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Evan Toh
Dec 13, 20240 min read
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Evan Toh
Dec 13, 20240 min read
64 views
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Evan Toh
Dec 12, 20240 min read
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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...
Evan Toh
Nov 7, 20241 min read
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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
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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
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Evan Toh
Nov 4, 20241 min read
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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
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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 22, 20241 min read
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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
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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...
Evan Toh
Oct 21, 20241 min read
57 views
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When a thermistor is connected in series with a fixed resistor, how to explain the p.d. varies as resistance temperature changes?
When two components are connected in series, where one is a fixed resistor and the resistance of the other can vary (e.g. thermistor,...
Evan Toh
Oct 21, 20241 min read
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Evan Toh
Oct 21, 20240 min read
2 views
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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
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Direction of Frictional Force on Tyre or Wheel
For these type of questions, it is important to identify which tyre/wheel is connected/powered by the engine or the person. On each tyre...
Evan Toh
Oct 16, 20241 min read
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2012PPp2q07 - Find the p.d. across A and C
Instead of the usual finding of potential difference across a component, in this question, you are required to find the p.d. across two...
Evan Toh
Oct 15, 20241 min read
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PP2017Q11 Using P=I^2R and P=V^2/R to explain which has higher power
Resistors may be connected in series or parallel. When asked which resistor has higher power (hence higher energy), in general we will...
Evan Toh
Jan 31, 20241 min read
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2013PPP1Q30 – Direction of the electric field around a negative charge
Ans: Option A View the video tutorial for the explanation:
Evan Toh
Jan 31, 20241 min read
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PP N2010 P1 Q4 Two objects same size and shape but one is heavier. Motion when both released
Solutions: Option C When a body is released from rest, the only force acting on the body is its weight due to gravity . Both bodies...
Evan Toh
Dec 31, 20231 min read
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Identifying what lens, focal length and image from 2 rays – PP2010P1Q23 and SP2014P1Q11
These 2 questions are actually the same. Q23 is from 2010 Pure Physics P1 while Q11 is from 2014 Sci Physics P1. Take a look at these 2...
Evan Toh
Dec 31, 20231 min read
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