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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...
Evan Toh
Nov 6, 20241 min read
Copper spheres P and Q, P has larger volume. What quantity is the same? 2020PP01q7
This question is very straight forward. As both P and Q are copper, the density will be the same. But many are unsure of KE. Let look at...
Evan Toh
Nov 4, 20241 min read
What happens to frequency and speed of water wave as it goes to shallow region? 2019PPp1q23
Once the wave is produced, the frequency remains constant. Hence speed V of the wave is directly proportional to the wavelength of the...
Evan Toh
Nov 4, 20241 min read
Evan Toh
Nov 4, 20241 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....
Evan Toh
Nov 4, 20241 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...
Evan Toh
Oct 30, 20241 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...
Evan Toh
Oct 25, 20241 min read
Evan Toh
Oct 25, 20241 min read
DC Question – Find unknown R, given the voltmeter readings when switch P and Q are closed respectively
Answer : Option A
Evan Toh
Oct 25, 20241 min read
Distance of sound detector from walls
Answer: Option B
Evan Toh
Oct 25, 20241 min read
Minimum distance h mirror from the floor
Answer: Option B
Evan Toh
Oct 24, 20241 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...
Evan Toh
Oct 24, 20241 min read
Converging Lens – Which ray is correct after passing through the lens
Which of the following light rays behaves correctly when it passes through the converging lens? Solutions: Option C Recall these basic...
Evan Toh
Oct 24, 20241 min read
Evan Toh
Oct 24, 20241 min read
2024 Specimen Paper 6091 P1 Q30 Filament bulb graphs
When comes to filament lamp, the non-ohmic characteristic properties comes to mind. But for this quesitons, you have to understand that...
Evan Toh
Oct 23, 20241 min read
2020PPp1q9 moments – Find force P acting on stick by shoulder
Using the concepts that POM, we know 1) Ma = Mc 2) net force on the stick is 0N. Most of us will most likely to take pivot about P as...
Evan Toh
Oct 23, 20241 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...
Evan Toh
Oct 22, 20241 min read
Minimum force F to push barrel up a step
Answer: Option D
Evan Toh
Oct 20, 20241 min read
Video 02 Finding resultant force from vector diagram provided
(1) 2003PPq1q7 (0 min to 2.42 min) Ans: Option A (2) 2023PPp1q4 (2.47 min 3.54 min) Ans: Option C (3) 2018PPp1q2 (3.45 min to 6.22 min)...
Evan Toh
Oct 20, 20241 min read
Video 01 How to find resultant force of two or three forces (without drawing vector diagram)
Below are some examples of questions that involve finding the resultant force due to two or three forces. Below are the questions in the...
Evan Toh
Oct 20, 20241 min read
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