MATUNDA SECONDARY SCHOOL P.O. BOX 90 - 01015 ITHANGA- CELL 0708688090 FORM 1 END OF TERM 3 PHYSICS EXAMINATION 1. If the gravitational field strength on the moon is 1/6 that of the Earth, calculate the weight of a person whose mass is 45 kg when he is on the moon. (Take gravitational field strength on earth as 10N and per Kg) (2 Marks) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 2. A thread is carefully placed in a soap film which has been formed on a wire ring as shown in the figure below. a. Clearly show using a diagram what happens if the soap film Inside the thread is pierced by a needle. (2 Marks) b. What is the name of the force acting on the thread? (1 Mark) ……………………………………………………………………………………………………………… 3. A drop of water and a drop of Mercury were placed on a glass surface. The result was shown below. Glass Surface A a. Identify the drops A – ………………………………… b. Explain the difference in shape between A and B above B (2 Marks) B – …………………………………… (2 Marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 4. Bright specks are normally observed moving in the smoke cell experiment. What are these specks? (1 Mark) ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………….. 5. An athlete added 20 g of glucose to 40 cm3 of milk and stirred the mixture. No noticeable change in the volume of milk was observed. Why is this so? (2 Marks) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 6. Distinguish between temperature and heat (2 Marks) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 7. How is heat loss through radiation minimized in a vacuum flask? (1 Mark) ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………….. 8. The following experiment was conducted in a laboratory The flame was passed over the paper wrap several times a. What was observed at the end of the experiment? (1 Mark) ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………….. b. What does the experiment show about the conductivity of wood and that of iron? (2 Marks) ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………….. ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………….. 9. The figure below shows an electric heater placed Midway between two flask A&B. Flask A is shiny on the outside and flask B is blackened on the outside. a. Name the process through which heat travels from the heater to the flask. (1 Mark) ……………………………………………………………………………………………………….. b. State the observation that will be made (1 Mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… c. Give a reason for your observation above (2 Marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 10. State two factors that affect heat transfer in solids (2 Marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 11. Explain why at night the metal frames and supporting the glass in a window feel colder compared to the glass. (2 Marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 12. The figure below shows water being heated in a laboratory. On the diagram show the path that the water will take as it heats up. (2 Marks) 13. Convert the following temperatures into Kelvin Scale (4 Marks) a. 130 degrees Celsius ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… b. -163 degrees Celsius ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… 14. Convert the following temperatures into Celsius scale (4 Marks) a. 373 K ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… b. 250 K ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… 15. Name two types of thermometers. (2 Marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 16. Explain why burst water pipes are common during winter especially in countries near the poles (1 Mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 17. Bimetallic strip is made from Aluminum and Copper. When heated, it bends in the direction shown below. a. Which metal expands more for the same temperature rise? (1 Mark) ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… b. Draw a diagram to show how the bimetallic would appear if cooled below room temperature. (2 Marks) 18. The figure below shows a liquid glass thermometer a. Why is the thermometer only calibrated from 35 degrees Celsius to 43 degrees Celsius? (1 Mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… b. What advantage does the thermometer have in terms of the temperature range over another liquid-inglass thermometer calibrated from 0 degrees Celsius to 100 degrees Celsius? (1 Mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… c. Name the section labelled X (1 Mark) ………………………………………………………………………………………………………… d. What is the function of the part marked W? (1 Mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… e. Explain how the part labelled X makes the thermometer appropriate for its function (2 Mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… f. How would you sterilize the thermometer? (1 Mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 19. The illustration below shows the layers of water in a sea in a cold region. a. Explain how the fish survive under the water yet the top is frozen (3 Marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 20. The diagram illustrates two types of reflection A a. Name the types of reflection A…………………………….……… B (2 Marks) B………………………………… b. What kind of surface form the reflection demonstrated by B? (1 Mark) ………………………………………………………………………………………………………… 21. Name the beams of light shown below (3 Marks) ………………………………………………….. …………………………………………………... …………………………………………………… 22. A building 4 meters high is located 10 meters from the opening of a pinhole camera. If the screen of a camera is 10 cm from the pinhole, calculate the height of the image formed. (3 Marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… …………………………………………………………………………………………………………
