Quick Revision

Orders of magnitude of sizes of common objects ranging from a typical atom to the Earth

Evan Toh

Dec 90 min read

Orders of magnitude of sizes of common objects ranging from a typical atom to the Earth

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Radioactivity - Questions on Penetrating Ability and Applications

Evan Toh

Nov 71 min read

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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Radioactivity - Questions on mass number and proton number of the nucleus after decay

Evan Toh

Nov 71 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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Radioactivity - Questions on emissions through electric and magnetic field

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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Radioactivity - Which statements is not true about alpha particle? Is alpha particle radioactive? 2001PPp1q35

Evan Toh

Nov 60 min read

Radioactivity - Which statements is not true about alpha particle? Is alpha particle radioactive? 2001PPp1q35

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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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What is the resistance of Y when its length is doubled and diameter three times larger? 2018PPp1q31

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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Electrostatic application - BMW paint Spraying

Evan Toh

Nov 40 min read

Electrostatic application - BMW paint Spraying

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Applying FLHR: different 2D views from a 3D diagrams

Evan Toh

Nov 30 min read

Applying FLHR: different 2D views from a 3D diagrams

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Input Transducers - Light dependent resistor (LDR) and thermistor

Evan Toh

Nov 30 min read

Input Transducers - Light dependent resistor (LDR) and thermistor

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Evan Toh

Nov 30 min read

Potential Divider / Potentiometer

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How to mark 2 points (at a distance apart) at the same level? (water finds its own level)

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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PP2022P1Q17 Why is the athlete wrapped with silver and white sheet after a run?

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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2007PPp1q28 2019PPp1q33 - Which V-I readings are for torch lamp?

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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Different Converging Lens Ray Diagram questions

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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Object is released and free-falling. Time taken to fall vertically from P to Q?

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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Energy - Ratio of KE to GPE at 10m when an object is released from 50m

Evan Toh

Oct 231 min read

Energy - Ratio of KE to GPE at 10m when an object is released from 50m

Ans: Option C

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Displacement-time and Velocity-time Graph of Ball Thrown Up / Ball Dropped

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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2016PPP1Q40 – Voltage and Power of Bulb Y when X is switched off - 2013PPP1Q40 heaters

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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