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Evan Toh
Dec 31, 20231 min read
2004PPp1q15 - Volume of bubble at bottom of lake (P1V1 = P2V2)
Answer: Option A Since the air bubble is enclosed, PV at A is equal to PV at B. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â PAVA = PBVB (Patm + Pwater) VA =...
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Evan Toh
Dec 31, 20231 min read
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...
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Evan Toh
Dec 31, 20231 min read
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...
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Evan Toh
Dec 31, 20231 min read
Where is the focal point of lens L1 and L2?
Answer: Option A Refer to the diagram (below left) which many are familiar. When parallel rays of light which are parallel to the...
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Evan Toh
Dec 31, 20231 min read
Barometer with a layer of water – Find height of mercury H
Answer: Option B
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Evan Toh
Dec 31, 20231 min read
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Evan Toh
Dec 31, 20231 min read
Determine the motion of the particles on transverse wave
Instead of imaging how the particles will move and guess their motion, there is a technique which can help you to determine that. In...
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Evan Toh
Dec 31, 20231 min read
2013SPp1q17 What is the new P when V across resistor is doubled? Similar 2018PPp1q31
Answer: Option C View the videos below to learn how to solve it. There are more than one method. Alternatively, you may put values to...
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Evan Toh
Dec 31, 20231 min read
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Evan Toh
Dec 31, 20231 min read
Lens, screen and mirror – what kind of image formed on screen
Answer: Option C
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Evan Toh
Dec 31, 20231 min read
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Evan Toh
Dec 31, 20231 min read
Using barometer to estimate height of mountain
At sea-level, the barometer which Pie is holding reads 760 mm of Hg. When he is at the top of Mount Pie, the same barometer reads 230 mm...
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Evan Toh
Dec 31, 20231 min read
Time interval between two sounds from a gun – direct and reflected sound
Solutions: Option B You can view the video tutorial here or the written solutions below.
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Evan Toh
Nov 30, 20231 min read
What is the current in wire OP? Is it flowing from O to P or P to O?
Solutions: Option B Whatever that goes in has to come out. With this basic concept, you will be able to solve this question easily....
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Evan Toh
Nov 30, 20231 min read
Finding specific latent heat of vaporisation (lv) (pure physics)
Take note that the question is looking for specific latent heat of vaporisation during boiling. Hence information of mass m1 before...
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Evan Toh
Nov 30, 20231 min read
2007PPP1Q27 brightness of bulb
Solutions: Option B As lamp X is thicker and shorter , these two factors make the resistance of X lower than Y . Recall: Length...
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Evan Toh
Nov 30, 20231 min read
Resultant force-time graph link to speed-time graph
Answer: Option A Refer to the video tutorial below for explanation.
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Evan Toh
Nov 30, 20231 min read
Finding effective resistance when a wire is bent into different shapes
The concepts needed to solve such questions Length increases, resistance increases and vice versa. Finding resistors in parallel and in...
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Evan Toh
Nov 30, 20231 min read
Which 2 junctions to connect to ahieve greatest resistance?
Based on individual calculations, the highest effective resistance will only be achieved if the junctions are connected at Q and S.
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Evan Toh
Nov 30, 20230 min read
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