Evan Toh
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Evan Toh
Dec 31, 20231 min read
When to use the concept PV = constant and P1V1 = P2V2 to solve?
When temperature is constant (for o-level), when a fixed mass of gas (fixed number of air molecules) is compressed in a closed system...
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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
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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Evan Toh
Nov 30, 20231 min read
Kinematics – Two balls free-fall with different mass and height
Solutions: Option B Key concepts: Both balls are free-falling, hence both will experience the same acceleration due to gravity 10 m/s2.
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Evan Toh
Nov 30, 20231 min read
N2007P1Q9 Pure Physics – Energy needed to pump water up a building
Answer: Option B Since water will naturally reach 40m high from the bottom of the apartment, you only need to pump the water up by a...
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Evan Toh
Nov 30, 20231 min read
Kinematics – Swimmer in river with current, find distance downstream
Solutions: Option B Without the current in the river, the time taken for the swimmer to reach Q is 50s. This is based on the vertical...
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Evan Toh
Nov 30, 20231 min read
Kinematics Question – Using gradient and area under graph
Solutions: Option B
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Evan Toh
Nov 30, 20231 min read
Relationship between Pressure and Length of a Cube
Answer: Option A
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