So have a look in here, got some predictions...
TO BE NOTED : THESE ARE ONLY PREDICTIONS, PLEASE DO NOT RELY ON IT 100%. DO SO AT YOUR OWN RISK.
First you can get the electricity question, big one. You will have to setup a circuit with a power supply, ammeter, voltmeter, semi-conductor diode, LED/Resistor and dip the diode in cold water or ice cubes. You will need to measure the temperature with a thermometer before starting to take readings. You will need to vary the voltage and take 5 or 6 readings from the ammeter and voltmeter, draw a table and plot a graph etc.
For the second question, it will be regarding the terminal velocity of two beads when they are dropped in a cylinder filled with oil. You will need to measure the diameters of the beads with a Micrometer Screw Gauge, so do learn how to use it. Next you will need to drop the beads one by one and note the time it took for the beads to travel a certain distance. You will need to measure this distance with a meter rule. Then error and improvements etc.
The schools/centers are not that rich to provide you with a digital one? Why would they teach us how to read off the values from a manual one in O Level and AS Level if they wanted to hand us the digital ones?
Thus, I suggest you learn how to use both vernier calipers and micrometer screw gauge and forget about it being a digital one!
Just stay focused, try to do the first experiment within one hour, take the 6 readings ASAP so that you can even come back to do the first question after finishing the second small/not so lengthy question. Yes you will be able to come back after you are done with the second question and finish the first one. You just won't have the equipment anymore. So you have 2 hours to do 2 questions, use the time wisely!
Another thing, you will need to keep the temperature constant, but don't try to take temperature readings more than two times, it's waste of time. Just do it once in the beginning and note it, then in the middle of the experiment read it again. The temperature should remain almost constant, but try to take the readings ASAP and turn off the power supply each time you have taken the reading. That's because at higher voltages, you will start to hear crackling noises from the water, but don't be alarmed and take the reading quickly and turn the power supply off.
