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2015 PurePhy P1Q6 – Using Newton’s 3rd Law to find Forward Thrust
Refer to this MCQ from PurePhysics 2015P1Q6 Answer: Option C
Evan Toh
Oct 16, 20241 min read


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


2021PPp1q36 DC circuit, which circuit has a potential difference between P and Q
Do you understand why there is a potential difference between P and Q? What if you are to find the potential difference between P and Q?...
Evan Toh
Oct 15, 20241 min read


Finding focal length f of the lens using pin and mirror or sharp image from distance object
A thin convex lens is placed on a plane mirror and an object pin is then moved along the axis of the lens until an image is seen to...
Evan Toh
Oct 1, 20242 min read


2013PPP1Q30 – Direction of the electric field around a negative charge
Ans: Option A View the video tutorial for the explanation:
Evan Toh
Feb 1, 20241 min read


Ticker Tape Timer
Ticker tape timer is a device which punches dots on a tape at specific time interval. The tape can be attached to a moving object. With...
Evan Toh
Jan 1, 20241 min read


2010SPp1q12 Lens - focal length definition
Answer: Option C Focal length f is the distance between the focal point and the centre of the lens (optical centre) . Note that only...
Evan Toh
Jan 1, 20241 min read


2008PPp1q15,2017PPp1q15– Pressure constant, rate of collision decreases
When gas in piston and heated but pressure remains constant. It is easier to explain in terms of the average force acting on a unit area....
Evan Toh
Jan 1, 20242 min read


Pressure – Height of ethanol in the column
Answer: Option D
Evan Toh
Jan 1, 20241 min read


2 pistons of different pressure joined together - P1V1 = P2V2
Solution: Option C
Evan Toh
Jan 1, 20241 min read


Which is a possible displacement-time graph for particle Y?
Answer: Option D
Evan Toh
Jan 1, 20241 min read


Unusual Behaviour of Less Dense Balloon in Air or Water
Answer: Option A Of course if a heavy ball is suspended from the car we all know the ball will move in opposite direction of a...
Evan Toh
Jan 1, 20241 min read


2021SPP1Q15 Electric field lines between the two charges
Answer: Option D View the video tutorial for the explanation
Evan Toh
Jan 1, 20241 min read


SP N2007 P1 Q16 – Which events will cause the fuse to blow?
An electric cable contains three wires live, neutral and earth. The cable is correctly wired to a plug which contains a 3A fuse. The...
Evan Toh
Jan 1, 20242 min read


Evan Toh
Jan 1, 20241 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. PAVA = PBVB (Patm + Pwater) VA =...
Evan Toh
Jan 1, 20241 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...
Evan Toh
Jan 1, 20241 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...
Evan Toh
Jan 1, 20241 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...
Evan Toh
Jan 1, 20241 min read


Barometer with a layer of water – Find height of mercury H
Answer: Option B
Evan Toh
Jan 1, 20241 min read
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