ST.FRANCIS SECONDARY SCHOOL Specimen Annual Paper FORM 3 PHYSICS TIME: 2 hrs Name: Class: Answer all questions both in Section A and Section B. In calculations show all steps in your working. The use of scientific calculators is allowed. Wherever necessary take g = N/kg Optics = of light inair speedof light inmedium speed = real depth apparent depth Forces & Motion W = mg Total Distance Average speed = Total Time Density m = ρ V Waves v = f λ m = u v m = f = 1 T height of image height of object St. Francis Secondary School, Sliema Page 1 of 12
Section A Answer all questions. Each question carries marks. 1. This question is about density. Elisa and Paul had 3 liquids A, B, and C and they placed them into the measuring cylinder as shown in Diagram 1. (a) Measure the volume of each of the 3 liquids: Diagram 1 i) Liquid C: ii) Liquid B: iii) Liquid A: (3) (b) An equal amount of liquid A as above is put into a beaker. Give an appropriate method to find the mass of this liquid. (3) (c)the mass of liquid B is 60 g. Calculate the density of liquid B. (2) _ (d) Liquid A is (less dense/ denser) than liquid B, and liquid C is (less dense/ denser) than liquid B. (2) St. Francis Secondary School, Sliema Page 2 of 12
2. This question is about reflection. (a) Diagram 2 shows reflection in a plane mirror. Fill in the missing boxes. (5) Diagram 2 (b) State the two laws of reflection: (2) i. ii. (c) Draw the position of the image in a plane mirror in Diagram 3. Complete the two rays to show how an observer sees the image in the plane mirror. (3) Diagram 3 St. Francis Secondary School, Sliema Page 3 of 12
3. This question is about waves. Diagram 4 shows a displacement-time graph of a wave. Diagram 4 (a) Using information from the above graph, what is the: i. Periodic time: (1) ii. Amplitude in m: (1) (b) Calculate the frequency of the above wave. (2) (c) Calculate the velocity of the wave given that the wavelength is 50 cm. (2) (d) Waves can be classified as transverse or longitudinal. a. Give two differences between a transverse and a longitudinal wave. (2) (i) (ii) b. Give an example of a transverse wave: (1) c. Give an example of a longitudinal wave: (1) St. Francis Secondary School, Sliema Page 4 of 12
4. This question is about lenses. Adam is using a convex lens in the lab. a) Draw the typical setup he uses in the experiment to find the focal length of a convex lens roughly. Label clearly all apparatus. (3) b) i) Complete the following ray diagram: (3) ii) From your diagram it is evident that the image is (real/ virtual) and (magnified/ diminished). (2) iii) Name two typical use of this arrangement of the lens. (2) St. Francis Secondary School, Sliema Page 5 of 12
5. This question is about the Earth and the Universe a) Define a planet. (3) b) Jupiter is seen in the night sky shining brightly due to its massive size. Give the difference between a planet like Jupiter and a Sun like ours. (2) c) i) The mass of a rocket on Earth is 5000 kg. What is its weight on Jupiter if it has a gravitational field strength of 27 N/kg? (2) ii) The mass of the rocket on the Moon would be (smaller/ the same/ bigger). (1) d) Watching the film Gravity, astronauts are seen to be weightless. What does this term refer to? (2) St. Francis Secondary School, Sliema Page 6 of 12
6. This question is about water waves a) Some students are in the lab studying water waves. The instrument that they use is called a tank. To slow down the motion of the waves and view the effects being studied clearly they use a (2) b) Refraction effects were set up in the above apparatus. Complete diagrams 6 and 7 to show how water passes in shallow section of the ripple tank. (3,3) i) Diagram 6 Diagram 7 c) One of the students uses barriers to show diffraction at the Breakwater in Valletta. Encircle the correct diagram shown in Diagram 8. (2) Diagram 8 St. Francis Secondary School, Sliema Page 7 of 12
7. This question is about the electromagnet spectrum a) Complete the spectrum of waves: Radio, Infrared, Visible,, X-rays, (2) b) Give two features common to all waves in the electromagnetic spectrum. (2) c) Fill in the table below (4) Description - used to sterilise medical equipment - typically helpful to find humans after an earthquake - used in scanners to check banknotes - helps plants grow by photosynthesis Type of wave used d) A local radio station transmits its programmes with a frequency 5 khz. This is received by the Hi-fi antenna. What is the wavelength of this wave? (2) St. Francis Secondary School, Sliema Page 8 of 12
Section B Each question carries 15 marks. Answer all questions. 8.This question is about sound a) Evelyn is in a large field with her brother Mark. They decide to do an experiment to find the speed of sound. In three steps, outline a simple way of how they can do this. (3) b) The teenagers have their dog with them which they are training using a dog whistle. Mark complains that the whistle does not work as no sound is heard on blowing it. i) What is the range of audible frequencies for humans? (2) ii) What type of sound is emitted by the whistle? (2) iii) As the teenagers move near a high wall, they note that the dog s barking echoes after 5s. If the speed of sound is 330 m/s, how far away is the wall? (2) St. Francis Secondary School, Sliema Page 9 of 12
c) In the lab, Evelyn speaks into a microphone connected to a Cathode Ray Oscilloscope. Diagram 9 i) What is the periodic time T for the shown wave? (1) ii) Mark one wavelength as λ on Diagram 9. (1) Use Diagram 9 to show what effect is seen to the wave on the screen if: iii) Evelyn speaks louder into the microphone. Draw and label this wave as X. (2) iv) the sound wave is lowered to half the shown frequency. Draw this as a dotted wave and label it as Y. (2) St. Francis Secondary School, Sliema Page of 12
9. This question is about optics. Jacques and Sarah carried out an experiment to find the critical angle of a semi-circular transparent glass block. They obtained the following results: angle of incidence in plastic/ Angle of refraction in air/ 0 20 30 40 45 50 0 13 27 41 57 68 90 (a) Plot a graph of angle of refraction in air on the y-axis against angle of incidence in plastic on the x-axis. Draw the best curve. (5) (b) From your graph, find the angle in air when the angle in plastic is 35. (1) (c) From your graph, find the angle in plastic when the angle in air is 25. (1) (d) What is the critical angle of this type of plastic? (2) (e) Complete diagram below to show the path followed by the ray of light XY incident as shown. (2) Diagram (f) What do we call the phenomenon in (e)? (1) St. Francis Secondary School, Sliema Page 11 of 12
(g) Why does the ray XY not bend as it enters the semi-circular part of the plastic block? (1) _ (h) Give two applications of the phenomenon you mentioned in (f). (2) End of Exam Paper Go back and check your work! Student s Name: Class Question 1 2 3 4 5 6 7 8 9 Total Mark 15 15 % Topic Density Optics Reflection Waves Optics- Lenses Earth and Universe Water waves Electromagnetic Spectrum sound Optics refraction Score St. Francis Secondary School, Sliema Page 12 of 12