Evan Toh
Radioactivity - Questions on Penetrating Ability and Applications
2002PPQ38, 2003PPQ38, 2005PPQ37, 2006PPQ38, 2007PPQ39 Answer: Option B Answer: Option D Answer: Option B Answer: Option C Answer: Option...
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Evan Toh
7 days ago1 min read
Radioactivity - Questions on mass number and proton number of the nucleus after decay
2005SPQ20, 2006PPQ40, 2005PPQ38, 2003PPQ39 Answer: Option A Answer: Option D Answer: Option B Answer: Option C Answer: Option B Answer:...
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Evan Toh
Nov 61 min read
Radioactivity - Questions on emissions through electric and magnetic field
Alpha particle is a helium nucleus which is positive charged . Beta particle is an electron which is negative charged . Gamma ray has...
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Evan Toh
Nov 60 min read
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Evan Toh
Nov 61 min read
Radioactivity - Questions on Half-life
Half-life of a radioactive nuclide is the time taken for half the nuclei of that nuclide in any sample to decay . (time taken for the...
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Evan Toh
Nov 41 min read
What is the resistance of Y when its length is doubled and diameter three times larger? 2018PPp1q31
When question states that radius or diameter is increased by 3 times, that note that cross-sectional area does not increase by 3 times....
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Evan Toh
Nov 30 min read
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Evan Toh
Nov 21 min read
How to mark 2 points (at a distance apart) at the same level? (water finds its own level)
The video below demonstrates that water will find its own level. An question requires this concept: An apartment block receives water...
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Evan Toh
Oct 301 min read
PP2022P1Q17 Why is the athlete wrapped with silver and white sheet after a run?
We have learned that silver smooth reflective surface is a poor absorber , poor emitter or a good reflector of infra-red radiation. How...
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Evan Toh
Oct 251 min read
2007PPp1q28 2019PPp1q33 - Which V-I readings are for torch lamp?
2019PPP1Q33 Ans: Option B 2007PPP1Q28 Ans: Option B Torch lamp or bulb is a non-ohmic conductor . The V-I graph has an increasing...
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Evan Toh
Oct 251 min read
Various lens experiments
The video below shows a typical lens experiment. (reference to O-Level SciPhy 2015). I will briefly go through the set-up, main steps and...
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Evan Toh
Oct 241 min read
Different Converging Lens Ray Diagram questions
Drawing ray diagrams for converging lens come in many forms. But the basic concepts needed are the 3 rays (which have rules to follow) to...
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Evan Toh
Oct 241 min read
Object is released and free-falling. Time taken to fall vertically from P to Q?
Keep in mind that you can utilize the two main concepts of a speed-time graph. As object is under free-fall, the acceleration (the...
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Evan Toh
Oct 231 min read
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Evan Toh
Oct 231 min read
Displacement-time and Velocity-time Graph of Ball Thrown Up / Ball Dropped
1) When a ball is thrown up and it comes down When the ball leaves the hand, there is no upward force acting on the ball. The only force...
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Evan Toh
Oct 221 min read
2016PPP1Q40 – Voltage and Power of Bulb Y when X is switched off - 2013PPP1Q40 heaters
2016PPP1Q40 Solutions: Option C [There is another similar question in 2013 Nov Pure Physics P1Q40. The answer is Option C too. Refer to...
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Evan Toh
Oct 211 min read
Using P = I^2R and P = V^2/R to explain which component uses the highest power or energy.
Instead of P = IV to explain, it might be easier to explain using P = I^2R when the components are connected in series where current I is...
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