HALF YEARLY EXAMINATIONS 2017/2018. Answer ALL questions showing your working Where necessary give your answers correct to 2 decimal places.

Transcription

1 Track 2 SECONDAR Y SCHOOL MRIEHEL HALF YEARLY EXAMINATIONS 2017/2018 FORM: 4 PHYSICS Time: 1½ hrs Name: Class: Answer ALL questions showing your working Where necessary give your answers correct to 2 decimal places. Table of Formulae Acceleration due to gravity g = 10 m/s² Average speed = total distance v = u + at a = (v u) total time t s = ut + ½at 2 s = (u + v)t v 2 = u 2 + 2as 2 Refractive index n = real depth Refractive index n = speed of light in air apparent depth speed of light in medium Magnification = height of image = image distance from lens height of object object distance from lens Speed of wave v = fλ Periodic time T = 1 f Area of a triangle = ½bh Area of a trapezium = h(a + b) 2 For examiners use only Question Theory Practical Total Max. Mark Score Physics Form 4 Page 1 of 8 Half-Yearly T2/

2 SECTION A This section carries 40 marks 1. This question is about light waves (a) The diagram shows two rays from the object falling onto a plane mirror. (i) Label the missing information. [1] (ii) Complete the above diagram showing the normal, the reflected ray and the reflected ray produced backwards. [3] (iii) Is the image real or virtual? [1] (b) The object is then placed in a swimming pool as shown. (i) The object underwater will appear to be at a different depth when seen from above. This is caused by [1] (ii) Draw the image seen by the eye. [2] object air water plane mirror object image 2. This question is about distance-time graphs The following table shows the distance travelled by a motorcycle from home to a nearby stationery. Time (s) Distance (m) (a) On the graph paper provided, plot a distance-time graph showing the motion of the bicycle. [5] (b) From your graph find the distance moved by the bicycle in the first 1.5 seconds. [2] (c) On your graph mark the region AB in which the bicycle is moving at the greatest velocity. [1] Physics Form 4 Page 2 of 8 Half-Yearly T2/

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4 3. This question is about electromagnetic waves Gamma rays Ultraviolet Visible Light Microwaves Radiowaves (a) Complete the above list of electromagnetic waves. [2] (b) The speed of the electromagnetic waves is (330 m/s, m/s, 3000 m/s). [1] (c) have the shortest wavelength. [1] (d) Electromagnetic waves are waves and therefore every part of these waves vibrate to the direction of motion of the wave. [2] (e) Which electromagnetic wave is used: (i) to check bank notes, [1] (ii) for sending signals to satellites. [1] 4. This question is about sound waves a) The Bell Jar experiment is used to prove that sound cannot travel in a. [1] b) Label the diagram with the correct names for the apparatus used. [4] Cork Vacuum Pump Bell Jar Electric Bell c) Briefly describe how the apparatus is used to conduct the Bell Jar Experiment. [3] Physics Form 4 Page 4 of 8 Half-Yearly T2/

5 5. This question is about waves a) Diffraction occurs when the of the gap is comparable to the of the wave. [2] b) Complete the following diagrams for refraction and diffraction. [2,2] c) Underline the correct answer. When diffraction occurs the wavelength of the wave (decreases, stays the same, increases) while the speed of the wave (decreases, stays the same, increases). [2] SECTION B This section carries 45 marks 6. This question is about Motion a) The figure shows a velocity-time graph for a lift moving upwards from the first to the tenth floor in a high building. velocity (m/s) A B 1 0 O C time (s) Physics Form 4 Page 5 of 8 Half-Yearly T2/

6 i. Underline the correct word: [3] During region OA, the lift is (at rest, accelerating, moving at constant speed). From point A to point B, the lift is (decelerating, accelerating, moving at constant speed) while during region BC the lift is (decelerating, accelerating, moving at constant speed). ii. The maximum speed reached by the lift is m/s. [1] iii. The gradient of a velocity-time graph represents the. [1] iv. Using the graph, find the acceleration of the lift. [2] v. Calculate the distance moved between points O and A. [2] b) During a race, an athlete accelerates uniformly from rest to reach a speed of 9 m/s in 10 s. i. The runner s initial speed u = m/s. [1] ii. The runner s final speed v = m/s. [1] iii. Find the acceleration of the athlete. [2] iv. Determine the distance travelled by the athlete in 10 s. [2] 7. This question is about lenses (a) The following is a convex lens with a beam of parallel rays falling on it. F (i) The ray at the centre does not bend when it passes through the lens. Complete the diagram to show how the three rays meet at F. [2] (ii) F is the (focus, focal length, centre) of the lens. [1] (iii) The focal length of the lens is the distance from the to the centre of the lens. [1] Physics Form 4 Page 6 of 8 Half-Yearly T2/

7 (b) Chloe placed an object 1 cm high 1 cm in front of the lens. The lens has a focal length of 2 cm. Note: 1 square represents 1 cm. O F F (i) Complete the ray diagram to show the position of the image produced. [5] (ii) Write down the three characteristics of the image formed by choosing the correct word from the following: magnified or diminished [1] upright or inverted [1] real or virtual [1] (iii) The height of the object O is 1.0 cm. Use a ruler to measure the height of the image produced. [1] (iv) Use the information in (iii) to calculate the magnification of the lens. [2] 8. This question is about waves a) On the transverse wave shown, mark the wavelength and the amplitude a of the wave. [2] b) Fill in using the following words: 20 compression longitudinal light rarefaction ultrasound i. An example of a transverse wave is. [1] ii. Sound is a wave. A sound wave consists of high Physics Form 4 Page 7 of 8 Half-Yearly T2/

8 pressure regions called, and regions of low pressure called. [3] iii. The human ear is able to hear frequencies from Hz to Hz. Sounds with frequencies above this range are called. [3] c) Fishermen use sonar in order to determine the depth beneath their fishing boat. If the speed of sound in water is 1500 m/s, and the time taken by the sound wave to return to the boat is 0.4 s, calculate the distance travelled by the sound wave. [2] d) Given that the sound wave travelled from the boat, to the seabed and then back to the boat, what is the depth of the sea? [1] e) Use the equation v = fλ to find the wavelength of the wave, given that the frequency of the emitted wave is 30 khz. [3] END OF PAPER PLEASE CHECK YOUR WORK! Physics Form 4 Page 8 of 8 Half-Yearly T2/