2 , 1.1 x 102 m B. 2.9 m/s2 , 1.1 x 102 m C. 2.3 m/s2 , 1.7 x 102 m D. 2.5 m/s2 , 1.9 x 102 m 29. Syafinaz set a world record for the 100m run with a time of 9.86s. If after reaching the finish line, Syafinaz walked directly back to his starting point in 90.9s, what is the magnitude of her average velocity for the 200m? A. zero B. 1.10 m/s C. 1.98 m/s D. 5.60 m/s 30. A n object, of mass M is suspended by a string from the ceiling inside an elevator. The elevator is travelling upward with a constant speed. The tension in the string is A. equal to Mg B. less than Mg C. greater than Mg D. impossible to tell without knowing the speed 31. The frequency range of human perception is between A. 2 Hz to 200 Hz B. 20Hz to 20 000 Hz C. 20kHz to 20 MHz D. 20 Hz to 20MHz32. What is transported by a wave? A. Energy B. Light C. Sound D. Water 33. Which of the following is NOT a transverse wave? A. Waves on stretched spring B. Waves passing through a solid C. Electromagnetic waves D. Water waves 34. Which of the following statements about a mechanical wave is correct? A. Material of the medium moves in the direction of wave propagation B. All mechanical waves travel at same speed C. Mechanical waves are produced by vibrating bodies D. Mechanical waves travel with a speed of 3 x 108 m/s. 35. In a the motion of particles in the medium is perpendicular to the direction of propagation of the wave. A. Transverse Wave B. Straight Wave C. Longitudinal Wave D. Circular Wave 36. In a , the motion of particles in the medium is along the same line as the direction of propagation of the wave. A. Transverse Wave B. Straight Wave . Longitudinal Wave D. Circular Wave 37. The difference between transverse wave and longitudinal waves is that: A. Transverse waves can travel in vacuum but not longitudinal waves. B. In transverse waves, the vibration of particles is perpendicular to the direction of wave motion, but in longitudinal waves it is parallel. C. Energy is transferred by transverse waves but not by longitudinal waves. D. Transverse waves travel faster than longitudinal waves 38. A sound wave is a wave. A. Transverse B. Longitudinal C. Crests D. Throughs 39. Given that the atmospheric pressure at Cameron Highlands is 72 cm Hg. Find the equivalent value of this pressure in the unit Pascal (Pa). (Density of mercury: 13600 kg/m3) A. 97920 Pa B. 97800 Pa C. 97720 Pa D. 97623 Pa 40. A metal of mass 2kg. Calculate the amount of heat that must be transferred to the metal to raise the temperature from 30 C to 70 C. (Specific capacity of the metal = 500 J/kg C) A. 40,000 J B. 50,000 J C. 60,000 J D. 70,000 J