QUESTION 1 & ANSWER Title: Experiment on Pendulum Box Apparatus: -Check d Exam Forum ======== 1.Why is spherical bob preferred to bob of other shapes for use in the experiment ? because ball is a bowl 2.State two examples of simple harmonic motion other than the sinple harmonic motion i. liquid in U-tube set in motion ii. motion of projectile of a body performing circular motion iii. loaded test tube floating vertically in liquid set in vertical motion 3.state two precautions i. I maintain small oscillations ii. I read the metre rule from the same horizontal as to avoid parallax errors iii. I ensure that the table was not shaken iv. I ensure steady oscillations before timing v. I made the support firm vi. I avoided conical oscillations QUESTION 2 & ANSWER Title: Experiment on Optical Lenz Apparatus: Meter rule, Screen, Lenz holder, A ray Box, Converging of focal Length 15cm, Ray Box. Diagram lens diagram 2014 PHYSICS PRACTICAL ANSWER from solutionguys.net Click here to subscribe for 2014 waec answers Table of Value Click here for table of value Plot the Graph of D^2 - L^2 on the vertical axix agains D on the Horizontal axis. What is ray box The ray box is used to obtain a guided beam or ray of light. The gauze or cross at the opening serves as an object LENSE The shape of the lenses determine it name LENSE HOLDER Is used to keep lenses is a desired upright position PRECAUTIONS 1. I ensure that sharp image are formed 2. I ensure that the lens and screen are not inclined while V (0bject Meter) is being determined. solutionguys.net 3. I avoid parallax error while taking meter rule reading. 4. I ensure that I took repeated reading in my timing in order to avoid random error. 5. I ensure that there was no air inference determining the position of the center of gravity of the meter rule. Click here to subscribe for 2014 waec answers Different between Real Image and Virtual Image _Real Image can be formed or recovered on the screen while Virtual image can not be formed or recovered on the screen. _Real image is formed by the intersection of actual…….loading……99% QUESTION 3 & ANSWER Graph i. find the slop ii. find the intercept ,K, on the vertical axis evaluate r=k/s. state the precautions you took to ensure accurate result PRECAUTIONS 1. I ensured tight connection 2. I ensured that the jockey was not drawn on meter bridge wire 3. I make sure that the key was open after taking the reading 4.I avoid zero error of the instrument 5.zero error were corrected in the meter 6. the jockey was not dragged on the potentiometer wire 7. errors due to parallax was avoided by looking directly on the meter pointer What is ohms law ? Ohms law stated that,the electric current in a given metallic conductor is proportional to the potential difference applied between its ends,provided that temperature and other physical factors remain constant. Explain the reason for the difference across the resistance box The drop in potential in the cell may be due to the internal resistance of the cell State two advantages of using a potentiometer over a volt meter for measuring potential difference i.it gives more accurate reading and no current passes as the reading is being taken ii.the range can be extended there by varying the sensitivity iii.the potentiometer can be used to avoid zero error explain why the e.m.f of a cell usually greater than the p.d across its terminals when the cell is used to supply current to an external circuit i. it is due to the volts lost as a result of the internal resistance of the cell what is potentiometer? it consist of a meter rule and a wire of known SWG same length as the meter rule with terminals at both ends === ========================= I WILL ADVISE YOU TO SUBSCRIBE FOR THE RUNZ NOW, COS THERE WILL NOT BE POSTING OF ANSWER PUBLICLY IN THIS SITE Click here to subscribe The remaininq Answer is ready and ment for only our sybscribers before exam Note- If you dont see the above Image very well change your opera mini browser size to Large or goto Upload section and click on Latest uploade and download it into your phone..... Click here to subscribe for 2014 waec answers - See more at: solutionguys.net/forum2_theme_110868932.xhtml?tema=44#sthash.njcUXF9o.dpuf
Posted on: Thu, 27 Mar 2014 14:17:11 +0000
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